气藏工程气藏工程气藏工程 (21).pdf

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1、5.1 Types and Purposes of Pressure 5.1 Types and Purposes of Pressure Transient TestsTransient Tests1 Definition of Pressure-Transient TestPressure-transient test:A test in which wegenerate and measure pressure changesin a well as a function of time.testAnalyzeImput signal(rate change)output signal(

2、pressure change)output signal(pressure change)Pressure AnalysisReservoir parametersReservoir modelSystem(reservoir)2 Types of Pressure-Transient AnalysisAccording to Test method:（1）flow test,fall off(injectivity)（2）build up testSingle well testMultiwell test（3）interference test（4）pulse well testflow

3、 test,fall off(injectivity)Producer:flow test 0tQ0t0tInjector:fall-off test q-qpwfpwfBuildup test00ttQPwInterference testtoproducefromonewell,called the active well,and observethe pressure response in one,ormore offset wells or observationwells.ACB BD pulse well testto alternate production of openwe

4、ll and shut in of the active well,so aseries of periodic changes has beenformed.ACB BD2 Types of Pressure-Transient AnalysisAccording to different well type(1)Vertical well(2)Horizontal well(3)Fractured vertical well(4)Fractured horizontal well(5)Other complex well types(directional well,multilatera

5、lwell,et.al)2 Types of Pressure-Transient AnalysisFrom Interpretation method conventional well test interpretation method Modern well test interpretation method Numerical well test interpretation method conventional well test interpretation method1950s1960sHorner method:using radical flow data to an

6、alyze straight line of logt vs pwf.20.1830.1832.25 ()lglgiwfwq BqpppttKhKhr 0tpwf Modern well test interpretation methodLog-Log plot:dp and dp psi vs dt hr1970s1970s1981980 0s sMatch type curves and automatic match by computer using log-log plot.In 1969，Ramey type curves;Gringartentype curves.In 198

7、2，Bourdet type curves with pressure and pressure derivative10102 210103 310104 410105 510106 610107 710108 81010-1-110100 010101 110102 2t tDD P PwwD DCD=0CD=102CD=103CD=104CD=105S=-5S=0S=5S=10S=20 Numerical well test interpretation method1990s-,to solve the complex problems such as multilayers,mult

8、iphase,complex boundary,complex well type.（SaphirSaphir）Estimate the initial reservoir pressure,or average reservoir pressure;Estimate the flow capacity of fluid in the reservoir;Determine the effect of stimulation measures and the extent of formation damage;3 Principal Objectivesippks locate the position of boundaries discontinuities;Estimate the gas initial in place.3 Principal ObjectivesdG5.1 Types and Purposes of Pressure Transient Tests（End)