超临界二氧化碳和水交替注人井储层内流体的吸附特征研究

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Adsorption Characteristics of Fluid in the Reservoir of Wells njected Alternately by Supercritical Carbon Dioxide and Watel

BAI Yujie*，WEI Haodong，NANXiaohan

MOEKeyLaboratoryforOilandGasRecoverymprovementNortheastPtrolemUniversityaqingHeilongjiang63Chin

Abstract： Inordertostudytheadsorptioncharacteristicsoffluid inthereservoirofwelsinjectedalteratelybysupercritical carbon dioxideand water，the microstructure and mineral compositionofreservoir rocks were analyzed.The molecular model ofstratumrockstructurewasestablishedtostudythefluidadsorptioncharacteristicsofdifferentclayminerals，andthecompetitiveadsorptionandinfluencing factorsofdiferentfluidsontherocksurfacewereanalyzed.Theresultsshowedthatthe compactrocks of Yushulin oillayerin Daqing Oilfieldarecomposed ofsilica matrix andclayminerals such as kaolinite and montmorillonite.The adsorptioncapacityofreservoir minerals forlight hydrocarbons was greater than thatfor heavy hydrocarbons，andadsorptioncapacityfor waterandcarbon dioxide was greaterthanthatforhydrocarbons.Silicondioxidehad the strongestadsorptioncapacityforwaterandcarbondioxide，indicatingthattheoilrecoveryofthereservoirdominatedbysilicon dioxide was higher by using alterate injection flooding ofsupercritical carbon dioxideand water. Intermitent stopinjection could makecarbon dioxideeasierto enter into rock samples and makecrude oileasiertodischarge.The higher temperatures accelerate the exchange ofcrudeoil，waterandcarbon dioxide molecules.Under high pressure，carbon dioxidereacts with crude oil on the rock surface tochange the properties of crude oil，thereby increasing the oil removal rate.

Keywords：competitiveadsorption;tightoil;supercriticalcarbondioxide;water-gasaltermateflooding;moleculardyamics

网络出版地址：http：//link.cnki.net/urlid/51.1718.TE.20250701.1607.004

引言

二氧化碳是一种常见的温室气体，二氧化碳的埋存与利用一直是人们研究的热点问题。（剩余13883字）