摘要
五探1井是部署在四川盆地川东地区下古生界-震旦系勘探新领域的一口重点风险探井,完钻井深8060 m。该井六开采用?190.5 mm钻头从6600 m钻进至7288 m,高台组-灯影组顶,下?168.3 mm尾管固井封隔5180~7288 m井段,钻井过程中高台组、龙王庙组、沧浪铺组均发生过井漏,地层承压能力仅1.65 g/cm^3,套管重合段环空间隙仅12.69 mm,环空摩阻大,给?168.3 mm尾管固井带来了巨大挑战。通过优选3M空心玻璃微珠、高温增强材料DRB-2S等关键材料,形成1.57 g/cm^3低密度高强度韧性防窜水泥浆体系,优化浆柱结构与施工排量,使井筒薄弱点处(7016.3 m)最大动态当量密度不超过该处地层承压能力,实现近平衡压力条件下一次性上返固井。应用结果表明:五探1井?168.3 mm尾管固井质量好,试压合格,该方法能够提高超深易漏井段的尾管固井质量,有利于改善后期高压气井试油安全作业的井筒条件,为类似易漏失井固井提供了良好的经验借鉴。
Well Wutan 1 is an important wildcat well deployed in the new exploration area of Lower Paleozoic-Sinian in the eastern Sichuan Basin and its total depth is 8060 m.In the sixth section of this well,Ø190.5 mm bit is used for drilling from 6600 m to 7288 m andØ168.3 mm liner cementing is performed in Gaotai Formation-top of Dengying Formation to isolate the interval of 5180−7288 m.In the process of drilling,mud loss happens in Gaotai Formation,Longwangmiao Formation and Canglangpu Formation.The formation’s pressure bearing capacity is only 1.65 g/cm3,the annulus clearance in the overlapped casing section is only 12.69 mm,and friction in the annulus is high,which brings huge challenges to theØ168.3 mm liner cementing.The antichanneling toughness slurry system of low density(1.57 g/cm3)and high strength was prepared by optimizing the key materials,such as 3M hollow glass bead and high-temperature reinforcement material DRB-2S,and slurry column structure and construction displacement were optimized to ensure the maximum dynamic equivalent density at the weak point of the wellbore(7016.3 m)not higher than the formation’s pressure bearing capacity at that point,so as to realize the one-trip upward cementing under the near equilibrium pressure.The application results show that theØ168.3 mm liner cementing in Well Wutan 1 is of high quality with qualified pressure test result.It is indicated that this method can improve the quality of the liner cementing in the ultra deep thief sections and is beneficial to improve the wellbore conditions for the safe well test of high-pressure gas wells.The research results provide the valuable reference for the cementing of similar leakage wells.
作者
沈欣宇
胡锡辉
杨博仲
郭建华
李斌
谯青松
SHEN Xinyu;HU Xihui;YANG Bozhong;GUO Jianhua;LI Bin;QIAO Qingsong(Engineering Technology Research Institute,PetroChina Southwest Oil&Gasfield Company,Chengdu 610017,Sichuan,China;Drilling&Production Technology Research Institute,CNPC Chuanqing Drilling Engineering Company Limited,Guanghan 618300,Sichuan,China)
出处
《石油钻采工艺》
CAS
北大核心
2020年第1期35-39,共5页
Oil Drilling & Production Technology
基金
中国石油天然气股份有限公司重大科技专项“四川盆地高温高压含硫深井超深井钻井、完井及试油技术研究与应用”(编号:2016E-0608)
西南油气田公司重大科技专项课题“川东地区复杂构造盐下钻完井工艺技术研究”(编号:2016ZD01-04)。
关键词
四川盆地
川东地区
超深井
近平衡压力
固井
低密度
五探1井
Sichuan Basin
eastern Sichuan Basin
ultra deep well
near equilibrium pressure
cementing
low density
Well Wutan 1
