东秋X井高压气层窄密度窗口固井技术  

Technology for Cementing High Pressure Narrow Density Window Gas Zones in Well Dongqiu-X

作　　者：赵凌霄[1,2,3] 王春才 叶素桃 邹双 王健栋 王彪 ZHAO Lingxiao;WANG Chuncai;YE Sutao;ZOU Shuang;WANG Jiandong;WANG Biao(CNPC Tianjin Bo-Xing Engineering Science&Technique Limited Company,Tianjin 300451;Key Laboratory of Drilling Engineering,CNPC,Tianjin 300451;National Engineering Research Center of Oil&Gas Drilling and Completion Technique,Tianjin 300451;CNPC Tarim Oilfield Company,Korla,Xinjiang 841000)

机构地区：[1]天津中油渤星工程科技有限公司,天津300451 [2]CNPC钻井工程重点实验室固井技术研究室,天津300451 [3]油气钻完井技术国家工程研究中心固井实验室,天津300451 [4]中石油塔里木油田油气工程研究院,新疆库尔勒841000

出　　处：《钻井液与完井液》2024年第5期661-667,共7页Drilling Fluid & Completion Fluid

摘　　要：东秋X井是部署在塔里木盆地库车坳陷秋里塔格构造带上的一口预探井,五开采用Φ215.9 mm钻头、密度为2.17 g/cm^(3)钻井液钻至井深6130 m中途完钻,钻进期间发生多次漏失且裸眼段有多套油气显示,压稳防漏矛盾突出,安全密度窗口仅为0.06 g/cm^(3),固井过程中极易出现恶性漏失,甚至还会发生由漏转喷等复杂。通过采用精细控压固井技术强化井筒压力控制,使用韧性自愈合水泥浆保障井筒长期完整性,配套带顶封尾管悬挂器辅助密封等技术措施,顺利完成东秋X井固井施工,经CBL/VDL测井解释固井质量合格率为94.3%,六开降钻井液密度后钻进及完井正常,未见环空带压等异常情况。该技术解决了窄密度窗口高压气井溢漏同存的难题,并可保障封固井段的初次固井质量和长期密封完整性,可为窄窗口高压气井、复杂井的固井技术提供参考。The well Dongqiu-X is an exploration well drilled in the Qiulitage tectonic zone of the Kuche sag in the Tarim Basin.The fifth interval of the well was drilled to a depth of 6,130 m withΦ215.9 mm bits and a drilling fluid of 2.17 g/cm^(3),and was prematurely completed at that depth.During drilling mud losses occurred several times and oil and gas shows in the open hole section were encountered at different depths.Oil/gas kick and mud losses coexist in the same interval,with safe drilling window of only 0.06 g/cm^(3),meaning that severe losses of cement slurries during well cementing are prone to happen,and the losses of cement slurries may induce well blowout.To deal with this problem,precise pressure control while drilling was adopted to safely control the wellbore pressure,and a tough self-healing cement slurry was used to ensure the long-time integrity of the wellbore.The well Dongqiu-X was successfully cemented using the self-healing cement slurry combined with the use of liner hanger with top packer for auxiliary sealing.CBL/VDL logging results showed that the percent qualified cementing job was 94.3%.When the sixth interval was drilled with a mud of lower density,the drilling operation and the well completion operation were all successfully conducted,and no pressure trap in the annular space was found.The use of the well cementing technology has successfully solved the difficulties encountered in drilling high pressure gas well.

关 键 词：高压气井 窄密度窗口 精细控压固井 韧性自愈合水泥 带顶封尾管悬挂器 

分 类 号：TE256.3[石油与天然气工程—油气井工程]