彭页HF-1页岩气水平井钻井关键技术

Key Technologies Adopted for Shale Gas Horizontal Well Pengye HF-1

水平井是开发页岩气的有效方式,但页岩气水平井施工中存在井眼轨迹难以控制、摩阻扭矩大、机械钻速偏低、井壁稳定性差、固井质量难以保证等难题。在彭页HF-1井施工过程中,综合应用了旋转导向钻井技术、油基钻井液和双凝双密度水泥浆等,并进行了钻具组合和钻头的优选,钻井周期比设计周期缩短13d。对该井的轨迹控制情况、井身质量、摩阻扭矩、固井质量等进行了分析,全井平均机械钻速达到6.28m/h,狗腿度保持在6°/30m以下,摩阻保持在150～250kN,施工效果良好。该井实钻效果表明,旋转导向钻井技术和油基钻井液是页岩气水平井施工成功的关键,对国内其他页岩气水平井施工具有指导和借鉴作用。

Horizontal well is the most effective means for shale gas production, but problems such as difficult well trajectory control,great friction drag and torque, low ROP, poor well bore stability and poor cementing quality exist in shale gas horizontal well. During the drilling of Pengye HF-1 Well, some advanced technologies such as rotary steering system,OBM, special cementing had been used,BHA and drilling bit had been optimized,as a result,the drilling cycle had been reduced by 13 days. This paper analyzed the well trajectory control, well bore quality, friction drag, and cementing quality of this well. According to the analysis,the average ROP was 6.28 m/h, the dogleg was below 6°/30 m, small friction drag was kept between 150-250 kN, demonstrating good drilling results. The technical application showed that rotary steering system and OBM were the keys for successful operation of shale gas horizontal wells. Both of the technologies play an exemplary and referential role in the operation of other domestic shale gas horizontal wells.