Kingfisher区块过断层地应力变化规律及井壁稳定性.pdf

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1、科技导报2013，31(23)研究论文(Papers】Kingfisher区块过断层地应力变化规律邓金根，林海’，胡连波’，陈子剑’，袁俊亮’，刘兆年1．中国石油大学(北京)油气资源与探测国家重点实验室，北京1022492．中海油研究总院。北京100027摘要Kingfisher区块断层发育，钻穿断层时井壁坍塌、钻井液漏失等复杂情况频发。根据子L隙弹性理论及Mohr-Coulomb强度准则，分析了正断层对地应力的影响规律，结合断层对地层力学性质的影响建立过断层时井壁稳定预测模型。结果表明。过正断层后垂直断层迹线水平应

2、力明显增加；断层附近发育断层破碎带，使地层强度降低、坍塌压力升高；过断层时的安全泥浆密度窗口大大减小。为防止断层破碎带发生漏失。应以最小水平主应力作为安全泥浆密度窗口的上限：合理的钻井液密度及优良的封堵性是保证安全钻井的关键。研究结果与Kingfisher区块实钻情况吻合，对Kingfisher区块过断层时的钻井安全具有指导意义。关鲁词断层；地应力；井壁稳定；安全泥浆密度窗口中圈分类号TE21文献标志码Adoi10．3981issn．1000—7857．2013．23．009VariationsofIn-situSt

3、ressandWellboreStabilityforKingfisherBlockThroughtheFaultDENGJingen，LINHai，HULianbo，CHENZijian，YUANJunliang，LIUZhaonian1．StateKeyLaboratoryofPetroleumResourceandProspecting，ChinaUniversityofPetroleum，Beijing102249，China2．CNOOCResearchInstitute，Beijing100027，Chi

4、naAbstractThedevelopmentoffaultsiscommonintheKingfisherblock，causingfrequentlycomplicatedsituations，suchasthewellborecollapse，thedrillingfluidleakageandSOon，intheprocessofdrillingthroughfaults．AccordingtotheporeelastictheoryandtheMohr—Coulombstrengthcriterion，t

5、hispaperanalyzestheinfluenceofthenormalfaultonthein-situstress，which，combinedwiththeinfluenceofthefaultsontheformationandmechanicalproperties，isusedfinallytoestablishapredictionmodelofwellborestabilitythroughfaults．Theresuhsshowthatthehorizontalstressperpendicu

6、lartothefaulttraceincreasessignificantlythroughthenormalfault；meanwhile，thefaultfracturezonedevelopsnearthefault，andreducestheformationstrengthandincreasesthecollapsepressure．Thesafemuddensitywindowofthedrillingfluidisgreatlyreducedwiththefault．Inordertoprevent

7、thedrillingfluidleakageduetothefaultfracturezone，itisnecessarytoconsidertheminimumhorizontalprincipalstressastheupperlimitofthesafemuddensitywindow．Thereasonabledrillingfluiddensityandthegoodsealingprope~yofthedrillingfluidarethekeyofthesafetyofdrilling．Theresu

8、ltsofthestudyprovidesomeguidanceforthesoliddrillingsituationoftheKingfisherblockandthedrillingsafetyoftheKingfisherblockthroughthefault．Keywordsfault；in—situstress；wellbores