四川盆地致密气水平井钻井关键技术  

Key drilling technologies for tight gas horizontal wells in Sichuan Basin

作　　者：刘明 许鹏 陈述 夏林 边建杰 张华[2] LIU Ming;XU Peng;CHEN Shu;XIA Lin;BIAN Jianjie;ZHANG Hua(Engineering Technology Research Institute,CNPC Bohai Drilling Engineering Co.,Ltd.,Tianjin 300280,China;Oil and Gas Cooperative Development Branch,CNPC Bohai Drilling Engineering Co.,Ltd.,Tianjin 300280,China;Pipe and Well Control Technology Service Branch,CNPC Bohai Drilling Engineering Co.,Ltd.,Tianjin 300280,China)

机构地区：[1]中国石油集团渤海钻探工程有限公司工程技术研究院,天津300280 [2]中国石油集团渤海钻探工程有限公司油气合作开发分公司,天津300280 [3]中国石油集团渤海钻探工程有限公司管具与井控技术服务分公司,天津300280

出　　处：《非常规油气》2024年第4期152-159,共8页Unconventional Oil & Gas

基　　金：中国石油渤海钻探工程有限公司科技项目“西南油气田致密气项目优快钻完井技术研究”(2022D34Y-02)。

摘　　要：为搞清四川盆地致密水平井钻井工程技术难点,针对致密气水平井井眼轨迹设计复杂、地层易坍塌掉块、卡钻风险高、下套管困难以及钻井周期慢等技术难点,开展了地层压力预测及应力分析、井眼轨迹设计优化、钻井参数及钻井设备优选、优化钻井液体系及参数、下套管模拟预测和套管强度校核等多方面工作。研究结果表明:1)西南致密气水平井地层坍塌压力为1.55~1.60 g/cm^(3),当水平段钻井方位约为105°及15°时井壁稳定性较好,有益后期储层压裂改造;2)采用“双二维”轨迹设计,钻具组合扭矩降低15%以上,摩阻降低20%以上,定向钻井速度可提高45%以上;3)钻机配套DQ50DBS型顶部驱动装置,配置2~3台1600HP钻井泵和NC52非标钻杆,钻井排量控制在35 l/s以上,可保证井眼清洁度及携岩效率;4)使用白油基钻井液体系的同时加入“刚性粒子+树脂纤维+沥青胶粒”措施进行封堵,可保证井壁稳定;5)优选P110钢级、10.54 mm壁厚完井套管并采用旋转方式下入,在满足后期压裂施工的同时,降低套管下入摩阻12%以上。上述成果认识对加快四川盆地致密气勘探开发进程具有指导意义。In order to clarify the technical difficulties of tight horizontal well drilling engineering in Sichuan Basin,the author carried out various aspects of work such as such as formation pressure prediction and stress analysis,well trajectory design optimization,drilling parameters and equipment optimization,optimization of drilling fluid system and parameters,casing running simulation prediction and casing strength verification.The results indicate that:1)The formation collapse pressure of the southwest tight gas horizontal well is 1.55~1.60 g/cm^(3).When the drilling direction of the horizontal section is about 105°and 15°,the wellbore stability is good and beneficial for reservoir fracturing.2)Adopting“two-dimensional”trajectory design,the torque of the drilling tool assembly is reduced by more than 15%,the friction is reduced by more than 20%,and the ROP can be increased by more than 45%in directional section;3)The drilling rig is equipped with a DQ50DBS top drive device,equipped with 2 to 31600HP drilling pumps and NC52 non-standard DP.The drilling flow rate is controlled over 35l/s,which can ensure wellbore cleanliness and debris carrying efficiency;4)The use of a white oil based drilling fluid system and the addition of“rigid particles+resin fibers+asphalt particles”for sealing to ensure the stability of the wellbore;5)Select P110 steel grade,10.54 mm wall thickness completion casing,and adopting the rotating method to reduce the running casing friction by more than 12%while meeting the requirements of fracturing construction.The above achievements have guiding significance for accelerating the exploration and development process of tight gas in the Sichuan Basin.

关 键 词：致密气 水平井 勘探开发一体化 钻井关键技术 

分 类 号：TE242[石油与天然气工程—油气井工程]