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1、致密油藏不同渗流介质应力敏感机理研究[D墟丰I，程林松I薛永超1，李翔龙1，霍啸宇】，蒋丽维2,王翊民彳，侯涛°(1•中国石油大学(北京)石油工程学院，北京102249；2.中国石油大学(北京)地球科学学院，北京102249；3.西安石油大学石油工程学院，陕西西安710065；4.中国石油华北油出山西煤层气勘探开发分公司地质研究所，山西晋城048000)摘要：为了能够正确评价致密油藏实际生产过程中的应力敏感特征，本文针对致密油藏岩心，以油藏初始有效应力为起点，模拟油□实际开发过程中由于地层压力变化引起的有效应力变化，
2、从渗透率损失程度和恢复程度两方面评价应力敏感。由于铁方解石和石英的支撑作用以及允许液体通过的喉道半径下限值的存在，致密油藏气测应力敏感渗透率的损失程度与恢复程度均随着气测渗透率的降低而增大，液测应力敏感渗透率损失程度和恢复程度随着气测渗透率的降低先增大后减小，最终出现不恢复的现彖。同时，渗透率损失程度和恢复程度在气测与液测Z间的差异性都与气测渗透率呈负和关关系。关键词：致密油藏；不同渗流介质；应力敏感；喉道半径下限值中图分类号：TE312文献标志码：AStudyonthestresssensitivitymechan
3、ismofdifferentfluidsintightoilreservoirTianXiao・feng1,ChengLin-song1,XueYong-chao1,LiXiang-long1,HuoXiao-yii1,JiangLi-wci2,WangYu-min3,HouTao4(1.PetroleumEngineeringDepartmentinChinaUniversityofPetroleum,Beijing102249,China;2.CollegeofGeosciencesinChinaUniversi
4、tyofPetroleum,Beijing102249,China;3.PetroleumEngineeringDepartmentinXi'anShiyouUniversity,Xi'an710065,China;4.InstitutcofGeology,CBMExplorationandDevelopmentBranch,PetroChinaHuabeiOilfieldCompany,Jincheng048000,China)Abstract:Inordertoevaluatethestresssensitivi
5、tyoftightoilreservoirduringdevelopmentcorrectly,sevenexperimentsusingcoresfromthetightoilreservoirwhosepenneabilityislessthan0.1X10"pnrwereconducted.Theseexperimentswerebasedontheinitialeffectivestressofthetightoilreservoirandsimulatedthechangeofeffectivestress
6、resultingfromreductionandriseoftheformationpressure.Thedegreeofdamageandrecoveryforpermeabilityaretheevaluationindex.Duetothesupportofferrocalciteandquartz,thedegreeofdamageandrecoveryforgaspermeabilityarebothincreasingasthecoresbecometighte匚Inaddition,consider
7、ingthethroatradiusbelowwhichnoliquidcanflow(rm),thedegreeofdamageandrecoveryforliquidpermeabilityincreaseinthebeginningandthendecreasewiththegaspermeabilityofthecoresdecreasing・Atworst,theprocessofrecoveryforliquidpermeabilitywoulddisappearwhenthegaspermeabilit
8、yisdramaticallylow.Moreover,thedifferenceinthedegreeofdamageandrecoveryforpermeabilitybetweenmeasuredbygasandliquidhasnegativecorrelationswithgaspermeability.Keywords:tighto
