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时间:2020-06-06
《沁水盆地南部煤层气井压裂失败原因分析.pdf》由会员上传分享,免费在线阅读,更多相关内容在应用文档-天天文库。
1、第40卷第6期煤炭科学技术Vo1.40No.62012年6月CoalScienceandTechnologyJune2012沁水盆地南部煤层气井压裂失败原因分析刘世奇,桑树勋,李仰民,李梦溪,刘会虎,张建国(1.中国矿业大学资源与地球科学学院煤层气资源成藏过程教育部重点实验室,江苏徐州2211162.华北油田公司L【I西煤层气分公司,山西晋城048000)摘要:依据煤层气井压裂施工的工艺参数,以沁水盆地南部12口煤层气井压裂施工失败为例,分析了沁水盆地南部煤层气井压裂失败的主要控制因素,研究认为:井口刺漏、高
2、压停泵和煤储层力学性质是沁水盆地南部煤层气井压裂施工失败的主要控制因素;井口刺漏主要是由施工压力过高、井口老化造成的;高压停泵主要是由砂堵引起的,井口刺漏、高压停泵与砂堵之间相互影响及促进:砂堵受施工工艺及地质因素的影响;研究区煤储层具有低弹性模量、高泊松比的特点,地层开启难度大且裂缝难以延伸;压裂施工前,应做好煤储层特征的研究、压裂设备的选择、压裂S-艺的设计等,减少工程事故的发生。关键词:煤层气井;水力压裂;砂堵;刺漏;高压停泵;沁水盆地南部中图分类号:P618.11文献标志码:A文章编号:0253—23
3、36(2012)06-0108-05AnalysisonFracturingFailureCauseofCoalBedMethaneWeUinSouthPartofQinshuiBasl’nLIUShi—qi,SANGShu—xun,LIYang-min,LIMeng-xi,LIUHui—hu,ZHANGJian—guo(1MOEKeyLabofCoalBedMethaneResourcesandDepositProcess,SchoolofResourcesandGeosciences,ChinaUnive
4、rsityofMiningandTechnology,Xuzhou221116,China;2.ShanxiCoalBedMethaneBranch,HuabeiOi忸ldCompany,Jincheng048000,China)Abstract:Takingthetechnicalparametersofthefracturingoperationsinthecoalbedmethanewellasthebasisandtakingthefracturingfailuresofthe12coalbedmet
5、hanewellsinsouthpartofQinshuiBasinasanexample,thepaperanalyzedthemaincontrolfactorsofthefracturingfailuresofthecoalbedmethanewellsinsouthpartofQinshuiBasin.Thestudyheldthatthetabbingleakageofmineshafthead,thestopofthehighpressurepumpandthemechanicspropertyo
6、fthecoalseamwouldbethemaincontrolfactorsofthefracturingfailureinthecoalbedmethanewellsofthesouthpartofQinshiBasin.ThestabbingleakageofthemineshaftheadwascausedbytheCOIl—structionpressuretoohighandtheagingofthemineshafthead.Thestopofthehighpressurewasmainlyc
7、ausedbythesandjanlmed.Thereweremutualinfluencesandpromotionbetweenthestabbingleakageofthemineshafthead,thestopofthehighpressurepumpandthesandjanlmed.Thesandjammedwouldbeaffectedbytheconstructiontechnologyandthegeologicalfactors.Thecoalseamsinthestudyareawou
8、ldhavethefeaturesofthelowelasticmodulesandhighPoisson’sratio.Thestratawouldhavehighdifficultinexcavationandthecrackwouldbedifficulttobeexpanded.Beforethefracturingconstruction,thestudyonthecoalseamfeat
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