煤层气排采动态参数及其相互关系

362Vol.36No.220084COALGEOLOGY&EXPLORATIONApr.2008:2007-12-24:(1970),.:1001-1986(2008)02-0019-051,2(1.,100083;2.,100011):P618.11ADynamicparametersofCBMwelldrainageandrelationshipamongthemYANGXiu-chun1,LIMing-zhai2(1.ChinaUniversityofMiningandTechnology,Beijing100083,China;2.ChinaUnitedCoalbedMethaneCorporation,Beijing100011,China)Abstract:ProductionsystemwhichcontroltheCBMwelloutputfluctuationisakeyfactortoensureproductionsuccessfully.BasedontheproductiondataofPanheCBMdevelopmenttestingarea,acomprehensivestudyin-cludinggasoutput,wateroutput,casingpressureanddynamicwaterlevelwascarriedoutbythemethodofstatisticandantitheses.TheresultshowsthatthereisanobviousphasecharacteristicsforbothCBMproductionprocessanddynamicparameters.IntheprocessofCBMdrainagethedynamicwaterlevelisrelatedtocasingpressure.Thisrelationshipcanbeusedtocontroldownwellpressure.Anadaptiveproductionsystemtodifferentproductionstageswaspointedout,basedoncharactersofdynamicparametersateverystage.Keywords:CBMwellextraction;casingpressure;waterlevel;well-borefluidpressureproductionsystem2005627PH45-0133620062000m3/d13[1]a.[2]·20·36[2]b.c.10a[3]3621PH45-023615d2000m3()1——,,[4]1Fig.1SketchmapofCBMwellproductioncurvefeature1.1—312131.1.1(1)0,1363#1297d15d13#7.92264.2m3221.0m3300m312000m31020m3/d()()1106421m228.1m269.0473.8m364.7m()0281.2m136.6m00.051.66MPa0.57MPa1.1.21(2)13~150d50d11003000m3/d,1012m3/d21564432m3/d1590m3/d578m3/d412.5m3/d7m3/d114m3/d89.22395.33m285.1m157.0m79.6m157.0m0.161.16MPa0.65MPa0.08MPa1.1.3(3)85~398d300d2:·21·7762627m3/d1100m3/d2490m3/d0.54.6m3/d2m3/d25m3/d325.1m39.6m240.0m0.21.7MPa0.78MPa21.210a9895628m3/d3400m3/d32300m3/d1000.8m3/d0.4m3/d31.6m3/d365.1m9.6m340.0m0.51.2MPa0.70MPa32PH45-0222PH45-02Fig.2ThePH45-02wellproductioncurve2.1PH45-020.00480.3045PH=−(1)P,MPaHm33Fig.3Relationshipbetweenwaterlevelandcasingpressure·22·36[5]2.2(4)23PH45-02490d2.3(5)1-234Fig.4Relationshipbetweengasrateandcasingpressure5Fig.5Relationshipbetweenwaterlevelandgasrate2:·23·[6]2.4-[7]-PH45-02(6)1-I23(6)3[8]3.1[9]120m3/d215m3/d32m3/d3.2[10](1m3/d)a.50mb.6Fig.6Relationshipbetweengasrateandwell-borefluidpressure(27)2:·27·4Table4Theresultofmulti-factorregressionanalysis/m3·t−1/m3·t−1/%116.1915.365.1217.9518.523.2315.9515.950411.5711.993.7524.8124.322.0616.2716.551.7720.0820.220.7818.5219.475.1917.1916.166.03GM(0,N)[1].[J].,1995,15(5):1−5.[2].[J].,1997,25(9):45−47.[3],.[J].,2006(7):28−30.[4].[M]//,..:,1996:304−306.[5],,.[J]1995,14(5)27−30[6].[M].:,1992.[7],.[J].,2000(7):69−71.[8],.[J].,1996,14(3):45−49.[9].[J].,1998,16(1):68−70.[10].[J].,1995,13(6):58−61[11],.GM(0N)RBF[J].,2005(5):62−64.[12],,,.[M].,2005.[13],,,.[J].,1996,18(4):1−8.[14].[M].2002.142.[15],,,.[J].,2002,48(3):319−323.(23)4a.1b.c.120m3/d215m3/d32m3/dd.50cm[1].[M]..1998237−238.[2]ROGERSRE.CoalbedMethane:PrinciplesandPractice[J].PrenticeHallPetroleumEngineeringSeries.1994.[3].[J].,200024(2):47−49.[4].[J].,200525(1):124−126.[5].[J].,200525(1):117−119.[6].[J].,200012(1):31−35.[7].[M].:2006.[8].[M]..2007.[9].-[J].,200634(1):21−25.[10]JERRALDL,SAULSBERRY.AGuidetoCoalbedMethaneRes-ervoirEngneering[M].Chicago:USGasResearchInstitut,1996.