Evaluation of Employee Training Demand Essay Example | Topics and Well Written Essays - 2000 words

Evaluation of Employee Training Demand - Essay Example This process is the research problem source between employee and corporation performance. After this process judgment is made whether training can actually assist in solving the problem or not. What kind of training is required is also determined. In order to evaluate and make the judgment if the employee training will assist in solving the problem or not, a number of training and non-training elements need to be considered. The training factors that should be considered include: In this aspect it is important to determine if there is a real need for training or not. This need may arise from the decreasing organizational profits, decreased productivity, increase in the costs and ineffective operations of the organizations due to the lack of proper skills and non-performance of efficient practices by the employees. In this facet of evaluating employee training demand, you need to determine that if the training is needed, why it is needed. The possible reasons can be the changing global trends according to which the skills of the employees need to be polished, it can be a legal requirement, a customer need etc. Here you determine what kind of skills training is required. ... Therefore it is important to determine what core competency needs to be improved. Which employees need training It is also important to know that which employees need what training. This is because employees in different departments need different kind of skill sets and their knowledge and learning requirements are entirely different. For example, it may be necessary for the purchase department people to have the negotiating skills training while it may not be important for the quality control department employees. How and where will the training take place During the evaluation of employee training demand it is also important to know that how will the training take place, i.e. determining will the training sessions be conducted in the office timings or not, will the trainers be hired from within the company or not, will the training sessions be conducted in the office premises or not, etc. The evaluation of training demand should also include some non-training elements, such as organization structure, work environment, salary system and etc. as they have a strong influence on the corporation's conditions. These elements are discussed below: Organizational Structure: Organizations with hierarchical structures are more prone to redundancy of work assignments. Therefore there is usually there is less need for the training of all the employees in such organizations. However in flatter structured organizations, a single employee should have a broad skill set and therefore most of the employees in such organizations have a high demand for training. Organizational Work Environment: The work environment and the working conditions of the organization also are an

Fences by Augusta Wilson Essay Example | Topics and Well Written Essays - 250 words

Fences by Augusta Wilson - Essay Example All The other characters in the play are closely related to the protagonist. The conflicts arises in the play are due to his self illusion and philosophy. He is a person living between two contradictory ideas like that of his name ‘Maxon’ a fusion of Mason and Dixon. To some extend we feel that he is an unsympathetic character. The illegal relation with Alberta visibly shows that he is a hypocrite. He was insisting others to be perfect in their life, but he was not so. At the same time he enjoys the freedom of choice. Troy never learned how to treat people close to him and he never gave any one a chance to prove themselves because he was selfish. Troy’s relationship with his son ‘Cory’ reveals the essential quality of a tragic hero, i.e. doing whatever they think right. Troy never allows his son to play football claiming that he doesn’t want Cory to suffer like him. He says â€Å"The white man are not gonna let you get nowhere with that footba ll no way† Cory accuses his father and says ‘you just scared I’m gonna be better than you, that’s all â€Å".

The two junctions Essay Example for Free

The two junctions Essay A thermocouple is a pair of different metals, which produces a thermoelectric effect (e. m. f. ), which is used to sense and measure a difference in temperature. A thermocouple consists of two different metal wires joined together. When there is a temperature difference between the two junctions, a thermoelectric emf is produced. A thermocouple is a source of a temperature dependent emf that can be used to monitor or measure temperatures. When two different metals are connected together, electrons leave one metal and transfer to the other metal, causing a potential difference across the two junctions. This is known as the Seebeck effect. This potential difference occurs because electrons can leave one of the metals more easily than the other so the first metal looses the electrons to become positive and the second metal gains electrons to become negative. If both junctions are at the same temperature, it causes an equal but opposite potential difference at the other junction. If the junctions are at different temperatures, then the potential difference across them can differ, giving rise to a net emf around the circuit. This is what is called as the thermoelectric effect. The metals must be different and for a given temperature, the emf depends on the choice of the two metals. The potential difference is small, of the order of a few millivolts or less. However, the resistance of a thermocouple is generally small. So despite the small potential difference, it will give a measurable current. A problem with working with thermocouples is that it needs a sensitive voltmeter, able to detect a signal of the order of a thousandth of a volt. Too sensitive a detector, and there appears to be no temperature difference. Another problem is the problem of internal resistance of a source. If the thermocouple is connected to a low resistance detector, the potential difference across it may be tiny, because most of the potential difference available is used up in driving a small current through the large internal resistance. Only if the detector has itself a very high resistance is there an appreciable potential difference seen as the output of the sensor. A thermocouple thermometer can be made using two similar wires and a different wire connected together to form two junctions acting in opposition to each other. The free end of each similar wire is connected to a microvoltmeter or to a d.c. Amplifier with a voltmeter connected at its output. One of the junctions is maintained at a constant temperature and the other junction is used as a temperature prob. The meter reading changes according to the difference between the temperature of the probe and the reference junction. The probe is simply a junction between two thin wires and this makes it respond rapidly to change of temperature and has therefore a faster response time in liquid glass thermometer. In addition, because a thermocouple generates an emf directly, it is used widely in control systems.

