Drillpipe Design

546041252.xls

MITCHELL ENGINEERING PROGRAMS

COPYRIGHT 1990 MITCHELL ENGINEERING, PO BOX 1492. GOLDEN, CO, 80402, USA (303) 273 3744

DRILLPIPE DESIGN 30 256 13,293 11.0 11.0 0 0

30 BHA LENGTH: (ft) 11.00 BOTTOM HOLE DEPTH; (ft) 500 INTERNAL MUD WT: (ppg) 550 EXTERNAL MUD WT: (ppg) 0 INT'L SURF. PRES.: (psi) 11 BHA WEIGHT; (k lb)

OVER PULL (k lb) Dogleg Severity: (deg/100') Dogleg TOP Depth: (ft) Dogleg BOTTOM Depth; (ft) Investigation depth "X" (ft) Torque: (k lb-ft)

EXT'L SURF. PRES.: (psi)

Drillpipe Status Table VonM Tens Burst COLLAPSE Torq Bend DESIGN FACTORS==> 1.25 1.25 1.10 1.20 1.50 TOP BOTTOM TOP BOTTOM TOP Sec # DP #BOTTOMTOPLENGTH 1 2 ### 8,037 5,000 ok ok ok ok ok ok ok 2 3 8,037 5,037 3,000 ok ok ok ok ok ok ok 3 5 5,037 3,037 2,000 ok ok ok ok ok ok ok 4 4 3,037 550 2,487 ok ok ok ok ok ok ok 5 6 550 500 50 ok ok ok ok ok ok ok ok 6 4 500 0 500 ok ok ok ok ok ok ok 2487

FIGURE CELL

DRILLPIPE SELECTION TABLE

DP # GRADE WT

1 2 3 4 5 6

D60 E75 E75 X95 G105 S135

OD

ID

TJTS YPapi WEAR Sjt

k lb/ft

in

in

k lb-ft

k lb

%

k lb

21.0 14.1 17.6 22.1 18.0 23.2

5.0 3.5 4.0 5.0 4.5 5.0

4.276 2.862 3.145 4.276 3.826 4.276

25 16 24 32 29 37

60 75 75 95 105 135

20 15 20 8 20 35

350 276 567 743 345 465

TJTS= torsional strength of tooljoint: (k ft-lb) Sjt = tensile strength of tooljoint; (lb)

PROGRAM DOS NAME: DRILLPIPE DESIGN.XLS PURPOSE: Designs drillpipe COMPUTATIONS: 1. Body, collapse, burt, tensile strengths 2. von Mises, radial, tengential, axial, bending, torsional stresses