含泥砂岩储层水力压裂裂缝起裂及延伸规律.pdf

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1、Aug．，20122012年8月大庆石油地质与开发Vol_31No．4第3l卷第4期PetroleumGeologyandOilfieldDevelopmentinDaqingDOI：10．3969／J．ISSN．1000-3754．2012．04．022含泥砂岩储层水力压裂裂缝起裂及延伸规律王贤君李存荣韩露(大庆油田有限责任公司采油工程研究院，黑龙江大庆163453)摘要：含泥砂岩储层是海拉尔油田主力油层之一，由于含泥砂岩具有一定的弹塑性，其裂缝起裂及延伸有别于砂岩储层，所以压裂成功率仅为70％左右。为进一步提高压裂成功率，对不同泥质质量分数条件下岩石的应变关系

2、进行了研究，根据不同泥质质量分数条件下裂缝起裂及扩展准则，利用有限元分析软件建立含泥地层裂缝起裂及延伸的力学模型，通过模拟分析不同泥质质量分数条件下地层的破裂压力和裂缝延伸的特点，认清了含泥及砂泥互层情况下裂缝起裂及延伸规律。模拟结果表明，高含泥砂岩储层往往需要提供更高的起裂压力和延伸压力，为该类储层水力压裂的优化设计提供了依据。关键词：含泥砂岩储层；泥质；裂缝起裂；延伸规律；有限元中图分类号：TE357．11文献标识码：A文章编号：1000-3754(2012)04-0107-03HYDRAULICFRACTUIUNGINITIATIoNANDPRoPAGATI

3、oNLAWSFoRMUD．BEARINGSANDRESERVoIRSWANGXianjun，LICunrong，HANLu(ResearchInstituteofOilProductionEngineeringofDaqingOitfiadCompanyLtd．，Daqing163453，China)Abstract：Mud-bearingsandstonereservoirsareoneofthemainoi1layersinHailarOilfield，justbecauseofthee—lastic—plasticcharacteristicsofthisk

4、indofreservoirs，theirfractureinitiationandpropagationaredifferentfromsandstoneones，thesuccessratiooftheirhydraulicfracturingisonlyabout70％．Inordertoenhancethesuccessratiooffracturing。thestrainrelationoftheshalyrocksiSstudiedundertheconditionsofdiferentmassfractions．Accordingtotherules

5、ofthefractureinitiationandpropagationundertheaboveconditions，andfurthermorewiththehelpofthefiniteelementanalyzingsoftware，themechanicalmodelisestablishedforthefractureinitiationandpropagationofmud-beatingformation．Throughsimulatingandanalyzingthecharacteristicsofthebreakdownpres—surea

6、ndfracturepropagationofthemud-bearingformationundertheconditionsofdifferentmassfractionsthelaws，ofhydraulicfracturinginitiationandpropagationarewellrecognizedformud．bearingandsand．shaleinterbeds．Thesimulationresultsshowthatforhighmud—bearingsandstonereservoirsitisoftenrequiredtoprovid

7、ehigherhydraulicfracturinginitiationandextensionpressures，thustheachievementsabovehavepresentedtheevidenceforthehy-draulicfracturingoptimizationofthiskindofreservoirs．Keywords：mud—bearingsandstonereservoir；shaly；fractureinitiation；propagationlaw；finiteelement收稿日期：2011-08．12改回日期：2012-0

8、1．12基