(9)--9-Discrete Change in Rate Before气藏工程气藏工程.ppt
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1、5.7 Analysis of Gas Well Buildup Tests-25.7 Analysis of Gas Well Buildup Tests-2Discrete Change in Rate Before Shut InDiscrete Change in Rate Before Shut In1、Superposition MethodWe can develop an analysis technique for buildup tests with discrete rate changes before shut-in using superposition in ti
2、me for(n-1)rates preceding the pressure-buildup testFig.5.19-Rate history for buildup test following n-1 different flow rates For the general case where qn=0 and for(n-1)different rates before shut-in,Analysis procedure in terms of adjusted variables:(1)Calculate the plotting function.(3)Determine t
3、he slope m of the straight line.(2)Plot pa,ws vs.X on Cartesian coordinate graph paper.(4)Calculate permeability to gas using the slope from Step 3.(5)Calculate the skin factor.(6)The initial adjusted formation pressure,is thevalue ofon the straight line extrapolated to X=0.2、Odeh-Selig MethodFig.5.
4、19-Rate history for buildup test following n-1 different flow rates As an alternative to superposition,Odeh and Selig suggested that a buildup test following n different rates could be analyzed by a method similar to the Horner method.The shut-in pressure response is where the modified production ti
5、me,,and flow rate,,areThe Odeh-Selig method,approximate but accurate,is applicable only for pressures at values greater than actual producing time.This condition is likely only in a drill stem test or short production test.3、Horners MethodFig.5.19-Rate history for buildup test following n-1 differen
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