1 140 copyrightc 2005 by ali ghalambor boyun guo 70

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Unformatted text preview: aximum burst load results. The source of the gas is the highest pressured zone in the interval of hole below the surface casing. This is total depth in some wells, the intermediate casing point in others. See Fig.1. 140 Copyright(c) 2005 by Ali Ghalambor & Boyun Guo 70 Fig.1 141 There are two possibilities for the actual burst load line. The pressure at which the formation at the casing shoe fails, will determine which possibility to use. This injection pressure is calculated using: Inj.P.=(FG+SF)(.052)(SD) (Eq.1) Where: Inj.P.= Injection Pressure (psi) FG = Fracture Gradient at Weak point In Open Hole Below Casing (ppg) SF = Safety Factor- Enough Additional Load To Insure Formation Will Fall (ppg) SD = Setting Depth of Casing String(ft) 142 Copyright(c) 2005 by Ali Ghalambor & Boyun Guo 71 If the injection pressure is greater than the source of the kick pressure less the gas hydrostatic at the surface casing shoe, the burst load line will be as shown in Fig.2a, and no underground blowout will exist. If the injection pressure is less th...
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This document was uploaded on 03/28/2014.

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