摘要
为了加快实现深层页岩气田效益开发,以四川盆地南部WR气田下志留统龙马溪组深层页岩气为研究对象,分析了影响钻井提速提效的难点,通过优化井身结构、强化钻井参数、集成提速工艺、创新高性能水基钻井液、优化轨迹控制等专题研究,形成了一套适合该气田钻井提速提效的技术方案。研究成果在深层页岩气应用了146口井,完钻了122口井,平均机械钻速为8.95 m/h,平均钻完井周期为93.60 d,优质储层钻遇率达98.40%。研究结果表明:①∅215.9 mm钻头完钻的三开制井身结构能够满足优快钻井的需要;②垂直钻井技术和预弯曲动力学防斜打快技术能够实现上部井段钻井提速,保障平台防碰安全;③强化钻井参数(大排量、高钻压、高转速)是提高钻井提速、提高清砂效果的有效手段;④防喷导流钻井技术有利于解决中二叠统茅口组-下志留统石牛栏组喷漏同存技术难题;⑤复合钻井液是减少油基钻井液用量、减少油基岩屑产生量、降低环保压力的有效途径;⑥“旋转导向+方位伽马”能够减少轨迹调整,与“MWD+近钻头方位伽马+耐油螺杆”配合,能够实现长水平井提速提效和优质储层钻遇率。结论认为,所形成的深层页岩气钻井提速提效技术可以解决WR气田钻井技术难题,可以为国内外深层页岩气开发提供借鉴和参考。
In order to achieve a benefit development of deep shale gas fields,some difficulties in improving the rate of penetration(ROP)and drilling efficiency were analyzed by taking deep shale gas in Longmaxi Formation of WR gasfield as an objective.And a set of technological scheme suitable for this improvement was established by virtue of casing program optimization,drilling parameter enhancement,ROP technology integration,high-perfor⁃mance water-based drilling fluid innovation,and trajectory control optimization.This technologies scheme was ap⁃plied to 146 deep shale gas wells,among which 122 ones were completed with the average ROP of 8.95 m/h,the average drilling and completion cycle of 93.60 d,and the drilling rate in high-quality reservoir of 98.40%,respectively.Results show that(1)the three-spud casing program withΦ215.9 mm bit can meet the need of op⁃timized fast drilling;(2)vertical drilling technology and anti-deviation and fast drilling technology based on prebending dynamics can improve the ROP in the upper hole section and ensure the platform anti-collision safety;(3)to enhance drilling parameters,such as large displacement,high weight of bit,and high rotation speed,is ef⁃fective for improving both ROP and desanding effect;(4)blowout prevention and diversion drilling is beneficial to solving the technological difficulty of co-existence of blowout and leakage from the Middle Permian Maokou Formation to the Lower Silurian Shiniulan Formation;(5)compound drilling fluid is effective to reduce the con⁃sumption of oil-based drilling fluid,the yield of oil-based cuttings,and the environmental pressure;and(6)"ro⁃tary steering+azimuth gamma"can reduce trajectory adjustment.And combined with"MWD+near-bit azimuth gamma+oil-resisting screw",it can improve the ROP and drilling efficiency in long vertical wells or the drill⁃ing rate in quality reservoirs.In conclusion,the proposed technology for improving the ROP and drilling efficien⁃cy in deep shale gas wells can solve the drilling difficulties in WR g
作者
刘伟
朱礼平
潘登雷
周楚坤
梁霄
刘小斌
LIU Wei;ZHU Liping;PAN Denglei;ZHOU Chukun;LIANG Xiao;LIU Xiaobin(Engineering Technology Management Department,Sinopec Southwest Oil&Gas Company,Chengdu,Sichuan 610041,China;Downhole Operation Company,Sinopec Southwest Petroleum Engineering Co.,Ltd.,Deyang,Sichuan 618000,China;PetroChina Southwest Oil&Gasfield Company,Chengdu,Sichuan 610051,China)
出处
《天然气技术与经济》
2022年第3期44-50,共7页
Natural Gas Technology and Economy
基金
中国石化科技攻关项目“威远-永川深层页岩气开发关键技术”(编号:P18058)。
关键词
页岩气
水平井
钻井提速
轨迹控制
Shale gas
Horizontal well
ROP improvement
Trajectory control
