摘要
JY1HF井是部署在四川盆地川西南坳陷威远构造井研—犍为探区的第一口页岩气水平井,目的层为寒武系筇竹寺组,完钻井深4 623 m。该井钻进中面临深部海相地层可钻性差、研磨性强、水平段长度大、长裸眼油基钻井液环境固井质量差等难点。综合应用了高效钻头优选、涡轮钻井、PDC钻头配合耐油螺杆钻井、强封堵油基钻井液和优化套管柱结构—水泥浆体系等技术。结果表明,实钻水平段长1 203.72 m,海相古老难钻地层平均机械钻速相比邻井同尺寸井眼提高96%,页岩层平均机械钻速相比邻井同尺寸井眼提高6.1倍,实钻轨迹平滑,油层套管一次下入到位,固井质量全优。
JY1HF well is the first shale-gas horizontal well deployed at Jingyan-Qianwei block of Weiyuan structure, southwestern Sichuan Sag, Sichuan Basin. Its target interval is the Cambrian Qiongzhusi Formation and the drilling depth is 4623 m. There arelots of difficulties during drilling this deep marine strata, containing poor drillability, strong abrasiveness, long horizontal length, and low cementing quality under long openhole or by oil-based drilling fluid. So, some technologies were applied to this well, including highly efficient optimization of drilling bit, turbo drilling, PDC bit integrating with oil-resisting motor drilling, oil-based drilling fluid with strong sealing capability, and optimized casing string and slurry system. Better effects were obtained, for example, the drilled horizontal length of 1203.72 m, the average ROP in the marine strata increased by 96% compared to some adjoining wells with same hole size, the average ROP in this shale bed raised 6.1 times faster than those adjoining wells with same hole size, smooth well trajectory,casing running right the first time, and excellent cementing quality.
出处
《天然气技术与经济》
2016年第5期40-43,82-83,共4页
Natural Gas Technology and Economy
关键词
页岩气水平井
孕镶钻头
涡轮钻井
油基钻井液
JY1HF井
shale-gas horizontal well
impregnated bit
turbo drilling
oil-based drilling fluild
JY1HF well
