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1、5.8 Analysis of Gas Well Buildup Tests-15.8 Analysis of Gas Well Buildup Tests-1Constant-Rate Production Before Shut InConstant-Rate Production Before Shut InFor a slightly compressible liquidQ-QTTT+tT+tUsing Superposition methodfor a gas well,in terms of adjusted variablesQ-QTTT+tT+tUsing Superposi
2、tion methodFrom the semilog graphfor a gas well,in terms of adjusted variablesextrapolating the straight line to infinite shut-in timeis BHFP at the instant of shut in.Example 5.4-Analysis of a Gas-Well Pressure-Buildup Test With Constant-Rate Production Before Shut-InTABLE 5.9-GAS-WELL PRESSURE-BUI
3、LDUP TEST DATA,EXAMPLE 5.4SolutionAnalysis Using Pressure Variables(Fig.5.25).1.Calculate the slope of the line drawn through the semilog straight line.m=8,989.7-8,545.1=444.6 psi/cycle2.The permeability to gas isat=(2000+1)/1=2001 is 7,522 psia.3.Calculate the skin factor.The pressureUsing Pressure
4、-Squared Variables(Fig 5.26).1.Calculate the slope of the line drawn through the semilog straight line.m=80.67106-73.07106=7.60106psi2/cycle2.The permeability to gas is3.Calculate the skin factor.The term at at =2001 is Using Adjusted Pressure Variables(Fig.5.27)1.Calculate the slope of the line dra
5、wn through the semilog straight line.m=7,553.8-7,117.5=436.3 psi/cycle2.The permeability to gas is3.Calculate the skin factor.At an adjusted Horner time ratio of=(20001)/1=2001,=6114 psia.permeability skin factorPressure Variables 0.029-0.292Pressure-Squared Variables 0.031-1.08Adjusted Pressure Variables 0.03-0.04Compare three methods5.8 Constant-Rate Production Before Shut In（End)