The Drill Stem Component Description Engineering Essay

The Drill Stem Component Description Engineering Essay CHAPTER 3 INTRODUCTION This chapter presents general procedures for drill string design. The design aspects of critical importance and factors controlling drill pipe selection are highlighted. The term Drill Stem is used to refer to the combination of tubulars and accessories that serve as a connection between the rig and the drill bit (RGU lecture slides). It consists mainly of Drill Pipe, Drill Collars (DC) and Heavy Weight Drill Pipes (HWDP) and accessories including bit subs, top drive subs, stabilisers, jars, reamers etc. Drill stem is often used interchangeably with the term Drill String which actually refers to the joints of drill pipe in the drill stem. For the purpose of this report, Drill String will be used to refer to the string of drill pipes that together with drill collars and heavy weight drill pipe make up the drill stem see fig 3.1. 3.1 DRILL STEM COMPONENT DESCRIPTION 3.1.1 Drill Pipe The drill pipes are seamless pipes usually made from different steel grades to different diameters, weights and lengths. They are used to transfer rotary torque and drilling fluid from the rig to the bottom hole assembly (drill collars plus accessories) and drill bit. Each drill pipe is referred to as a joint, with each joint consisting of a pipe body and two connections (see fig 3.2). Drill pipe lengths vary, and these different lengths are classified as ranges, the available or more common ranges include: Range 1: 18 22 ft Range 2: 27 30ft Range 3: 38 40ft. Drill Stem. Fig 3.1: Drill Stem with components. (Heriott Watt University lecture Notes: Drilling Engineering) Drill pipes are also manufactured in different sizes and weights which reflects the wall thickness of the drill pipe. Some common sizes and their corresponding weights include 31/2 in. 13.30 lb/ft and 4 1/2in. 16.60 lb/ft. The indicated weight is the nominal weight in air (pipe body weight excluding tool joints) of the drill pipe. A complete listing of API recognised drill pipe sizes, weight and grades are published in the API RP 7G. The drill pipe grade is an indication of the minimum yield strength of the drill pipe which controls the burst, collapse and tensile load capacity of the drill pipe. The common drill pipe grades are presented in the table below Grade Yield Strength, psi Letter Designation Alternate Designation D D-55 55,000 E E-75 75,000 X X-95 95,000 G G-105 105,000 S S-135 135,000 Table 3.1: Drill Pipe Grades. Drill pipes are often used to drill more than one well, therefore in most cases the drill pipe would be in a worn condition resulting in its wall thickness being less than it was when the drill pipe was brand new. In order to identify and differentiate drill pipes, they are grouped into classes. The different classes are an indication of the degree of wear on the wall thickness of the drill pipe. The classes can be summarised as follows according to API standards: New: Never been used, with wall thickness when to 12.5% below nominal. Premium: Uniform wear with minimum wall thickness of 80%. Class 2: Allows drill pipe with a minimum wall thickness of 70%. It is essential that the drill pipe class be identified in drill pipe use or design, since the extent of wear affects the drill pipe properties and strength. When specifying a particular joint of drill pipe, the class, grade, size, weight and range have to be identified, the specification could therefore appear thus: 5 19.5 lb/ft Grade S Range 2 Fig 3.2: Parts of Drill pipe. (Handbook for Petroleum and Natural gas) 3.1.2 Tool Joints Tools joints are screw type connections welded at the ends of each joint of a drillpipe. The tool joints have coarse tapered threads and sealing shoulders designed to withstand the weight of the drill string when it is suspended in the slips. Tool joints are of two kinds; the pin (male section) and the box (female section). Each drill pipe has a pin attached to one end and a box attached at the other end. This makes it possible for the pin of one joint of drill pipe to be stabbed into box of a previous drill pipe. There are several kinds of tool joints widely used: Joint Type Diagram Description Internal Upset (IU) Tool joint is less than the pipe. Tool joint OD is approximately the same as the pipe. Internal Flush (IF) Tool joints ID is approximately the same as the pipe. The OD is upset. Internal / External Upset (IEU) Tool joint is larger than the pipe such that the tool joint ID is less than the drill pipe. The tool joint OD is larger than the drill pipe. Table 3.2 Types of tool joints. (The Robert Gordon University Lecture Notes: Drill String Design) 3.1.3 Drill Collars Drill collars are thick walled tubes made from steel. They are normally the predominant part of the bottom hole assembly (BHA) which provides Weight on Bit (WOB). Due to the large wall thickness of the drill collars, the connection threads could be machined directly to the body of the tube, thereby eliminating the need for tool joints (see fig 3.3). Drill collars are manufactured in different sizes and shapes including round, square, triangular and spiral grooved. The slick and spiral grooved drill collars are the most common shapes used currently in the industry. There are drill collars made from non-magnetic steel used to isolate directional survey instruments from magnetic interference arising from other drill stem components. The steel grade used in the manufacture of drill collars can be much lower than those used in drill pipes since they are thick walled. Functions Provide weight on bit Provide stiffness for BHA to maintain directional control and minimise bit stability problems. Provide strength to function in compression and prevent buckling of drill pipes. Fig 3.3: Carbon Steel Drill Pipes. 3.1.4 Heavy Weight Drill Pipe Heavy weight drill pipes (HWDP) are often manufactured by machining down drill collars See fig 3.4. They usually have greater wall thickness than regular drill pipe. HWDP are used to provide a gradual cross over when making transition between drill collars and drill pipes to minimise stress concentration at the base of the drill pipe. These stress concentrations often result from: Difference in stiffness due to the difference in cross-sectional area between the drill collar and drill pipe. Bit bouncing arising from rotation and cutting action of the bit. HWDP can be used in either compressive or tensile service. In vertical wellbores it is used for transition and in highly deviated wells, it used in compression to provide weight on bit. Fig 3.4: Heavy Weight Drill Pipe. (Heriott Watt University lecture Notes: Drilling Engineering) 3.1.5 Accessories Drill Stem accessories include: Stabilisers: these are made of a length of pipe with blades on the external surface. The blades are spiral or straight, fixed or mounted on rubber sleeves to allow the drill string rotate inside. Functions of the stabiliser include: Stabilise the drill collars to reduce buckling and bending Ensure uniform loading of tricone bits to reduce wobbling and increase bit life. To provide necessary wall contact and stiffness behind the bit to induce positive side force to build angle when drilling deviated wells. Reamers: used in the BHA to enlarge the well bore diameter and ream out doglegs, key seats, ledges. Drilling Jars: incorporated in the BHA to deliver a sharp blow and assist in freeing the drill string should it become stuck. 