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Drill Pipe Elongation Calculation
Reference: Petroleum Engineering Handbook
Tubing Size: 5 inches
http://workstringsinternational.com/equipment/spec sheets/d
rill pipe/
Use 5 in, grade S135 pipe with an NC-50 (Range II) connection.
Drillstring Lengths (DSL): 5000 ft, 10000 ft, 15000 ft
Mud Densities: 0, 10 and 15 lbs/gallon
PL
eT =
L2 (65.44 - 1.44pm)
735444WDP
+
9.625 X 107
PM = Mud Density in lbs/gallon
P = End Load in lbs
Wop = Drill Pipe Weight in Ibs/ft
L = Drill String Length in ft

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PL em” : 735444WDP Handbook Formula End Load Component L2
epw = (m) x 65.44 Handbook Formula Self Weight Component In the Petroleum Engineering Formula the end load term
utilizes WDP, the pipe weight per foot. With this information,
steel density, and the outer diameter of the pipe you can
calculate the inner diameter of the pipe and then determine
the wall thickness. The strength of materials end load solution
does not check with the Petroleum Engineering Handbook
term for end load if the spec sheet thickness is utilized. Note that specific units are given to calculate eT in the
Handbook equations. Consistent units are utilized in strength
of material calculations.

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Strength of Materials Calibration 0.5
4W
Di : !D§ _ ( Help)! Do: Outer Diameter of Pipe p5: Density of Steel Di: Inner Diameter of Pipe: Steel Density Calculation Using Spec. Sheet Parameters _ WDP _ 1.625 _ 0 308 lbs
p5 _ up; — (r0 — 202} 95 _ n{2.52 — (2.5 — .362)2} _ ' ms HIGH!!!
t: Spec. Sheet Wall Thickness

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Strength of Materials - Elongation Due to Self Weight
Derivation: Lecture Slides _ “151,32
85'” ' ZAE W5: psgA
p5: Density of Steel g: Acceleration of Gravity
A: Cross Sectional Area of Pipe Wall

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Use of the Petroleum Engineering Handbook formula. 1. Calculate drill string elongations for lengths of 5000, 10000,
and 15000 ft. 2. Calculate the drill string elongations for a length of 10000 ft
and mud densities of 10 and 15 lbs/gallon. 3. Calculate the drill string elongation for a length of 10000 ft,
mud density of 10 lbs/gallon, and end load of 50000 lbs.

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1. Compute the self weight and end load elongations for a
10000 ft. drill string using the Strength of Materials
equations (elongation in dry hole). Why are the results
different than those obtained in the previous drilling
exercise? 2. Compare results from (1.) with those obtained previously
using the Petroleum Engineering Handbook equations.

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