吉X井煤层气绒囊钻井液实践.pdf

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1、第33卷第5期石油钻采工艺V01．33No．52011年9月OILDRILLING&PRODUCT10NTECHNOLOCYSep．2011文章编号：1000—7393(2011)05—0093—03吉X井煤层气绒囊钻井液实践王德桂何玉云渊毕延森张毅罗红兵(1．中联煤层气国家工程研究中心有限责任公司，北京100102；2．北京力会澜博能源技术有限公司，北京102200)摘要：吉x井二开井段530．00—616．00m为高压水层，780．00～860．00m井段有80m砾石层，目的层山西组地层压力系数0．55～1．O0，太原组

2、0．67～1．03，不同压力系数共存同一裸眼。采用膨润土钻井液、聚合物钻井液，钻穿高压水层。但聚合物钻井液在密度1．2～1．5g／cm、滴流状态时，仍无法解决砾石层的井壁失稳和岩屑携带问题。钻至井深925．00m后，通井距井底70m无法到底。后改用绒囊钻井液技术，用重晶石加重，密度1．03g／cm。，漏斗黏度90s，12h清洗70m沉砂；密度1．07g／cm。，漏斗黏度70s，顺利钻进到1278m完钻，下套管和固井顺利。绒囊钻井液技术有效地提高了低压目的层承压能力，解决了不同压力系统共存同一裸眼的工程难题。关键词：煤层气；绒

3、囊；钻井液；实践中图分类号：TE254．+3文献标识码：APracticeoffuzzy-balldrillingfluidtechnologyinWellJiXcoalbedmethaneWANGDegui，HEYuyun2BUYuan，BIYansen，ZHANGYi，LU0H0ngbing2，(1．ChinaUnitedCoalbedMethaneNationalEngineeringResearchCenterCo．L以Beijing100102，China；2．BeijingLihuiLabEnergyTechno

4、logyCo．L酰Beijing102200，China)Abstract：Inthesecondopenholebetween530mand616mindepthinWellJi—X，thereisanaqueouslayerwithhighpressure，andbetween780mand860mindepth，thereisagravellayer．TheformationpressurecoeficientofShanxitargetintervalformationisbetween0．55and1．0while

5、theformationpressurecoeficientofTaiyuantargetintervalformationisbetween0．67and1．03．anddif-ferentpressurecoeficientsexistinasall'leopenhole．Bentonite—basedandpolymer—baseddrillingfluidswereappliedinthepenetrationofhighpressurewaterlayer．However,polymerdrillingfluids

6、withdensityof1．2～1．5g／cmandhighviscositycannotmaintaintheholestabilityandcuttingcarryingcapacityinthegravellayerindrillingprocess．Therewasstill70mcannotreachovertheopenholebottomwhilethewellwasonly925mindepth．ThenFuzzy—balldrillingfluidtechnologywasapplied，whichwas

7、weightedbymixingbarites，andthedensitywasincreasedto1．03g／cm；thefunnelviscosityreachedto90s；andthe70mgravelwasremovedin12hourscirculation．Thedrillingreachedto1278mindepthsmoothlywithfuzzy-balldrillingfluid，inwhichthefluiddensitywas1．07g／cmwhilethefunnelviscositywasd

8、ecreasedto70s．Theprocessesofrunningcasingandcementinggowellsubsequently．Loadingbearingcapacityoflow—pressuretargetlayerisgreatlyimprovedandtheeng