3.2 DRILL STRING DESIGN The drill string design is carried out in order to establish the most efficient combination of drill pipe size, weight, and grades to fulfil the drilling objectives of any particular hole section at the lowest cost within acceptable safety standards. In order to design a drill string to be used in a particular hole section, the following parameters need to be established: Hole section depth Hole section size Expected mud weight Desired safety factors in tension and overpull. Desired safety factor in collapse Length of drill collars required to provide desired WOB including OD, ID and weight per foot. Drill pipe sizes and inspection class The drill string design has to meet the following requirement: The working loads (tension, collapse, burst) on the drill string must not exceed the rated load capacity of each of the drill pipes. The drill collars should be of sufficient length to provide all required WOB to prevent buckling loads on the drill pipe. The drill pipes used have to ensure the availability of sufficient fluid flow rate at the drill bit for hole cleaning and good rate of penetration. 3.2.1 Design Safety Factors Design safety factors are applied to calculated working loads to account for any unexpected service load on the drill string. They are used to represent any features that are not considered in the load calculations e.g. temperature and corrosion, thus ensuring that service loads do not exceed the load capacity of the drill pipe. Design safety factor values are often selected based on experience from operating within a particular area, the extent of uncertainty in the operating conditions e.g. when operating in HPHT conditions, a larger safety factor is applied than when operating in less harsh conditions. Some commonly used design safety values are illustrated in the table below Load Design Safety Factor Value Tension 1.1 1.3 Margin of overpull (MOP) 50,000 100,000. MOP of 400,000 have been used in ultra deep wells Weight on Bit 1.15 or 85% of available Weight on bit to ensure neutral point is 85% of drill collar string length measures from the bottom (API RP 7G) Torsion 1.0 (based on the lesser of the pipe body or tool joint strength) Collapse 1.1 1.15 Burst 1.2 3.2.2 Drill Collar Selection The drill collars are selected with the aim of ensuring that they provide sufficient WOB without buckling or putting the lower section of the drill string in compression. 3.2.2.1 Size selection Lateral movement of the drill bit is controlled by the diameter of the drill collar directly behind it. Therefore the size/diameter of the drill collar closest to the bit will be dependent on the required effective minimum hole diameter and the relationship can be given as When two BHA components of different cross-sectional areas are to be made up, it is essential that the bending resistance ratio (BRR) be evaluated. This is important because BHA components have tensile and compressive forces acting on them when they are bent in the well bore. These forces cause stress at connections and any location where there is a change in cross-sectional area. Therefore it is important to ensure that these stresses are within acceptable ranges. The bending resistance (BR) of a drill string component is dependent on its section modulus which is given as Z = section modulus, in3 I = second moment of area, in4 OD = outside diameter, in ID = inside diameter, in The BRR is used to express any change in BR and can be calculated using BRR should generally be below 5.5 and in severe drilling conditions, below 3.5. 3.2.2.2 Connections When selecting connections to be used with drill collars, it is essential to check that the BRR of the pin and box indicates a balanced connection. The BRR for drill collar connection is calculated as the section modulus of the box divided by the section modulus of the pin. The API RP 7G contains tables that can be used to determine BRR for any box and pin OD. BRRs of 2.5 have given balanced connections (RGU Lecture notes, 2005). 3.2.2.3 Weight on Bit The maximum weight on bit required is normally a function of the bit size and type. The rule of thumb is: Maximum WOB of 2000lbf per inch of bit diameter when using Polycrsyalline Diamond Compact bits (PDC) and mud motors. Maximum WOB of 5000lbf per inch of bit diameter when using tricone bits. Other factors controlling WOB include inclination, hole size and buckling. In vertical wellbores the length of drill collars required to provide a specified weight on bit is given by LDC = Length of Drill Collars, ft WOB = Weight of Bit, lb DFBHA = Safety factor to keep neutral point in drill collars. WDC = Weight per foot of Drill Collars, lb/ft Kb = Buoyancy Factor. The neutral point as described by (Mian, 1991) referring to Lubinksi, is the point that divides the drill stem into two portions, with the section above the neutral point in tension and that below in compression. Therefore in order to ensure that the entire length of drill pipes remain in tension, the neutral point of the drill stem has to be maintained within the drill collars. According to the API RP 7G, the height of the neutral point measured from the bottom of the drill collars will be 85% of the total length of drill collars used, with 85% being the safety factor. In inclined wellbores, the angle of inclination has to be taken into consideration when calculating the maximum WOB that can be applied without buckling the drill pipe. This is because although the WOB is applied at the inclination of the wellbore, this weight acts vertically, thus reducing the available weight at the bit. Therefore to allow for this reduction, the buoyed weight of the BHA would be reduced by the cosine of the well inclination, thus WOB in inclined holes is calculated with the formula All parameters remain as defined in equation 5; ÃŽÂ ¸ is the angle of inclination of the well. As a result of the vertically acting weight of the BHA, the drill string tends to lie on the low side of the hole and is supported to some extent by the wall of the well bore. Therefore the pipes above the neutral point could only buckle if the compressive forces in the drill string exceed a critical amount. This critical buckling force is calculated as follows Fcrit = critical buckling force, lb ODHWDP = outside diameter of HWDP, in. ODtj = maximum outside diameter of pipe, in. IDHWDP = inside diameter of HWDP, in. Kb = buoyancy factor. Dhole = diameter of hole, in. ÃŽËÅ" = hole inclination, degrees. Since HWDP are sometimes used to apply WOB in inclined wells, and drill pipes are sometimes used in compression, the critical buckling force is calculated for both HWDP and drill pipes. 