准噶尔盆地征10井超深井钻井关键技术  

Key Drilling Technologies for Ultra-Deep Well Zheng 10 in Junggar Basin

作　　者：孙家祥 赵洪山 马莉 Sun Jiaxiang;Zhao Hongshan;Ma Li(Drilling Technology Research Institute,Sinopec Shengli Petroleum Engineering,Co.,Ltd.)

机构地区：[1]中石化胜利石油工程有限公司钻井工艺研究院

出　　处：《石油机械》2023年第5期17-24,共8页China Petroleum Machinery

基　　金：中国石油化工集团股份有限公司科技攻关课题“准中超深层高效钻井关键技术研究”(P22130)。

摘　　要：准噶尔盆地清水河组以深地层不确定因素多、可钻性差、压力体系复杂等问题,严重制约了下组合深探井的勘探开发进程。为此,分析了该盆地征10井深部不同地层的钻井工程难点,开展了井身结构优化设计、异型齿PDC钻头研制、高效井壁稳定钻井液及恒定井底压力钻井等关键技术研究。研究结果表明:形成的下组合深探井配套技术首次在征10井中创造了准噶尔盆地最深钻井(7802 m)的纪录;屋脊齿PDC钻头配套具有长寿命的等壁厚螺杆钻具复合钻井施工,实现了准噶尔盆地腹部深层钻井提速;合成基钻井液能够有效减少因滤液作用造成水敏性地层水化膨胀产生的掉块,是解决准中目的层段井壁失稳、保证井眼质量的首选。研究结果对复杂超深井的钻井提速提效具有重要的指导意义。The strata below the Qingshuihe Formation in the Junggar Basin are found with high uncertainty,low drillability and complicated pressure system,which severely restrains the progress of exploration and development by deep exploration wells in the lower-assemblage reservoirs.Therefore,the challenges in drilling deep layers in Well Zheng 10 were analyzed,and the key technologies were discussed,including optimization of casing program,development of special-shaped-cutter PDC bit,high-efficiency wellbore-stabilizing drilling fluid system and constant-bottomhole-pressure drilling.The results show that,the package of technologies for deep exploration wells in the lower-assemblage reservoir enabled Well Zheng 10 to record the largest well depth(7802 m)in the Junggar Basin.The combination of the ridged-cutter PDC bit and the durable positive displacement motor(PDM)with uniform wall thickness has allowed an enhanced rate of penetration(ROP)in deep layers of the Junggar Basin hinterland.The synthetic-based drilling fluid can effectively suppress wellbore chipping due to hydration swelling of water-sensitive strata induced by drilling fluid filtrate invasion,and it is preferred for avoiding wellbore instability and ensuring wellbore quality in target layers in central Junggar Basin.The research findings provide guidance for the enhancement of ROP and efficiency in complex ultra-deep well drilling.

关 键 词：超深井钻井 井身结构 异型齿PDC 合成基钻井液 恒定井底压力钻井 

分 类 号：TE242[石油与天然气工程—油气井工程]