In a casing design the mud is an 8020 ratio with the

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Unformatted text preview: t Loading An alternative backup load for burst loading for any type of casing has been proposed by Vorenkamp. Several operators and turnkey contractors are currently using this technique. 226 Copyright(c) 2005 by Ali Ghalambor & Boyun Guo 113 Example: 12.0 ppg oil emulsion mud is to be used as backup fluid to 10000 t. in a casing design. The mud is an 80/20 ratio, with the oil making up the 80%. Base oil weighs 6.0 ppg, seawater weighs 8.7 ppg, and solids weigh 35.0 ppg. The annulus in a consistent 12 1/4”×9 5/8”. Solution: let x=liquid volume percentage 1-x= solids volume percentage Therefore 12.0=0.8×6+0.2×8.7+(1-x)(35) And x=0.807 Solids=0.193 Since the annulus is all the same size, volumes of the components can be interchanged with length: Oil length = (0.807)(0.80)(10000)=6456 ft Water length = (0.807)(0.20)(10000)=1614 ft Solids length = (0.193)(10000)=1930 ft The hydrostatic contribution of each component is : Oil = (6456)(6.0)(0.052)=2013 psi Water = (1614)(8.7)(0.052)=730 psi Solids = (1929)(35.0)(0.052)=3510 psi 2013+730+3510= 6253 psi For mixed 12.0 ppg mud, the hydrostatic contribution is: Mud=(12)(0.052)(10000)=6240 psi 228 Copyright(c) 2005 by Ali Ghalambor & Boyun Guo 114 Section 2 Casing Catalog (See Manual for Detail) 229 Sectio...
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