3.2.3 Drill Pipe Selection Factors to be considered for drill pipe selection include: Maximum allowable working loads in tension, collapse, burst, and torsion. Maximum allowable dogleg severity at any depth in order to avoid fatigue damage in the drill pipe. Combined loads on the drill pipe. The loads considered when selecting drill pipes to be used in the drill string is dependent on the well depth, well bore geometry and hole section objectives. In shallower vertical wells, collapse and tension are of more importance than burst or torsion. Burst is normally not considered in most designs since the worst case for a burst load on the drill pipe would occur when pressuring the drillstring with a blocked bit nozzle, even with this condition, the burst resistance of the drill pipe is likely to be exceeded. Torsion is of less importance in vertical well bores because drag forces are at minimal amounts unlike in highly deviated wells. The dogleg severity of the well for both vertical and deviated wells is important because of increased fatigue in the drill pipe when it is rotated in the curved sections of the wellbore. A graphical method is recommended for drill pipe selection, with the loads plotted on a load versus depth graph. This makes it possible for loads at particular points on the drill string to be easily visualised, and any sections of the drill pipe that do not meet the load requirements are easily identified and redesigned. 3.2.3.1 Collapse Drill pipes are sometimes exposed to external pressures which exceed its internal pressures, thereby inducing a collapse load on the drill pipe. The worst scenario for collapse in a drill pipe is during drill stem tests when they are run completely empty into the wellbore. The collapse loads are highest at the bottom joint of the drill pipes, as a result, the collapse load would normally control the drill pipe grade to be used at the bottom of the drill string. The API specified collapse resistance for different sizes and grades of drill pipe assuming either elastic, plastic or transition collapse depending on their diameter to wall thickness ratio have been calculated and are published in the API RP 7G with the relevant formulae. The maximum collapse pressure on the drill pipe when it is completely empty can be calculated as follows: Pc = collapse pressure, psi MW = mud weight, ppg TVD = true vertical depth at which Pc acts, ft. On some occasions, the mud weight outside the pipe varies from that inside the pipe, also the fluid levels inside and outside the pipe may also vary. This situation could also induce collapse loads. The collapse loads induced by this scenario can be calculated thus L = Fluid depth outside the drill pipe, ft MW = Mud weight outside the drill pipe, ppg Y = fluid depth inside drill pipe, ft MW = Mud weight inside drill pipe, ppg. The value for Pc is then plotted on the collapse load graph as the collapse load line see fig 3.5. It is recommended practice to apply a design safety factor to the collapse load calculated from equations 8 or 9 (depending on expected scenarios) in order to account for unexpected additional loads as wells as unknown variables. The value of the design factor is often between 1.1 1.5 for class 2 drill pipes. According to (Adams, 1985) the design factor should be 1.3 to account for the fact that new drill pipes are often not used for drill stem tests. The value of the collapse load multiplied by the collapse design factor is plotted on the collapse load graph as the design line, this is then used to select an appropriate grade and weight of drill pipe to fulfil these load conditions. Fig 3.5: Sample Collapse load graph. 3.2.3.2 Tension Load The tensile load capacity of the drill string should be evaluated to ensure there is enough tensile strength in the topmost joint of each size, weight, grade and class of to support the weight of the drill string submerged in the wellbore, hence the need to include buoyancy in the calculations. There has to also be enough reserve tensile strength to pull the drill string out of the well if the pipe gets stuck. The stabiliser and bit weight can be neglected when calculating the drillstring weight. In a vertical wellbore, the forces acting on the drill string are tension from its self weight and the hydrostatic pressure from the fluid in the wellbore. The hydrostatic pressure in the wellbore exerts an upward force on the cross sectional area of the drill string, which is commonly referred to as buoyancy. Therefore the resulting tensile load on the drill string attached to drill collars, taking account of buoyancy is calculated as: FTEN = resultant tensile load on drill string, lb LDP = length of drill pipe, ft LDC = length of drill collars, ft WTDP = air weight of drill pipe, lb/ft WTDC = air weight of drill collars, lb/ft MW = Mud weight, ppg. ADC = Cross sectional area of drill collars, in2 FTEN is plotted on the tension load graph as the tensile load line. The tensile strength values for different sizes, grades and inspection classes of drill pipes are contained in the API RP 7G, and can be calculated from the equation: Fyield = minimum tensile strength, lb Ym = specified minimum yield stress, psi A = cross section area, in2 Fyield is plotted as the minimum tensile strength line on the tension load graph. However, these values (Fyield) are theoretical values based on minimum areas, wall thickness and yield strength of the drill pipes. Therefore, these values only give an indication of the stress at which a certain total deformation would occur and not the specific point at which permanent deformation of the material begins. If a pipe is loaded to the minimum tensile strength calculated from equation 11, there is the possibility that some permanent stretch may occur, thereby making it difficult to keep the pipe straight in the wellbore. In order to eliminate the possibility of this occurrence, 90% of the minimum tensile strength as recommended by the API (American Petroleum Institute), should be used as the maximum allowable tensile load on the drill pipe, i.e Fdesign = maximum allowable tensile load 0.9 = a constant relating proportional limit to yield strength. Fdesign is plotted on the tension load graph as the maximum allowable tensile load line. As with the collapse load, a design factor would be applied to the tensile loads to account for dynamic loads in the drill pipe which occur when the slips are set, as well as prevent the occurrence of pipe parting close to the surface. The product of FTEN and the design factor is plotted as the tension design load line in the tension load graph see fig 3.6. Margin Of Overpull A margin for overpull is added to the tension load to ensure there is sufficient tensile strength in the drill pipe when it is pulled in the event of a stuck pipe. This margin is normally 50,000 100,000lb, but in deeper wells margins of overpull have reached 300,000lb. The value obtained after adding the margin of overpull is also plotted on the tension load graph see fig 3.6. The difference between the calculated tensile load at any point in the drillstring (FTEN) and the maximum allowable tension load would also represent the available overpull. This value represents available tensile strength of the drill pipe to withstand any extra forces applied to the drill string when trying to release it from a stuck pipe situation. FTEN and Fa can also be expressed as a safety factor This safety factor is an indication of how much the selected