气藏工程气藏工程气藏工程 (27).pdf
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1、5.7 Analysis of Gas well Flow Tests5.7 Analysis of Gas well Flow Tests-2 2Gas Flow Tests with Smoothly Changing Gas Flow Tests with Smoothly Changing RatesRates In many testing situations,a strictly constant producing rate is impractical or impossible to maintain.A more probable mode of operation is
2、 production at a constantsurface pressure,and if tubing friction effects are negligible,theBHP is also constant.Dataobtainedunderthesenon-idealtestconditionscanbeanalyzed accurately with a simple modification of the transient flowequation for constant-rate production.srcktkhBqppwtwfi869.023.3log6.16
3、22For slightly compressible liquids2162.6log3.230.869iwft wBqktppskhc r For constant flow rate For smoothly changing ratesFor compressible gas in which non-Darcy effects are important,we can use in terms of adjusted pressures:For constant flow rate For smoothly changing rates,2162.6log3.230.869ggga
4、ia wfggt wB qktppD qskhc rsrcktkhBqqDppwtgggggwfaia869.023.3log6.16222,srcktkhBqqDppwtgggggwfaia869.023.3log6.16222,Once we have identified the semilog straight line indicative of themiddle-time region,k is estimated from the m of this line:hmBkgg6.162Non Darcy effect neglected Or the value of D fou
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