油气藏评价与开发
油氣藏評價與開髮
유기장평개여개발
2014年
3期
55-59
,共5页
二氧化碳驱%水气交替驱%混相%采收率
二氧化碳驅%水氣交替驅%混相%採收率
이양화탄구%수기교체구%혼상%채수솔
CO2 displacement%water alternating gas displacement%miscible phase%recovery ratio
以苏北CS油田阜三段油藏岩心为研究对象，进行CO2驱室内试验研究。PVT恒质膨胀试验表明，注CO2气可使地层原油黏度降低78.3%，体积膨胀系数提高69%；细管试验表明，MMP为26.62 MPa小于地层压力29.888 MPa，能够实现CO2混相驱；对比CO2持续气驱、完全水驱后转CO2驱、水气交替这三种驱替方式，长岩心驱替试验表明，在低渗透小断块油藏早期进行水气交替混相驱可延迟CO2突破时间，最终采收率可达80%以上，较水驱提高34.44%，为现场CO2驱替方式的优选提供了依据。
以囌北CS油田阜三段油藏巖心為研究對象，進行CO2驅室內試驗研究。PVT恆質膨脹試驗錶明，註CO2氣可使地層原油黏度降低78.3%，體積膨脹繫數提高69%；細管試驗錶明，MMP為26.62 MPa小于地層壓力29.888 MPa，能夠實現CO2混相驅；對比CO2持續氣驅、完全水驅後轉CO2驅、水氣交替這三種驅替方式，長巖心驅替試驗錶明，在低滲透小斷塊油藏早期進行水氣交替混相驅可延遲CO2突破時間，最終採收率可達80%以上，較水驅提高34.44%，為現場CO2驅替方式的優選提供瞭依據。
이소북CS유전부삼단유장암심위연구대상，진행CO2구실내시험연구。PVT항질팽창시험표명，주CO2기가사지층원유점도강저78.3%，체적팽창계수제고69%；세관시험표명，MMP위26.62 MPa소우지층압력29.888 MPa，능구실현CO2혼상구；대비CO2지속기구、완전수구후전CO2구、수기교체저삼충구체방식，장암심구체시험표명，재저삼투소단괴유장조기진행수기교체혼상구가연지CO2돌파시간，최종채수솔가체80%이상，교수구제고34.44%，위현장CO2구체방식적우선제공료의거。
Focusing on core of Fu-3 section in CS oilfield of Northern Jiangsu, laboratory researches on CO2 displacements were carried out. PVT constant mass swelling tests show that by CO2 injecting, formation crude viscosity reduced by 78.3 % and volume expansion coefficient increased by 69 %. Slime tube tests show that when MMP is 26.62 MPa, less than formation pressure 29.888 MPa, CO2 miscible displacement can be realized. Comparing sustained CO2 displacement, CO2 displacement after completely water displacement and water alternating gas displacement these three displacement modes, long core tests show that water alternating gas displacement in the early stage of low permeability small block can delay the CO2 breakthrough time, so that the ultimate recov-ery can reach above 80 % and was 34.44 % more than flooding. Thereby, it provides references for the optimization of CO2 displace-ment modes.