drill pipe will be able to withstand expected service loads. Due to uncertainty with actual service loads and conditions, a safety factor greater than 1 is always required. Slip Crush Slip crushing is generally not a problem if the slips are properly maintained. However, it is necessary to apply a safety factor for slip crushing when designing the drill string. This helps account for the hoop stress (SH) caused by the slips and the tensile stress (ST) caused by the weight of the drill string suspended in the slips. This relationship between SH and ST can be represented by the following equation SH = hoop stress, psi ST = tensile stress, psi D = outside diameter of the pipe, in. K = lateral load factor on slips, Ls = length of slips, in. = slip taper usually 9 ° 27 45 z = arctan ÃŽÂ ¼ ÃŽÂ ¼ = coefficient of friction, (approximately 0.08) The calculated tensile load is multiplied by the slip crush factor () to obtain the equivalent tensile load from slip crushing: Ts = tension from slip crushing, lb TL = tension load in drill string, lb SH / ST = slip crush factor. Ts is also plotted on the tension load graph as the slip crush design line. Fig 3.6: Sample Tension load graph The general step-by-step procedure for drill pipe selection using the graphical method is given as 1. Calculate the expected collapse load on drill pipe and apply the collapse design safety factor to derive the design load. Use the result to select weight and grade of drill pipe that satisfy collapse conditions. Plot expected collapse load and design load on a pressure vs. depth graph. 2. Calculate maximum allowable tensile load for the drill pipe selected in (1) above. Also calculate tension load on the drill string including buoyancy effects. Plot the tension load, specified minimum yield strength, and maximum allowable tensile load values on axial load vs. depth graph. 3. Apply tension design factor, margin of overpull, and slip crush factor to the calculated tension load and plot the individual results on the axial load vs. depth graph. Of the three factors applied to the tension load, the one resulting in the highest value is selected as the worst case for tensile loads. 4. Inspect graph and re-design any sections not meeting the load requirements. When designing a tapered drill string, the maximum length of a particular size, weight, grade and class of drill pipes that can be used to drill the selected hole section with specified WOB can be calculated as: All parameters remain as defined in equation 10 and 11. Note that equation 16 is only used when the MOP design line is the worst case scenario for tensile loads. When slip crushing is the worst case, the formula below is used SF = safety factor for slip crushing. The lightest available drill pipe grade should be used first in order to ensure that that the heavier grades are used upper section of the drill string where tensile loads are the highest. 3.2.4 Dog Leg Severity Fatigue damage is the most common type of drill pipe failure. It is known to be caused by cyclic bending loads induced in a drill pipe when it is rotated in the curved sections of the wellbore. The rotation of the drill pipe in the curved hole sections induce stresses in the outer wall of the drill pipe by stretching it and increasing its tensile loads. Fatigue damage from doglegs tends to occur when the angle exceeds a critical value. This critical value can be calculated as: C = maximum permissible dog leg severity, deg/100ft E = Youngs modulus, psi (30 x 106 for steel, 10.5 X 106 for aluminium) D = Drill pipe outer diameter, in. L = half the distance between tool joints, (180 in, for range 2 pipe) T = tension below the dogleg, lb à Ã†â€™b = maximum permissible bending stress, psi. I = drill pipe second moment of area, = à Ã†â€™b, is calculated from the buoyant tensile stress (à Ã†â€™t) and is dependent on the grade of the pipe. à Ã†â€™t = T/A, where T is defined in equation 19, and A is the cross sectional area of the pipe body in in2. For grade E pipe, The results from equation 20 are valid for à Ã†â€™t values up to 67,000psi. For grade S pipe, The results from equation 21 are valid for à Ã†â€™t values up to 133,400psi. It is recommended that an allowable dogleg severity (DLS) versus depth chart be plotted for every hole section with a particular drill string design since DLS changes with depth. The chart is plotted with the DLS on the x-axis and depth on the y-axis (see fig 3.7). When DLS lies to the left of the line or below the curve, the drill pipe is in safe operating conditions, and when it falls above or to the right of the curve, it is in unsafe conditions. Fig 3.7: Allowable Dogleg Severity Chart. (Mian, 1991) 3.2.5 Torsion Drill pipe torsional yield strength is important when planning deviated wells and ultra deep wells. In deviated wells, increased drag forces acting on the drill string from its interaction with the wellbore increase torsional loads on the drill pipe. In deeper wells, it is important in stuck pipe situations, in order to know the maximum torque that can be applied to the drill string. The pipe body torsional yield strength when subjected to torque alone can be calculated from the equation: Q = minimum torsional yield strength, ft lb J = polar second moment of area, à Ã¢â€š ¬/32 (D4 d4) D = pipe OD in, d = pipe ID in. Ym = minimum yield strength, psi. 3.2.6 Combined Loads On The Drill String Collapse and Tension The collapse resistance of the drill pipe is often reduced when the drill pipe is exposed to both tension and collapse loads. This happens because tensile loads stretch the drill pipe thereby affecting its D/t (diameter -wall thickness ratio) which controls the collapse resistance of the drill pipe. In ultra deep wells, the effect of combined collapse and tension is experienced when function testing the Blow out Preventers (BOP). It is becoming common practice in ultradeep drilling to equip BOPs with test rams in order to enable the BOP be tested without setting plugs in the well head. This is done to save tripping time due to extreme well depths. An example given by (Chatar, 2010), using 65/8in 27.70lb/ft drill pipe showed that with 65/8in drill pipe having 860kips of maximum allowable tensile loads, at half of this load, the drill string is only capable of withstanding 4,500psi collapse loads, which is often not sufficient for ultradeep drilling BOPs. The corrected collapse resistance of drill pipes under tension can be calculated using the formula Where R represents the percentage of the collapse resistance left when the drill pipe is under tension, therefore in equation 25, the value for R is used to multiply the normal plastic collapse resistance of the pipe to give the collapse resistance under tension. R can also be determined graphically with the following steps 1. Calculate Z using equation 24 2. Enter the ellipse for biaxial stress (fig 3.8) on the horizontal axis with the value for Z and draw a vertical line to the ellipse curve. 3. Draw a horizontal line from the vertical line drawn in (2) above to the vertical axis and read off the value. 4. Use the value from (5) above to multiply the collapse resistance to get the corrected collapse resistance with tension. Fig 3.8: Ellipse of Biaxial yield Strength: Effect of tensile loading om collapse resistance. (RGU Lecture notes: Casing design) Combined tension and torsion The torsional yield strength of a drill pipe is significantly reduced when the pipe is under tension loads. The torsional yield strength of the drill pipe under tension can be calculated with the equation Q = minimum torsional yield strength under tension, ft lb J = polar second moment of area. D = pipe OD in, d= pipe ID in. Ym = minimum yield strength, psi P = total load in tension, lb A = cross sectional area, in2 3.2.7 Tool Joint Performance The makeup torque to be applied to the tool joints when connecting drill pipes is calculated as follows ID = inside diameter, in. OD = outside diameter, in. Values for X, M, B and Q for standard connections are presented in the table be

