欢迎来到天天文库
浏览记录
ID:36663998
大小:751.56 KB
页数:6页
时间:2019-05-13
《钻井液浸泡页岩裂缝宽度的模拟及应用》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、第36卷第5期石油钻采工艺V01_36No.52014年9月0ILDRILLING&PR0DUCTIONTECHNOLOGYSept.2014文章编号:1000—7393(2014)04—0041—06doi:10.13639/j.odpt.2014.04.ol1钻井液浸泡页岩裂缝宽度的模拟及应用康毅力皇凡生游利军俞杨烽练章华(西南石油大学油气藏地质及开发工程国家重点实验室,四川成都610500)引用格式:康毅力,皇凡生,游利军,等.钻井液浸泡页岩裂缝宽度的模拟及应用[J].石油钻采工艺,2014,36(4):41.46.摘要:鉴于我国页岩气开
2、发试验区水平井油基钻井液钻井过程中,频繁出现严重的井壁失稳、井漏等井下复杂情况,选取渝东南龙马溪组露头页岩为实验岩样,开展了钻井液浸泡前后页岩岩石力学性质的测试,基于有限元数值模拟法建立了连通井筒单条垂直裂缝情况下的裂缝动态宽度预测模型,研究了钻井液浸泡后页岩裂缝宽度变化的行为,修正和完善了基于有限元的裂缝动态宽度预测方法,并讨论了裂缝宽度变化模拟在漏失性储层保护和井壁失稳控制方面的应用。结果表明,钻井液浸泡后页岩弹性模量减小,泊松比增加,岩石强度明显降低;钻井液浸泡后页岩裂缝动态宽度对井筒压力变化更加敏感,各裂缝长度和井筒正压差条件下的半缝宽
3、增量均比浸泡前增加了约8%,且半缝宽增量随井筒正压差的增加而大幅度增加,动态缝宽可达数毫米量级;钻井液密度一裂缝宽度一架桥封堵颗粒粒径三者紧密相关。研究获得的裂缝动态宽度参数对优选钻井堵漏材料和粒径级配、控制合理钻井液密度、控制井漏和井壁失稳具有重要的意义。关键词:岩石力学;页岩气;钻井液;井漏;裂缝宽度;数值模拟;威201.H1井中图分类号:TE21文献标识码:ASimulationandapplicationofshalefracturewidthimmersedindrillingfluidKANGYili,HUANGFansheng,Y
4、OULijun,YUYangfeng,LIANZhanghua(StateKeyLaboratoryofOil&GasReservoirGeologyandExploitation,SouthwestPetroleumUniversity,Chengdu610500,China)Abstract:Inconsiderationofthefactthat,duringdrillingofhorizontalwellswithoil—basemudinthepilotareafordevelopmentofshalegasinourcountry~
5、down—holetroubleslikeseverewellboreinstabilityandlostcirculationfrequentlyoccur,theoutcropsofLongmaxishaleinthesoutheastofChongqingweretakenasexperimentalobjectsinordertocarryoutthetestsofshalerockmechani—calpropertiesbeforeandafterimmersionindrillingfluid;basedonfiniteeleme
6、ntnumericalmodel,amodelwasbuiltforpredictingthedynamicfractureundertheconditionofsingleverticalfractureconnectingthewellbore,thebehaviourofshalefracturewidthvariationafterimmersionwasstudied,themethodforpredictionofdynamicfracturewidthbasedonfiniteelementwascorrectedandimpro
7、ved,andtheapplicationoffracturewidthvariationsimulationwasdiscussedtotheprotectionofleakingreservoirsandcontrolofwellboreinstability.Theresultsshowthat,afterimmersionindrillingfluid,theelasticitymodulusofshaledecreased,thePoisson’Sratioincreasedandtherockstrengthreducedsigni
8、ficantly;afterimmersion,thedynamicshalefracturewidthwasmoresensitetochanges
此文档下载收益归作者所有