油井重复压裂工艺技术研究

:(1)(2)(3),(4),,(5)(:;:):19990809;:19990901:,,1983,1995,,,:(710021),:[phone]雷群1张书平1常彦荣2(1长庆石油勘探局钻采工艺研究院,陕西西安长庆兴隆园710021;2长庆石油勘探局采油三厂,宁夏盐池大水坑751506),,:;!;∀;#,;∃80%:TE3572:A:1006-768X(2000)01-0024-04RefracturingtechnologyinOilwellsLEIQun1ZHANGShu-ping1,CHANGYan-rong2(1.DrillingandProductionTechnologyResearchInstitute,ChangqingPetroleumExplorationBureau,Xi%an710021,China;2.TheThirdOilProductionFactory,ChangqingPetroleumExplorationBureau,Ningxia751506,China)Abstract:Therefracturingplaysaveryimportantroleinincreasingoilwellproduction,stabilizingoilfieldproductivityandimprovingtheeconomicbenefitoflowpermeabilityreservoirs.ThispaperanalyzesindetailthereasonthatcausestheproductiondeclineinChangqingOilfield,andconcludedthatadrawdownofformationpressuremightcausetheporositytodeclineandthewatersaturationtoincrease.Basedonthefieldexperienceofrefracturingtechnologyinrecentyears,pointsoutthatthefollowingkindsofwellcouldbeselectedascandidatesforrefracturing:wellswhichareprimarilyfracturedinasmallscale;!wellswhicharefailedduringprimaryfracturedstimulation;∀wellswhicharedamagedduringfirstfracturingstimulation;#wellswhichareprimarilyfracturedwhichbackwardtechniques;∃wellsofwhotheformationpressureisstillabove80%oftheoriginalpressure.Keywords:lowpermeabilitypools,refacturing,declinereason,wellselection1:,,;,&24&DRILLING&PRODUCTIONTECHNOLOGYVol23No1Jan.2000,64+532,1200m~1800m,10m~12m,049∋10-3m2~164∋10-3m2,12%00095MPa/m~00097MPa/m,,6,,,,300m2000,200,3t/d,,221,,,05mm~08mm80%,12216(m)(m)(10-3m2)(%)(m3)(m3/min)(%)(t/d)(m3/d)130015424012516817532015318318501354512422415834821106326()(m3/d)(t/d)(%)(m)(m3/d)(t/d)(%)(m)(m3/d)(t/d)(%)(m)(m3/d)(t/d)(%)(m)310417315116732306231071003282110710632618413910886,1300m,,:1300m32mm24m6/min,500m,315t/d300m,210t/d,333%184t/d,416%263,31311地层致密使油水井连通性差,250m,250m,,312地层压力下降使油层物性进一步变差,,,,,,,,():;,,P0,0,Cf,,P,:=0+Cf0(P-P0)(1),Cf,Newman(1),Cf=13903∋10-3(1+558721)142859612%,Cf=7521∋10-4(MPa-1),12MPa,1MPa,110%,,,,LongBeach(2)50&25&2000年第23卷第1期钻采工艺,,,,,,,,,,!:SW=VWVP(2):SW;Vw;VP:VW=VW0e-CW(P-P0)(3):VW0;CW:VP=VP0eCf(P-P0)(4):VP0,:SW=VWVP=SW0e-(CW+Cf)(P-P0)(5)(5)SwP(5),-(CW+Cf)(P-P0)∗0,,,,,SW,3313生产压差较大形成油相渗透条件变差,,,32,321压裂规模方面,2932293319964,11m314m3,125t/d117t/d,303t/d32t/d,2t/d197t/d,15m3(MPa)(t/d)(t/d)(%)(m)1997613821305765571146199861353117478596116619996933963436431163322压裂液方面:+()+++:30%~40%,!,7%~20%,5%∀,#,,323支撑剂性能05mm~08mm,35%30MPa,199%,92m2&cm620MPa~25MPa,,,,!324其它方面,!,∀,,,441:&26&DRILLING&PRODUCTIONTECHNOLOGYVol23No1Jan.2000:(1)(2),,:,,,,;,!,,,,,42,,;!;∀;#;∃;+;43,199850m3,28m3/min,300m3,500t,,44(m3/d)(t/d)(%)(m)(m3/d)(t/d)(%)(m)(m3/d)(t/d)(%)(m)(m3/d)(t/d)(%)(m)29321921381691239993483421101244731617699928922779118429332712011811559185682648874282782341190305237851118231169129119795652634694954382971931095297232701151,,,5(1);(2),;(3);(4);(5);(6),[1]BCCRAFTandM.F.HAWAKWS.AppliedPetroleumReservoirEngineering.SecondEdition,1990.[2]CraigeW.VanKirk.PetroleumProductionModuleReservoirEngineering.1998.[3]:,1984(:;:)&27&2000年第23卷第1期钻采工艺