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时间:2020-05-01
《双组份岩石压缩系数推导与试验验证.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第34卷第5期岩土力学Vo1.34NO.52013年5月RockandSoilMechanicsMay2013文章编号:1000-7598(2013)05—1279-08双组份岩石压缩系数推导与试验验证蒋雨江,李闽,薛潇妮,肖文联(西南石油大学油气藏地质及开发工程国家重点实验室,成都610500)摘要:岩石压缩系数一直是油藏工作者研究的热点问题,近年来黏土矿物的特殊性质对岩石压缩系数的影响已成为人们关注的重点。将岩石视为“骨架+黏土”的双组份模型,从岩石压缩系数定义出发,运用弹性力学理论,推导出双组份岩石压缩系数公式,
2、得到岩石压缩系数与黏土含量及黏土力学性质的理论关系。以大牛地气田含黏土砂岩为对象,通过岩石变内压三轴压缩试验实测岩石压缩系数,并同时进行岩石的微观试验研究。计算出双组份压缩系数公式及其他几种不考虑黏土的传统压缩系数求解方法对应的岩石压缩系理论值,将理论值与岩石压缩系数实测值进行对比分析,结果发现,双组份岩石压缩系数理论值与实测结果更接近,说明了考虑黏土影响的双组份岩石压缩系数理论的合理性,该理论为油气储层岩石压缩系数的预测开拓了新的思路。关键词:压缩系数;黏土;双组份模型;微观试验中图分类号:TE311文献标识码:AC
3、ompressibilityderivationandexperimentalverificationoftwo-componentrockJIANGYu-jiang,LIMin,XUEXiao—ni,XIAOWen-lian(StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,SouthwestPetroleumUniversity,Chengdu610500,China)Abstract:Therockcompressibilityhasalwa
4、ysbeenthefocusofreservoirworkers;andtheinfluenceofclaycharacteristicsontherockcompressibilitygetsmoreattentioninrecentyears.Rockisregardedastwo—componentmodel‘clay+matrix’,basedondefinitionofrockcompressibilityandtheoriesofelasticmechanics,two—componentrockcompr
5、essibilityformulaisderived;thusthetheoreticalrelationshipbetweentherockcompressibilityandcontentofclayaswellasthemechanicalpropertiesofclayhasbeenfound.Clay-containingsandstonecoresfromDaniudigasfieldareregardedastheresearchobjects,thecompressibilitiesofthesecor
6、esaremeasuredbytriaxialcompressionexperimentwithvariableinternalpressures,themicro—experimentalstudyiscarriedoutsimultaneously.Theoreticalvaluesofcompressibilityofthesecoresareobtainedbyusingthetwo—componentrockcompressibilityformulaaswellastheothertraditionalma
7、thematicalmethodswhichdonottakeclayintoconsideration.Bycomparisonamongthetheoreticalvaluesofcompressibilityofdifferentmathematicalmethodsandthemeasuredones.two.componentrockcompressibilityisprovedtheclosesttotheexperimentalresult,whichindicatestherationalityofth
8、eoryoftwo—componentrockcompressibility,thistheorydevelopsanewidealforpredictingthereservoircompressibility.Keywords:compressibility;clay;two—componentmodel;micro—expe
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