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1、第43卷第3期石油鉆探技術(shù)Vo1.43No.32015年5月PETR0LEUMDRILLINGTECHIXIIQUESMay,2015..鉆井完井doi:10.11911/syztjs.201503013低滲透老油田新型多縫重復(fù)壓裂技術(shù)研究與應(yīng)用達(dá)引朋,陸紅軍,楊博麗。,李轉(zhuǎn)紅,白曉虎(1_中國石油長慶油田分公司油氣工藝研究院,陜西西安710018;2.低滲透油氣田開發(fā)國家工程重點實驗室,陜西西安710018;3.中國石油川慶鉆探工程有限公司長慶井下技術(shù)作業(yè)公司,陜西西安710018)摘要:鄂爾多斯盆地長X儲層受儲層物性、壓裂裂縫等因素影響,注水開發(fā)驅(qū)替效果較差,
2、大量剩余油分布于人工裂縫兩側(cè)難以動用。為了充分動用裂縫側(cè)向剩余油,提高油井單井產(chǎn)量和采收率,按照“控制縫長+多縫+提高剩余油動用程度”的技術(shù)思路,通過數(shù)值模擬計算,提出并試驗形成了以“增加裂縫帶寬、產(chǎn)生轉(zhuǎn)向新裂縫”為增產(chǎn)機理,以“縫內(nèi)暫堵、增大排量、適度規(guī)模和低黏液體”為模式的老井新型多縫重復(fù)壓裂技術(shù)?,F(xiàn)場試驗表明,與常規(guī)壓裂相比,該壓裂技術(shù)裂縫帶寬增大21m,改造體積增大148,平均單并增油量為常規(guī)壓裂的1.9倍,取得明顯的增產(chǎn)效果,為長慶油田低滲透儲層老井重復(fù)改造提供了新的技術(shù)手段。關(guān)鍵詞:低滲透油氣藏老井重復(fù)壓裂單井產(chǎn)量中圖分類號:TE357.1文獻標(biāo)志碼:
3、A文章編號:1001—0890(2015)03—0065—06ResearchandApplicationofNewRefracturingTechnologyinLowPermeabilityOilfieldDaYinpeng一,LuHongjun一,YangBoli。,LiZhuanhong一,BaiXiaohu一,(1.OilandGasTechnologyInstitute,PetroChinaChangqingOiZfieldCompany,X’an,Shaanxi710018,China;2.NationalEngineeringLaboratoryf
4、OrExplorationandDevelopmentofLo~-Permea—bilityOiZ&GasField,Xi’an,Shaanxi,710018,ina;3.ChangqingDownholeOperationCompany,CNPCChuanqingDrillingEngineeringCo.,L.,Xi’an,Shaanxi,710018,China)Abstract:ProductionfromtheChangXreservoirofthe0rdosBasinhasbeendecliningduetothepetrophysicalproper
5、tiesoftheproducingformation,inducedfractures,andotherfactors,andthedisplace—menteffectwithwater.Asaresult,thereiS1argeamountofremainingoildistributedatbothsidesofin—dueedfractures,anditisdifficulttotap.Tooptimallyrecovertheremainingoil,improveoutputandrecov—ery.a(chǎn)ccordingtotheconceptof
6、“contro1offracture1ength+multi—fracturefracturing+tapmuchremai—ningoil”。thispaperpresentsanewmulti—refracturestimulatingtechnology(NMST)throughnumericalsimulation,whichcanincreasefracturewidth,createnewfracturesindifferentdirections,andtakesuchmeasuresastemporaryplugginginsidefracture
7、,raisingflowrateproperly,usinglowviscousfluids,etc.Fieldtestingshowsthatthesingle-welldailyaverageoutputis1.9timesthatofconventionaltechnology,fracturebeitandfraeturedformationvolumeincreasedby21mand148respectively.TheNMSTpro—videsanewwaytoimproverecoveryofoilinthelow-permeabilityrese
8、rvoir