摘要
针对四川盆地页岩气井储层埋藏深,部分地层缝洞发育,井漏层段多,断层及破碎带易卡钻,地层压实程度及温度高,可钻性差、井下工具频繁失效等,近年来通过多途径的攻克,探索出系列特色钻井技术:结合油基钻井液与页岩作用机理,研发了多元多级微纳米封堵剂、乳化剂等,形成了油基钻井液的强封堵技术,以应对钻井过程中的井漏、井壁失稳及卡钻等复杂;围绕地层可钻性、研磨性,设计出个性化钻头,实现难钻地层的高效破岩;引入振荡螺杆、加强型扭力冲击器等配套提速工具,形成井下振动分级控制技术,改善井下工具稳定性;自主研发的降温装置,匹配耐高温旋导工具,降低了井下工具故障率;借鉴“三高”井成熟的控压降密度技术,实行精准控压降密度,释放提速新动力。该系列技术有力地支撑了四川深层页岩气的勘探开发,满足深层页岩气可持续勘探开发的需要。
According to the problems of deep buried reservoirs in Sichuan Basin,developed fractures and caves,lost-circulation intervals,pipe stuck in faults and fracture zones,highly compacted formation and high temperature,poor drillabiility,frequent failure of downhole tools and etc.,a series of unique drilling technologies have been explored through multiple approaches in recent years.Combining the interaction mechanism of oil-based drilling fluid and shale,multi-stage micro-nano sealing agents and emulsifiers have been developed,the strong plugging technology of oil-based drilling fluid has been formed to cope with the complications of loss,wellbore wall instability and sticking in the drilling process;focusing on the drillability and abrasiveness of the formation,the customized bit was designed to achieve efficient rock breaking in the difficult-to-drill formation;by introducing oscillating screw and enhanced torque impactor,the vibration classification control technology has been formed to improve the stability of downhole tools;the self-developed cooling device is applied to high temperature resistant rotary guide tools,reducing the failure rate of downhole tool;with reference to the mature technology of pressure control and density reduction in the"Three high"well,precise pressure control and density reduction have been implemented to release power for speed increase.These series of technologies have strongly supported the exploration and development of deep shale gas in Sichuan Province and met the needs of sustainable exploration and development of deep shale gas.
作者
杨瑞帆
YANG Ruifan(Drilling&Production Engineering Technology Research Institute,CNPC Chuanqing Engineering Co.,Ltd.,Guanghan,Sichuan 618300,China)
出处
《钻采工艺》
CAS
北大核心
2023年第4期13-19,共7页
Drilling & Production Technology
基金
中国石油天然气集团科学研究与技术开发项目“水平井优质高效钻完井技术研究”之课题“水平段长2500米以上的致密/页岩气水平井‘一趟钻’技术研究”(编号:2021DJ4204)。
关键词
四川盆地
深层页岩气
特色钻井技术
堵漏技术
个性化钻头
提速工具
控压技术
Sichuan Basin
deep shale gas
characteristic drilling technology
plugging technology
customized drill bit
downhole tools for ROP optimization
pressure control technique
作者简介
杨瑞帆(1985-),硕士,工程师,现主要从事定向井及水平井关键技术研究与应用工作。地址:(618300)四川省广汉市中山大道南二段88号,电话:13668304543,E-mail:yangrf_ccde@cnpc.com.cn