What To Do About Immigration Essay -- United States Immigration Essays

What To Do About Immigration The concern about the impact that immigration imposes on American society is not a new one. Since the discovery of the New World immigrants from all over the world moved to American continent in search of a better life, that this vast and rich in sources, yet scarce in population land had promised them. Soon the immigrants outnumbered the native population. They came from England, Europe and Asia. In addition, millions of Africans were imported as slaves. By 1700 the United States became a country of immigrants and more were still to come. At that time America welcomed everybody who ventured to settle in the new country. At the end of the last century, however, not all immigrants were gladly received. The Chinese Exclusion Act of 1882 shut the door for Chinese immigrants. It was followed by Quota Act of 1921 and Immigration Act of 1924 which restricted immigration from southern and eastern Europe. Finally, the Immigration and Nationality Act of 1965 restricted the number of immigrants from every nation. Today, as the United States experience "the fourth wave" of immigration, the debate about what to do about it heats up. According to Linda Chavez, "In 1993 [?],over 800,000 legal immigrants were admitted to the United States and an estimated 300,000 illegal aliens settled here, more or less permanently. Over the last decade, as many as ten million legal and illegal immigrants established permanent residence?" (327). However, as Kenney David remarks the numbers by themselves, may not be so disturbing, for the foreign-born people represent only 8.7 percent of entire population of the United States (311). What bothers many Americans is the fact that the majority of immigrants comes from Latin America, predominately Mexico. The main objective of so-called "nativists", to whom one can refer Nicolaus Mills, is that the growing ratio of Hispanics leads to disintegration of the American nation as a union. In his article called "Lifeboat Ethics and Immigration Fears" he explores the issue of immigration and the problems it causes. Mills sees immigration as a threat to American nation as an ethnic group. He expresses his concern that high birth rates and liberal immigration laws allowing to bring relatives result in a high percentage of Mexican population in some areas. In his article Mills agrees with Peter Brimelow saying that "... ...motherland and I want it to prosper. To my opinion, the best the American society can do regarding immigration is like Kennedy concentrate on positive aspects of immigration, as Mills be aware of the problems, and work out the solutions like Chavez does. And regarding the ethnic and cultural imbalance that some Americans fear the problem seems to be somewhat exaggerated. Many Americans enjoy Mexican cuisine, like to dance salsa, and build the houses in Spanish stile, why not to accept people themselves? Works cited Chavez, Linda. "What to Do about Immigration." The Aims of Argument. A Rhetoric and Reader. 2nd ed. Ed. Timothy W. Crusius and Carolyn E. Channel: Mayfield Publishing, Mountain View, California, 1998: 327-337. Kennedy, David. "Can We Still Afford to Be a Nation of Immigrants?" The Aims of Argument.A Rhetoric and Reader. 2nd ed. Ed. Timothy W. Crusius and Carolyn E.Channel: Mayfield Publishing, Mountain View, California, 1998: 304-325. Mills, Nicolaus. "Lifeboat Ethics and Immigration Fears." The Aims of Argument. A Rhetoric and Reader. 2nd ed. Ed. Timothy W. Crusius and Carolyn E. Channel: Mayfield Publishing, Mountain View, California, 1998: 339-347.

The Justification of Morality and Why You Should Act Morally :: Morality Morals Controversial Issues Essays

The Justification of Morality and Why You Should Act Morally 1. Introduction In this paper I wish to consider the following related questions: (i) Can a system of morality be justified?; (ii) Why should one act morally?; (iii) How can others be persuaded to act morally? Clearly none of these questions is new, and moral philosophers have proposed a variety of responses to them over the centuries without reaching any general agreement. Nevertheless, because these questions are fundamental to any practical application of moral theory, it is worthwhile to continue to reflect upon them. For Jewish, Christian and Muslim societies, the justification of morality is the Word of God as expressed in the Bible and Koran. Given an authoritative text containing basic moral premises, the appropriate method for obtaining rules of conduct is a process of logical deduction from those premises to conclusions. However, if we focus our inquiry on European and American societies in the present century, the decline of belief in religious authority has undermined thi s approach to moral theory for many people. This monumental change-for morality-may be attributed to many factors. An increase in multicultural studies has emphasized the wide variety of beliefs that human beings hold, which may have led more people to doubt that any one of them is authoritative. A number of writers over the years have commented on the correspondence of specific religious beliefs with one's society of birth, again leading thoughtful individuals to question the authority of their childhood religious beliefs. As a general sociological observation, one can point to a positive correlation between increasing educational level and a diminished belief in the authority of religious texts. When thoughtful persons reject religious authority as the basis of morality, it becomes necessary to find another basis for moral beliefs. One of the few statements about contemporary moral philosophy which is unlikely to encounter opposition is that no moral theory enjoys wide acceptance. At present the most widely discussed theories of morality in the British-American literature are utilitarianism, deontology and social contract theory. The well known utilitarian approach to ethical (note 1) decision making was proposed by Jeremy Bentham in his Introduction to the Principles of Morals and Legislation (1789) and elaborated by John Stuart Mill in several books, e.g., Utilitarianism (1863). In Chapter 1, Bentham defines utility as that which "tends to produce benefit, advantage, pleasure, good, or happiness (all this in the present case comes to the same thing)".

