空气动力洗井技术在煤层气井中的应用与评价

第44卷第2期煤田地质与勘探Vol.44No.22016年4月COALGEOLOGY&EXPLORATIONApr.2016收稿日期:2014-09-11基金项目:(41002047)FoundationitemNationalNaturalScienceFoundationProjectofChina(41002047)作者简介:(1986)[e-mail]引用格式:.[J].201644(2)134–140.WANGShaoleiLINXiaoyingSUXianboetal.ApplicationandevaluationofthewellflushingtechnologywithcompressedairinCBMwells[J].CoalGeology&Exploration201644(2)134–140.文章编号:1001-1986(2016)02-0134-07空气动力洗井技术在煤层气井中的应用与评价王少雷1,4，林晓英1,2，苏现波1，王怀3，范超1，苏黎楠1(1.河南理工大学能源科学与工程学院，河南焦作454000；2.河南能源化工集团研究院有限公司，河南郑州450046；3.河南省煤田地质局二队河南洛阳471023；4.贵州天然气能源投资股份有限公司，贵州贵阳550000):煤层气地面开发过程中，由于排采不当，支撑剂、煤岩粉沉淀，造成井壁或压裂裂缝堵塞，直接影响煤层气的排采。对于这类煤层气井常需要对其进行清洗和疏通。通过对井筒周围裂缝的力学分析，给出了空气洗井系统参数设计的计算模型，并简要介绍了在煤层气井中的空气动力洗井的设备和工艺，以及对洗井效果参数的选择和计算。利用该技术在ZM-1井组中进行了实际应用，有效地解决了ZM-1井堵塞、产气量低等问题。这一空气动力反循环洗井技术的应用，对探索煤层气井的高产高效开发提供了新的途径。：空气动力洗井；设备；工艺；注气参数；效果检验：P618.13：ADOI:10.3969/j.issn.1001-1986.2016.02.024ApplicationandevaluationofthewellflushingtechnologywithcompressedairinCBMwellsWANGShaolei1,4，LINXiaoying1,2，SUXianbo1，WANGHuai3，FANChao1，SULinan1(1.SchoolofEnergyScienceandEngineering,HenanPolytechnicUniversity,Jiaozuo454000,China;2.HenanEnergyandChemicalIndustryInstituteGroupCo.,Ltd,Zhengzhou450046,China;3.theSecondExplorationTeam,HenanBuranofCoalGeologicalExploration,Luoyang471023,China;4.GuizhouNaturalGasEnergyInvestmentCo.,Ltd,Guiyang550000,China)Abstract:InthedevelopmentofCBMwellsontheground,proppantandcoalpowderaresedimentedbecauseofunreasonabledrainage,resultinginblockingwallorfractures,whichaffectsdirectlythedrainageofcoabedmeth-ane.Inordernottoaffectthesustainableandefficientproduction,suchawellmustbecleanedanddredged.Throughthepreliminarymechanicalanalysisofthewellboreandfractures,acalculationmodelofairflushingsys-temforparameterdesignwasgiven,theequipmentandprocessesofflushingwithcompressedairinCBMwell,theparametersselectionandcalculationofeffectofwashingwellwere.brieflyintroduced.ThistechnologywasusedinthegroupofwellsZM-1toeffectivelysolvetheblockageandlowgasproduction.Thesuccessofreversecircu-lationwellwashingtechnologywithcompressedairinthewellsZM-1providedanewwayforexploringthehighlyproductiveandefficientdevelopmentofCBMwells.Keywords:wellflushingwithcompressedair;equipment;technology;parametersofairinjectioneffecttest[1]第2期王少雷等:空气动力洗井技术在煤层气井中的应用与评价·135·[2][3]1空气动力洗井技术()()(1)1Fig.1Wellwashingwithreversecirculation1.1()(2)21MPa2~4MPa7a.b.c.d.e.f.