Answered: Grade ID (in) Weight (lb/ft) Coupling…

Grade ID (in) Weight (lb/ft) Coupling type Collapse Resistance H40 9.001 32.3 STC 1522 K55 8.921 36 BTC 2244 L80 8.835 40 LTC 3433 C90 8.755 43.5 BTC 3611 C95 8.681 47 LTC 5655

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Question

The following five grades of 9 5/8” in casings are available in a company store. It is required to run a combination string based on collapse only. The casing is run in 67 pcf mud to 9000 ft. Safety factors for collapse and burst are 0.90 and 1.05 respectively. The next hole depth is proposed to be in 12000 ft and 0.55 psi/ft formation pressure gradient. Using this table

Grade
ID (in)
Weight (lb/ft)
Coupling type
Collapse Resistance
H40
9.001
32.3
STC
1522
K55
8.921
36
BTC
2244
L80
8.835
40
LTC
3433
C90
8.755
43.5
BTC
3611
C95
8.681
47
LTC
5655

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