18 Casing Design Example

# 5 ft pipe 28 casing design at some depth the 435 ft

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Unformatted text preview: n more economical string would include some 43.5 #/ft pipe? 28 Casing Design At some depth the 43.5 #/ft pipe would be able to handle the collapse requirements, but we have already determined that it will not meet burst requirements. ∴ NO! 29 Burst? N-80 43.5 #/ft? N-80 47.0 #/ft N-80 53.5 #/ft Depth = 5,057? 5,066? 5,210? Depth = 6,369 6,369 6,382 6,509 8,000 30 N-80 53.5 #/ft? Tension? N-80 47.0 #/ft N-80 53.5 #/ft Depth = 6,369 6,369 6,382 6,509 8,000 31 Tension Check The weight on the top joint of casing would be (6,369 ft * 47.0# / ft ) + (1,631 ft * 53.5# / ft ) = 386,602 lbs actual weight With a design factor of 1.8 for tension, a pipe strength of 1.8 * 386,602 = 695,080 lbf is required 32 Tension Check The Halliburton cementing tables give a yield strength of 1,086,000 lbf for the pipe body and a joint strength of 905,000 lbf for LT &amp; C. ∴ 47.0 # / ft is OK to surface 33 Casing Design Review We have 4 different weights of casing available to us in this case: 1. Two of the four weights are unacceptable to us everywhere in the string because they...
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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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