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1、第38卷第6期石油鉆探技術(shù)VoL38NO.62(J10年11月PEI、R()IE1.JMI)RII1.IN(;I、ECItNIQUESNOV.,20】O.-油藏與開采doi:10.3969/j.issn.1001—0890.2010.06.020儲層潤濕性改變對采收率的影響蘇歡吳新民李文彬(1.中國石油川慶鉆探工程有限公司鉆采工程技術(shù)研究院,陜西西安710021;2.西安石油大學(xué)石油工程學(xué)院,陜西西安710065;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710021)摘要:改變儲層潤濕性是提高原油采收率的重要手
2、段之一,傳統(tǒng)的觀點(diǎn)認(rèn)為:注水開發(fā)時,巖石表層親水更容易使油滴從巖石表面剝落下來。通過天然巖心潤濕性測定和驅(qū)油劑驅(qū)油試驗(yàn)發(fā)現(xiàn),驅(qū)油劑能提高驅(qū)油效率1O左右,驅(qū)油劑并不能將巖石的潤濕性轉(zhuǎn)變成水濕,而是向著中性潤濕的方向發(fā)展。通過分析毛管力發(fā)現(xiàn),在水驅(qū)油到殘余油狀態(tài)時,毛管力是阻力,將阻礙原油從微小的孔隙吼道中流出。由毛管力計(jì)算公式可知,當(dāng)潤濕角為9O。時,毛管力最小。因此得出結(jié)論:中性潤濕最有利于提高采收率;驅(qū)油劑不但能使儲層巖石向中性潤濕發(fā)展,同時能起到降壓增注的作用。關(guān)鍵詞:儲集層;潤濕性;采收率;毛細(xì)管壓力;驅(qū)油效率中圖分類號:T
3、E311文獻(xiàn)標(biāo)識碼:A文章編號:100卜0890(2O10)06-0092—03TheEffectofChangeofReservoirWettabilityonOilRecoverySuHuanWaXinminLiWenbin。(1.ResearchInstituteofDrillingEngineering,ChuanqingDrillingEngineeringCo.Ltd,Xi’an,Shaanxi,710021,China;2.CollegeofPetroleumEngineering,Xi’anShiyouUnivers
4、ity,Xi’an,Shaanxi,710065,China;3.ChangqingUndergroundTechnologyOperatingCompany。ChuanqingDrillingEngi—neeringCo.Ltd,Xi’an,Shaanxi,710021,China)Abstract:Thechangeofwettabilityisoneoftheimportantmeanstoimproveoilrecovery.Itisbe—lievedthatrockhydrophilicsurfaceiSeasiertof
5、laketheoildropletsfromtherocksurfaceunderwater—flooding.Throughtheexperimentsofmeasuringwettabilityandoildisplacement,itisfoundthatoildis—placementagentcanimproveefficiencyby10.Itturnedtherockwettabilityintointermediatewettabilityin—steadofwater-wet.Thoughtheanalysisof
6、capillaryforce,itshowsthatcapillaryforcebecomesresistanceforcewhichpreventsoi】flowingfrommicro-pore-throat~vhenoilsaturationreachesresidualoilsaturationunderwater—flooding.Accordingtothetheoryofcapillaryforce,theforcereachesminimumwhenthecontactingangleis9Ode—gree.Thec
7、onclusionisthatintermediatewettabilityisthemostfavorabletoenhanceoilrecovery,andtheoildis—placementagentnotonlychangethewettabilitybutalsodecreasepressureandincreaseinjection.Keywords:reservoir;wettability;recoveryfactor;capillarypressure;oildisplacementefficiency油層的潤濕
8、性是油田注水開發(fā)中普遍關(guān)注的問題,因?yàn)楫?dāng)水驅(qū)油時,原油采收率的高低、驅(qū)油效果l室內(nèi)試驗(yàn)的好壞在很大程度上與地層巖石的潤濕性有關(guān)l】l。傳統(tǒng)觀點(diǎn)認(rèn)為,在均質(zhì)潤濕系統(tǒng)中,水濕儲層比油濕為了弄清潤濕性對采收率的影響程度,首先測儲層的驅(qū)油效果