Social Justice Assignment

In this assignment, the relevance of Rawls theory of social justice in improving the wellbeing of the people in society has been discussed. Social justice as understood by the writer is concerned with equal justice, not just in courts but in all aspects of society. This concepts demand that people have equal rights and opportunities: everyone, from the poorest person on the margins of society to the wealthiest deserves an even playing field.According to the Wikipedia encyclopedia â€Å"social justice generally refers to the ideas of creating a society of institution that is based on the principal of equality and solidarity, that understands and values human rights, and that recognizes the dignity of every human being†. This means giving to each what he or she is due. It’s about the fair and proper administration of laws conforming to the natural law that all persons, irrespective of ethnic origin, gender, possessions, race religion etc are to be treated equally without prejudice. Rawls Theory of Social JusticeRawls theory of justice revolves around the adaption of two fundamental principals of justice which would, in turn, guarantee a just and morally acceptable society. The first principal guarantees the right of each person to have the most extensive basic liberty compatible with the liberty of others. The second principle states that the social and economic positions are to be (a) to everyone’s advantage (b) open to all. Norman. D (1987:145) explains that â€Å"John Rawls is widely known for his theory of justice as fairness, which develops principals of justice to govern a modern social order.Rawls theory provides a frame work that explains the significance, ion society assumed to consist of free and equal persons, of political and personal liberties, of equal opportunities, and cooperative arrangements that benefit the more and the less advantaged members of society. † It can be seen that John Rawls discusses his own theory of s ocial justice, which he calls â€Å"justice as fairness†. In his theory, Rawls defines two basic principles of justice. First, each person should be guaranteed certain freedoms regardless of his or social status.These freedoms include political liberties such as the right to vote and eligibility for public office. Everyone is entitled to free speech, as well as freedom of conscious and thought. People should be free to own their own property and free from unlawful arrest and seizure. Pogge W. (1999:87) adds that â€Å"Justice is the first virtue of social institutions, as truth is of systems of thought. A theory however elegant and economical must be rejected or revised if it is untrue; likewise laws and institutions no matter how efficient and well-arranged must be reformed or abolished if they are unjust†.Each person possesses an inviolability founded on justice that even the welfare of society as a whole cannot override. For this reason justice denies that the loss of freedom for some is made right by a greater good shared by others. It does not allow that the sacrifices imposed on a few are outweighed by the larger sum of advantages enjoyed by many. Rawls second principal of justice states that inequities are actually okay in society as long as these inequalities still help the less fortunate.In other words, everyone deserves an equal opportunity to achieve his or her goals. For example it it is okay that a CEO of Zesco makes more than a worker but all workers should have the opportunity to achieve that work status. Rawls states that these two principals are essential in order for justice as fairness to occur. According to Rawls, inequalities sometimes become unjust. Pogge W. (1999:67) stresses that â€Å"just because Rawls’s conception of social justice values equality, this does not mean that equal out comes will be achieved in society, or that they even can be.In fact, Rawls second principle asserts that inequalities in society are acceptable as long as they meet two conditions. First, as per the equal opportunity principle. † Inequalities are acceptable if every person in society, if every person is has a reasonable chance of obtaining the positions that lead to the inequalities. An example would be equal opportunity to achieve any job. Rawls (2003:43) specifies that â€Å"fair equality of opportunity requires not merely that public offices and social positions open in the formal sense, but that all should have a fair chance to attain them†.After explaining that today’s economic inequalities are simply not acceptable, Rawls (2003:59-60) explains the differences principal this way â€Å"to say that inequalities income and wealth are to be arranged for the greatest benefit of the least advantaged simply means that we are to compare schemes of cooperation by seeing how well off the leased advantaged are under each scheme, and then to select the scheme under which the least disadvantaged are better off than they are under any scheme.†With two competing arrangements of incomes in society, the fairer of the two and therefore the more just of the two is the one that is to the greatest benefit of the least advantage. Relevance of John Rawls theory of social justice in improving human wellbeing in society. Rawls' theory provides a framework that explains the significance, in a society assumed to consist of free and equal persons, of political and personal liberties, of equal opportunity, and cooperative arrangements that benefit the more and the less advantaged members of society. The following are the reasons why this theory is relevant.It advocates for equal rights of individuals. According to Voice . P (2011:189) stresses that â€Å"one the first principle –each person is to have an equal right to the most extensive total system of basic equal liberties compatible with similar systems of basic equal liberties compatible with a similar system of liberty for all. The second principle states that social and economic inequalities are to be arranged so that they are both: (a) to the greatest benefit of the least advantaged consistent with the just savings principal, (b) attached to offices and positions open to all under conditions of fair equality of opportunity.†.These principals distribute the primary goods, rights and liberties in the first principles and opportunities, income and wealth in the second principal. The theory addresses injustices by recognizing the importance of social institutions in society. Rawls theory is very realistic in that it looks at the actual events and institutions that exist in society. As stated earlier, social justice is the idea of creating a society or institution that is based on the principles of equality and solidarity, that understands and values human rights, and that recognizes the dignity of every human being.From this theory it can be seen that he Rawls advocates for a society in which ther e is cooperation. Lovett . F (2011:10) explains that â€Å"the basic structure of a society which he defines as a way in which major social institutions distribute fundamental rights and duties determine the division of advantage from social cooperation. In A Theory of Justice, Rawls begins with the statement that Justice is the first virtue of social institution,’’ meaning that a good society is one structured according to principals of justice. †Abasic structure of a society is a set of social institutions and practices that systematically influence how well our lives can be expected to go, individual efforts aside. Here, Rawls explains the importance of principles of justice for two key purposes. First, to provide a way of assigning rights and duties in the basic institutions of society, and secondly, to define the appropriate distribution of the benefits and burdens of society. He observes that, by his definition, well-ordered societies are rare due to the f act that what is just and unjust is usually in dispute.He further notes that a well-ordered and perfectly just society must be formulated in a way that addresses the problems of efficiency, coordination, and stability. It acknowledges the importance of human rights. Rawls (2003:75) says â€Å"A just world order is perhaps best seen as a society of peoples, each people maintaining a well-ordered and decent political (domestic) regime, not necessarily democratic but fully respecting basic human rights.