Abstract: Phase II Block of Fuling shale gas field is located in the periphery of the main block of Phase I, characterized with reservoir burial deepened, fault developed, and stratigraphic dip increased, and problems of well caving, deflection, lost circulation, and slow ROP prominent in Phase II drilling. Based on the analysis of the engineering challenges in the process of drilling,the compound drilling by PDC +?286mm high-torque motor and preventive measures for loss and collapse are planned to solve the loss-caving in Leikoupo Group at Jiangdong Block. For the high stratigraphic dip and difficult control of well inclination in straight hole section, a deflection-preventive and fast drilling technique for high steep structure is developed. For the poor drillability2ndspud drilling, anti-impact cone bitsare optimized to improve ROP by high torque PDM’ s plus hybrid bits. For the high friction and serious backing pressure in 3D horizontal borehole, the backing pressure relieving technology has been practiced, ROP is improved by more than 20% . For the circulation loss in the middle and deep formations, plugging technology has been developed. These have been test applied in 31 wells of PhaseII at Fuling shale gas field. The average drilling cycle has been shortened from 116. 18d to 80. 65d. The ROP acceleration effect is significant. It has good reference and guiding significance for the improvement of drilling speed in Phase II drilling at Fuling shale gas field.

Key words:  , Fuling shale gas field, Phase II, shale gas,horizontal well, drilling acceleration challenge, solution

摘要：  涪陵页岩气田二期工区位于一期主体区块外围，储层埋深增加、断层发育、地层倾角增加，在二期前 期钻井过程中，垮、斜、漏、慢等问题突出。文章在分析钻井过程中技术难点的基础上，针对江东区块雷口坡组地层 “塌漏同存”，制定了PDC＋Ø286 ｍｍ大扭矩螺杆复合钻井技术及雷口坡组堵漏、防垮技术措施；对于上部地层倾角 大，直井段井斜控制困难的问题，研究形成了高陡构造直井段防斜打快技术；针对二开可钻性差地层，优选了抗冲 击牙轮钻头，形成了大扭矩螺杆配合混合钻头提速技术；对于三维水平井摩阻大、托压严重的特点，实践了定向防 托压技术，提速效果在20％以上；为解决中深部的漏失，研究形成了防漏堵漏技术。该技术在涪陵二期31口井进 行试验应用，平均钻井周期由应用该技术前的 116.18ｄ缩短至80.65ｄ，提速效果显著，为工区二期钻井提速提效 具有较好的借鉴和指导意义。

关键词:  涪陵页岩气田;页岩气;水平井, 提速难点, 对策