18 Casing Design Example

# 5 ft pipe below us the weight of this pipe will

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Unformatted text preview: 8,000 - 6,509) = 1,491’ of 53.5 #/ft pipe below us. The weight of this pipe will reduce the collapse resistance of the 47.0 #/ft pipe! 17 Casing Design Weight, W1 = 53.5 #/ft * 1,491 ft = 79,769 lbf This weight results in an axial stress in the 47 #/ft pipe weight 79 ,769 lbf of S1 = = = 5,877 psi 2 end area 13.572 in 18 Casing Design The API tables show that the above stress will reduce the collapse resistance from 4,760 to somewhere between 4,680 psi (with 5,000 psi stress) and 4,600 psi (with 10,000 psi stress) 19 Casing Design Interpolation between these values shows that the collapse resistance at 5,877 psi axial stress is: S − S1 Pc1 = P1 − S − S (P1 − P2 ) 1 2 (5,877 − 5,000 ) Pc1 = 4,680 − * ( 4,680 − 4,600) = 4,666 psi (10,000 − 5,000) With the design factor, Pcc1 4,666 = = 4,148 psi 1.125 20 Casing Design This (4,148 psig) is the pressure at a depth 4,148 h2 = = 6,382 ft 0 .052 * 12 .5 Which differs considerably from the initial depth of 6,509 ft, so a second iteration is required. 21 22 23 Casing Design Second Iteration Now consider running the 47 #/ft...
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## This note was uploaded on 12/03/2012 for the course PMRE PMRE6004 taught by Professor M.tamim during the Summer '12 term at Bangladesh University of Eng and Tech.

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