†Human rights are expansive and include rights in the following areas: general freedom; dignity; life; liberty; security; equality before the law; fair and public hearings by independent and impartial tribunals; presumption of innocence until proven guilty; freedom of movement and residence; right to seek and gain asylum from persecution. † The above are not the only human rights, but there are others. Human rights are expansive and include rights in many areas. For example, there should ne explicit inclusion of economic, social and cultural rights. Rights of disadvantaged groups including children, women, disabled and the elderly.Rawls theory is based on the social contract. The social contract according to the Wikipedia encyclopedia is â€Å"an intellectual construct that typically addresses two questions, first, that of the origin of society, and second, the question of the legitimacy of the authority of the state over the individual. Social contract arguments typically posit that individuals have consented, either explicitly or tacitly, to surrender some of their freedoms and submit to the authority of the ruler or magistrate (or to the decision of a majority), in exchange for protection of their natural rights†.This means people need to agree on some ground rules in order to live together in harmony. Deneulin S. and Shahani L (2009:234) stresses that â€Å"Rawls turned to social contract tradition, when justice is understood as the outcome of mutual advantage†. Rawls conception of social justice is developed around the idea of a social contract, whereby people freely enter into an agreement to follow certain rules for the betterment of everyone. For example, people cast their votes during presidential or parliamentary election so that these people can represent then and address issues that affect society.If they fail to work according to the expectations of the people, they are voted out. The theory also recognizes the fact that inequalities should be of benefit to all the people in society. In other words, everyone deserves an opportunity to achieve his or her goals. Pogge W (1989:47) stipulates that â€Å"inequalities are acceptable as long as they meet two conditions. Daniel N (2009:57) explains that â€Å"inequalities in society are at times just. There are atleast two reasons for this. First economic inequalities that motivate people to strive for more can sometimes be justified, second inequalities may result from differential claims on merit†.For example, it can be looked at to be unfair if a person is getting 200 million while others are getting 20million but all workers should have the opportunity to achieve that work status. . Every person should be able benefit from the national cake depending on how much is available. This theory calls for meritocracy. that Rawls’s theory of justice acknowledges meritocracy in society. This is relevant in that meritocracy is based on ability and talent rather than on class privilege or wealth. The allocation of rewards, positions and responsibilities is objective and upon the merit of an individual.By doing so the disadvantaged members of society should also benefit. Inequalities must only occur in certain institutions and jobs that there is unequal opportunity for all to obtain. These inequalities must only occur in certain institutions and jobs that there is an equal opportunity for all to obtain. These inequalities include th e distribution of income and wealth. Also inequalities are acceptable if they are used for the purpose of delegating different responsibilities in a chain of command. The other relevance is that, the theory is based on the foundation of justice is fairness.Fairness means free from bias or injustice or the ability to make judgments free from discrimination or dishonesty. According to Rawls, justice is what free and equal persons would agree to as basic terms of social cooperation in conditions that are fair for this purpose. This idea he calls â€Å"justice as fairness. † Daniel N (2009:76) states that â€Å"Justice is the most important political value and applies to the ‘basic institutions of society’ – the political constitution and the institutions that regulate the market, property, family, freedom, and so on – because it is intimately connected to what society is and what it is for.If society is a matter of cooperation between equals for mutua l advantage, the conditions for this cooperation need to be defended and any inequalities in social positions must be justified†. Were there is justice there is peace free participation of individuals in society. This is to say the principles that free and rational persons concerned to further their own interests would accept in an initial position of equality as defining the fundamental terms of their association. Justice, then, is fairness. Deneulin S.and Shahani L (2009:123)â€Å"For our agreement to secure a fair, impartial procedure, we need to eliminate any possible bias towards, say, the rich or the poor, or the religious or the atheist. So, argues Rawls, assume that we are to agree on these principles without knowing what our position in society will be or what our idea of the good is. The point of this ‘veil of ignorance’ is to ensure that no one is advantaged or disadvantaged in the choice of principles by the outcome of natural chance or the contingenc y of social circumstances†. This theory is relevant in that, it advocates for social justice.This is relevant to the wellbeing of the people in that credit is able to go to those who deserve it. For example, most people who benefit from the bursary scheme are those who are capable of paying. The people it is intended to help do not even have access to it. Therefore, society craves for a time when the vulnerable will have a share of the national cake. Thus, Since all are similar situated and no one is able to design principles to favor his particular condition, the principles of justice are the result of a fair agreement or bargain.Conclusion In conclusion, it should be noted that, Rawls theory is relevant in improving the wellbeing of the people in society. It is very practical in that it is marked by both conflicts between differing individual interests and an identity of shared interests. According to Rawls, when the two principles are satisfied, each person’s liberti es are secured and there is a sense defined by the difference principle in which everyone is benefited by social co-operation