Does anyone have a simple formula for working out the stretch of casing in a vertical well? Because a large number of factors are not considered, it is typically used with a high axial design factor (e.g., 1.6+). 5C3, Formulas and Calculations for Casing, Tubing, Drillpipe, and Line Pipe Properties. As an oil well is drilled, each new section of drill pipe supports its own weight and that of the pipe and drill bit beneath it. Open the choke and bleed fluid out of the well until the drill pipe pressure drops to the lower limit. In the British system of units, the unit of stress is 'psi,' which stands for 'pound per square inch' (lb/in2). ( lb/in 2). indicate free pipe at points below the level where the pipe can possibly be retrieved after a backoff or cut. Pipe recovery is a specific wireline operation used in the oil and gas industry, when the drill string becomes stuck downhole. configurations, although additional size com- binations are available. Work Safe! drill pipe & drill collar classifications standard drill pipe, drill collar, heavy weight & subs color codes class 1 new premium class premium class class 2 class 3 class 4 remaining wall o.d reduction cuts and gouges (excluding sharp bottom transverse) minimum wall thickness mashes stretch slip area 87% 80% 80% 80% 80% 3% of o.d. This eliminates the time-consuming and error-prone practice of first assimilating data and obtaining results using a separate calculator. 8 438. . 2) Normally, the pipe is considered as a thin wall cylinder i.e. F = force exerted by material (in this case, shear force created by pumping) k = force constant or spring constant x = deformation or additional pipe stretch Rearranging Hooke's Law to x=F/k gives. One of the advantages of Mathcad is that it understands units. Drill pipe data tables The following tables provide data for the drill string. formulas and calculations for drilling, production, and workover, all the formulas you need to solve drilling and production problems, fourth edition provides a convenient reference for oil field workers who do not use formulas and calculations on a regular basis, aiming to help reduce the volume of materials they must carry to the rig floor or back off pipe, estimation of free point of the stuck pipe is the key point. Drilling engineering features: The Sysdrill BHA string constructor for quick construction of complex BHA's by rapid filtering of extensive catalogs of drilling equipment. Using stretch calculations for determining free casing; Tubing, drill pipe, and casing stretch data; General stretch formula; Stretch tables; Determining stretch; Determining the free point; Calculation of SC and FPC; Stretch graphs; Set-down and slack-off weights; Chapter 7: Parting the Pipe String. a) Determining Free Point Based on Pipe Stretch Data. Question. Data are given for the pipe body, tool joint, and drill pipe assembly. Label this "Mark 2" A. OK not something you need every day but when you do instead of waiting for a third party contractor to show up on the rig you have the answer in seconds just with a few inputs Select Drill Pipe, Heavy Weight and Drill collars add in the Over Pull, Pipe Stretch and get the point between . First, pull tension on the pipe at least equal to the normal Top Drive hook load (air weight) of the pipe prior to getting stuck. When the pipe is backed off and pulled out to surface, the fish Grade E drill pipe, referred to as "mild" steel, exhibits the lowest yield strength per unit area with a yield strength of less than 80,000 psi. Pull force = 35,000 lb. The pipe is equivalent in stiffness to a solid cylinder 5.00 cm in . It should be possible to determine if the free point is moving up the hole. Record the WIR up and WIR down. Transverse internal area can be expressed as. Casing stretch calculation. Applied Drilling Formulas Calculations Spreadsheet This section includes the following formulas: Drill Collar Weight Calculation Effective Mud Density Equivalent Circulating Density (ECD) Using drilling mud Yield Point for MW less than or equal to 13 ppg Equivalent Circulating Density (ECD) Using Yield Point for MW more than 13 ppg Lag time. 1994. For this study we will use stretch constants. Pick up string to desired packer depth and apply right hand torque. Stuck pipe prevents the drill rig from continuing operations. Ensure that packer is not set within 5 ft of casing collar. PPI is committed to providing an accurate means . 