()()g.1.2[4][5]()FGFA[6]3RsRv315Gsfs4π()103FgR(1)sg/cm3fg/cm3g·136·煤田地质与勘探第44卷2Fig.2Equipmentconnection3Fig.3Mechanicalanalysisofpulverizedcoalinwallofcoal-bedmethaneborehole2s6π(1)()FRAHFH(2)FxFy2s19πsin(1)()sxRAvFHFHR(3)3ss29πcos(1)()yRAvFHFHR(4)Fx≥0(FG-Fy)214As2222ss111.1310FDRRDRRDRR(5)μ0[7]RsμmRμmFGNFANμPa·sH=d/RsdmAsF1(H)=[0.7431/(0.6376–0.2001ln(H))]/HF2(H)=3.23θD=R+Rs+d22πAqAHamaker[6]vν1()[7]s2GA1222ss12cos9π1()sin(1)()cosRFFvμRAHFHRRHFH(6)νν1νc()νs()[8-9]((7))(8)2/vp(7)22vp(8)ρkg/m3pMPavm/s[10-11]pp0.03845dkLZTppe(9)dpMPakpMPaγkg/m³L第2期王少雷等:空气动力洗井技术在煤层气井中的应用与评价·137·mZpTpK(Tp=(Tc+T0)/2)TcT0)molMPVRTnRTM(10)nR00pk0kPVTVTP(11)V0m3Vkm3T0KP0MPa(10)(11)1.3()[12]11225.45rdvkr(12)ν2m/sd1md1≤0.02mr1kg/m3r2kg/m3kk≥1Q22zz20.785-60QDdv(13)Qm3/minDzmdzm2洗井效果检验2.1[13-14]K=3scpp7.310gqTBmhP(14)K10–3μm2qsc104m3/dμpMPa·sTKBgmhmPpMPa2.2seserz=πiDvh(15)ivim3rzrwse[13]wzlnrsr(16)rzmrwms3空气动力洗井技术在ZM-1井中的应用3.1ZM-1ZM-1U(476480m400mm)(5m)300m5m(4)ZM-1ZM-1-HZM-1-VZM-1-V1ZM-1-V13.90m33.2/·138·煤田地质与勘探第44卷(6)νc0.41m/sνs0.44m/s(8)1.02~3.33MPa3MPa(2)3.34(5)(m)4ZM-1Fig.4ThestructureofwellsZM-1表1ZM-1井煤储层参数Table1ThereservoirparametersofwellsZM-1/m/(m3·t–1)/MPa/(MPa·m–1)/MPa/MPa/MPa/(kPa·m–1)/10–3m2//(MPa·m–1)1482489.81820130.0256.5248.750.002320.460.013表2空气动力清洗储层注气质量表Table2Qualityofinjectedairofflushingwithcompressedair/K/MPa/m3/min/(m3·min–1)/MPa/K/m3/m3293.150.1448459762.60341.15200.701872297.150.1752499762.00334.15423.044093300.150.1319242761.96331.15179.681664298.150.1410454762.00333.15229.292155295.150.1456060762.02335.15256.9724316294.150.1456060761.98332.15260.052461295.150.1516868761.77336.15332.543192294.150.1456060761.73335.15300.322863294.150.1440858761.70335.15296.1328224293.150.1342045761.97332.15196.701831293.150.1387651762.01338.15222.032082294.150.1319242762.00337.15182.931693295.150.1410454762.03339.15232.312184296.150.1319242761.95337.15186.351725300.150.1136818761.70336.1590.1276.26302.150.1182424761.66332.15120.791077300.150.1197626761.66334.15132.6811938295.150.1136818761.60330.1595.6481.71299.150.13180301062.20334.15161.4614842300.150.110282971062.20340.15529.65516第2期王少雷等:空气动力洗井技术在煤层气井中的应用与评价·139·54Fig.5Logarithmiccurvesofpressureandtimeofairinjectionforfourtimesofwellwashing3表3洗井效果检验参数Table3Parametersofeffecttestofwellwashing/MPa/10–3m2/m0.922.260.482.80–3.4510.442.021.173.24–3.5920.251.842.343.34–3.6230.211.862.732.41–3.2840.122.123.933.57–3.643(6)4846Fig.6Curveofpermeabilityvariationwiththetimesofwellwashing4结论a.“”·140·煤田地质与勘探第44卷b.c.ZM-1-V8ZM-1参考文献[1].[J].2014(1)129131.WANGDarui.Theresearchofwaterinjection