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时间:2019-05-22
《煤层气钻井井壁失稳机理及防塌钻井液技术》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41卷第2期煤田地质与勘探V_01.41NO.22013年4月COALGB0]L()GY&嘲01oNApr.2013文章编号:1001-1986(2013)02—0037—05煤层气钻井井壁失稳机理及防塌钻井液技术黄维安,邱正松,杨力,王彦祺,马永乐一,王宗敏(1.中国石油大学石油工程学院,山东青岛266580;2.华东石油局工程技术设计研究院,江苏南京21003l;3.天津中油渤星工程科技有限公司,天津塘沽300451)摘要:针对沁水盆地煤层气钻井中存在的井壁稳定技术难题,采用x射线衍射、扫描电镜、泥页岩膨胀实验、页岩分散
2、实验测试了泥页岩和煤岩体的组构及理化性能,分析了井壁失稳机理。依据“多元协同”防塌原理,研选出了高效包被抑制剂、封堵防塌剂和活度平衡剂,构建了泥页岩地层防塌钻井液体系QSFT和煤层钻开液QSMZ。评价结果表明,QSFT体系的粘度、切力适中,滤失量低、泥饼薄,对200¨m裂缝的封堵承压能力达3.0MPa;QSFT和QSMZ具有较强的抑制水化能力,并能显著增加岩样单向抗压强度,对煤岩体岩心湿测渗透率的损害均低于30%,干测渗透率恢复值达到95%以上,可作为沁水盆地煤层气井的钻井液和储层钻开液。关键词:煤层气;井壁失稳机理;抑制性;
3、钻井液;储层保护中图分类号:TE254文献标识码:ADOI:10.3969~.issn.1001—1986.2013.02.009Instabilitymechanismofsidewallandanti—sloughingdrillingfluidtechniquef0rcoalbedmethanewelldrillingHUANGWeian,QIUZhengsong,YANGL,WANGYanqiz,MAYongle,W:ANGZongmin~(1.SchoolofPetroleumEngineering,ChinaUni
4、versityofPetroleum,Qingdao266580,China;2.ResearchInstituteofEngineeringTechniqruesandDesign,PetroleumBureauofEastChina,Nanjing210031,China;3.TianjinBo-XingEngineeringScience&TechnologyCo.Ltd.,CNPC,I~anjin30045l,China)Abstract:Aimedatthetechnologicalproblemofsidewall
5、instabilityinQinshuibasin,thefabricandphysicalchemicalpropertiesofmudshaleandingredientweretestedbyX—raydiffraction(XRD),ScanningElectronMi-croscope(SEM),linerswellingtestandhotrollingdispersionexperiments,andtheinstabilitymechanismwasanalyzed.Accordingtothemultivar
6、iatecooperationprincipleforwellborestabilization,thehighperformancecoatinginhibitor,plugginganti·sloughingagentandactivityequalizerwerepertinentlyselected,andtheanti-sloughingdrillingfluidsystem(QSFT)formudshalestratumanddrillingfluidforcoalseams(QSMZ)wereformed.Eva
7、luationresultsshowthattheQSFTsystemhasexcellentviscosity,lowfluidloose,thinmudcake,pluggingandbearingcapacitywasupto3.0MPaforfissuresof200Ixm;QSFTandQSMZhavestronghydratein-hibition,canincreaseuniaxialcompressivestrengthofrocks,permeabilitylossratiosofwetingredientc
8、oresarelowerthan30%,andpermeabilityrecoveryratiosofdrycoresarehigherthan95%.Theycanbeusedascoalbedmethanewelldrillingfluidanddrillingfluid
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