3.4.1 The liner hanger. Once, pipes are routed following design guidelines, those needs to be verified by piping stress analysis to ensure they will work smoothly throughout their design life. and I.D. Just enter desired tension, depth, and tubing size and you're . Next, allow the drill pipe pressure to further increase by another 50-100 psi. one pascal = 1.0 Pa = 1.0 N 1.0 m 2. Drill collar weight calculation to prevent drill pipe buckling; Effective mud density; Equivalent Circulating Density (ECD) using yield point for MW less than 13 ppg; Equivalent Circulating Density (ECD) using yield point for MW more than 13 ppg; Lag time calculation; Light weight spot fill to balance formation pressure Work the string across the desired setting depth. Scott McNeil. HWDP Specifications Definition (s) Bending Strength Ratio The ratio of the section modulus of a rotary shouldered box at the point in the box where the pin ends when made up divided by the section modulus of the rotary shouldered pin at the last engaged thread. Note the slack off and stretch. The principal factors resulting in an increase in string length are the weight of the string itself and the effects of thermal expansion. HDPEapp is an online tool developed for and released by the Plastics Pipe Institute (PPI). Drill collar weight calculation to prevent drill pipe buckling; Effective mud density; Equivalent Circulating Density (ECD) using yield point for MW less than 13 ppg; Equivalent Circulating Density (ECD) using yield point for MW more than 13 ppg; Lag time calculation; Light weight spot fill to balance formation pressure Mathcad is brilliant software for serious calculations, far superior to Excel or your local calculator. t . Stuck Pipe Calc app performs a quick oilfield calculation for estimating free point of stuck Drill Pipe or Tubing in a well. Sysdrill Torque & Drag for determining the drillability of wellbores and design of drill strings. Run packer to below desired setting depth. Internal pipe or tube surface per ft of length can be expressed as. INTRODUCTION Oil and gas well control procedures for C, R,& W operations are significantly different than those used when drilling. The equation \displaystyle\Delta {L}=\frac {1} {Y}\text { }\frac {F} {A}L_0 L = Y 1 AF L0 can be used to find the change in length. Includes on-the-job answers and formulas for today's hydraulic fracturing methods. The force is equal to the weight supported, or F = mg = (62.0 kg) (9.80 m/s 2) = 607.6 N, and the cross-sectional area is r2 = 1.257 10 -3 m 2. A i = d i / 12 (5) where . Depth, for formation evaluation, is ii) Take an overpull on the pipe of +/- 50,000 lbs (but do not exceed 80% of the minimum ield strength of the pipe) and set the brake. The purpose of this tool is to assist industry professionals in the evaluation and selection of HDPE pipe by performing design calculations documented in the PPI-Handbook of Polyethylene Pipe, 2nd Edition. Is the formula given in the Haliburton book for tubing & small casing still valid for 13 3/8" casing, and if so, how do you calculate the value of the stretch constant? Its wall thickness is up to 3 times that of a similar-sized normal drill pipe to add additional weight to the bit. Covers topics such as drilling fluids, pressure control, engineering calculations, and air and gas calculations. Thanks in advance for your help. Free Point Calculator for Excel, is a Stuck Drill String calculator, and very easy, fast running program. As an oil well is drilled, each new section of drill pipe supports its own weight and that of the pipe and drill bit beneath it. It is also more resistant to corrosion and cracking. You need to adjust the numbers according to the pressure of your compressor and the applications at hand. Measure the stretch of the pipe to determine the approximate position of the free point Pull to the neutral weight of the pipe above the stuck point. Hence this stress is called longitudinal stress. Decide what type of sticking is involved, and use stretch table to determine where the free point. Stretch readings in sand-stuck pipe are often erratic. The maximum outer fiber tensile stress should not exceed an allowable stress. 2. Next, pull additional tension which has been predetermined within the range of safe tensional limits on the pipe. This is the upper limit. HWDP is manufactured in accordance with API Spec. Jmudsg 1000 ftm Steel vertical length. A liner hanger, as the name suggests, secures and supports the liner. 2018.02.06. Pipe stretch and compression will occur from time to time but are not corrected for during normal operations, even though they can introduce fairly significant cumulative errors on driller's depth . 4. lb/ft in. Axial: shock loads. The pipe is equivalent in stiffness to a solid cylinder 5.00 cm in diameter. Annular pressure tool shows that of water even though we are running between 9-9.2 ppg. 1. n. [Well Completions] The increase in length resulting from the combination of forces acting on a string within the wellbore. 3. Mark the pipe at this point and label this point "Mark 1" Pull to the neutral weight of the pipe plus the stretch required from the wireline contractor's tables. Tubing Stretch Table OD Weight ID Wall Area Stretch Constant Free Point Constant in. For example, if your system handles 120 psi, the pipe should be expected to carry more air at one percent loss. Made specifically for oil field applications. 1.0 1.1 API Bull. 25.2 lb/ft. Shock loads can occur, if the pipe hits an obstruction or the slips close while the pipe is moving. in2 in./1,000 lb/1,000 ft 1.050 1.14 0.824 0.333 1.20120 832.5 Pipes & Tubes . The measurement of depth in the wellbore is the first and arguably the most important measurement for formation evaluation, because it is the basis for cross-referencing and integrating most wellbore data. reflexology board The drill pipe can be classified according to many parameters such as length, diameter, weight, upset and grade of steel. The stuck pipe Calculator allows you calculate up to 4 sections of Drill Pipe 3 sections of Heavy Weight 3 sections of Drill Collars Maximum Over pull Pipe Stretch, User selectable units API or Metric with a minimum amount of inputs you have the free point calculated The free point program can be added as a compliment to DrillPro Calculating the differential stretch (E = S2 - S1), differential pull (P = T2 - T1) and applying Hooke's Law, it is possible to determine the depth of free point (L) using the following formula. This equals the length of pipe between the stuck point and surface. As an oil well is drilled, each new section of drill pipe supports its own weight and that of the pipe and drill bit beneath it. Sysdrill TH-Hill DS-1 Design Compliance for drill pipe and BHA fatigue . There are four factors which change the depth of CT in a well compared to the measured length of CT run into the well at surface: Stretch due to axial force Thermal elongation Elongation due to pressure differential Shortening due to helical buckling The stretch due to axial force is the primary discussion in this paper. The i-Handbook was designed with three objectives: retain the book format of the Field Data Handbook. Calculations begin with known forces at the bit, and proceed up the drill string in sequential fashion with torque and drag along the drill string being understood. Just put in pipe OD/ID along with pulling force and stretch and get an immediate calculated result for linear feet of free pipe. 5C3, Formulas and Calculations for Casing, Tubing, Drill Pipe, and Line Pipe Properties, sixth edition. This results in costly downtime, ranging anywhere from $10,000-1,000,000 per day of downtime, therefore it is critical to resolve the problem as quickly as possible. During the course of drilling or work- . HWDP is used most commonly in directional drilling because it bends more easily and helps to control torque and fatigue in high-angle operations. Description This worksheet will calculate the change in length of pipe due to a) it's own weight when submerged in fluid, b) additional axial load (tension or compression) and c) a change in the average temperature. Baker Hughes provides one proven source for all your completion, workover and fishing needs. The space between the liner hanger and the casing shoe is called the liner lap. If the drill pipe is worn to less than nominal weight, stretch tables may not be accurate. Like the air weight criterion, this load case has wide usage, because it is an easy calculation to perform. For multiple sizes or weights, calculate stretch for each section and sum the results. L_Vsteel 5 4.276 inmm Pipe OD and ID. Easily figure out amount of stretch needed to leave tubing string in a desired tension. iv) Calculate the length of free pipe using the following equation:- Using higher working weights when determining the free point helps to obtain an accurate backoff or cutting depth. Example: Calculate the length of free drill pipe with the following data: Drill pipe = 6.625 in. Piping Stress Analysis is the most important activity in Piping Design. Liner hangers can be set hydraulically, mechanically, or a . Provides extra utility with an online basic equation calculator for 24/7 problem-solving access. Common Stretch Constants Pipe Size Constant 2 3/8 4.7# Tubing 0.3100 2 7/8" 6.5# Tubing 0.2200 3 1/2" 9.3# Tubing 0.1544 2 7/8" 10.4# Drill Pipe 0.1400 3 1/2" 13.3# Drill Pipe 0.1100 OD and ID are inch unit 2) Determine depth of stuck pipe by this following formula: Depth of stuck pipe = (Pipe stretch in inch x free point constant (FPC)) Pull force in thousands of pounds Depth of stuck pipe = ( Pipe stretch in inch x free point constant ( FPC ) ) Pull force in thousands of pounds This formula also can be used to determine the length of free pipe by applying a load, F, . (S-135) Stretch = 20 in. drillpipe, drill collars, tubing or casing and provides the force that frees the stuck assembly. Though basic pressure considerations are the same, implementation methods vary greatly due to well conditions, which are often unique to individual wells. Stretch of Drillpipe The elongation or stretch of the drillstring is caused by pulling the string as well as due to its own weight. 1) On comparing equations 1 & 2, it is clear that when a pipe having diameter 'D' and thickness 't' is subjected to an internal pressure 'P', the induced circumferential tress is double the induced longitudinal stress. Torque readings can generally be taken at deeper Solution All quantities except L are known. The stretch in the pipe is found with reference to some fixed point which will not move when extra pull is applied (SI UNITS) 26.374 x Wdp x e where L = Length free pipe in metres Wdp = Plain end pipe weight in kg/m e = Differential stretch in mm p = Differential pull in kN Drawing from a full range of patented products and systems, our people work together in a coordinated effort directed at the total picture, not just isolated pieces of it. Calculate the stretch in a new 6.00 m length of steel pipe that supports 3.00 km of pipe having a mass of 20.0 kg/m and a 100-kg drill bit. Step 1: Determine the drill pipe stretch from Table 2.4: K fpt = . 2 Torque and drag calculations of stuck pipes During normal operations, drag remains in the same direction as the entire drill string is either moving or stationary. The linear capacity of the pipe is C,=-^-bbl/ft, (1.1) ' 808.5 where A is a cross-sectional area of the inside pipe in square inches and equals 0.7854 x Dj , and D. is the inside diameter of the pipe in inches. This should then be marked on the pipe as point "a". i-Handbook, an electronic version of the Field Data Handbook, displays data that helps compute results fast. used to transmit rotation and weight to bit via drill pipe and drill collars rotation and weight on bit are essential for breaking rock and making hole manufactured from high grades of chrome molybdenum steel and heat treated has either square or hexagonal shape hexagonal is stronger than square lengths are 40 ft (12.2 m) or 54 ft (16.5m) Volume capacity is V = C I .xLbbl, (1.2) where L = the length of the pipe, ft. 1 2 FORMULAS AND CALCULATIONS FOR DRILLING OPERATIONS 3% of o.d . This article will explain the basic points for Piping Stress Analysis. When one newton of force presses on a unit surface area of one meter squared, the resulting stress is one pascal: one pascal = 1.0Pa = 1.0N 1.0m2. A drill string on a drilling rig is a column, or string, of drill pipe that transmits drilling fluid (via the mud pumps) and torque (via the kelly drive or top drive) to the drill bit.The term is loosely applied to the assembled collection of the smuggler pool, drill collars, tools and drill bit.The drill string is hollow so that drilling fluid can be pumped down through it and circulated back . The axial strength of the pipe body is determined by the pipe body yield strength formula found in API Bull. Oil & Gas Calculator; Freeing Stuck Pipe. 7: As an oil well is drilled, each new section of drill pipe supports its own weight and that of the pipe and drill bit beneath it. Stretch = inches, from over-pull force Area = cross-sectional area of CT pipe wall Force =applied weight over weight of pipe in air to stretch the CT Example: CT OD = 1.5 CT ID = 1.282 Stretch = 120 inches Force = 15000 lbs (Weight Indicator) 120 * 30,000,000 * .476 / 15000 /12 = 9520 feet. 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