短位移、浅垂深“反勾”型水平井钻完井技术

欢127-平2井为辽河油田第1口二开套管射孔完井的水平井,油藏埋深较浅。由于地面条件限制,水平段入靶位移192.61 m,为历年来辽河油田水平井中最短入靶位移。为满足油藏地质开发需要,钻井施工中采取了"反勾"型钻进,通过反向位移42 m,顺利地完成了水平段油藏的钻进及开发;施工过程中,井眼安全、套管下入顺利。"反勾"段钻井技术较复杂,施工难度大、井眼轨迹控制精度高、再加上地层较复杂,给轨迹控制带来了困难。介绍了该井工程设计、地质设计、主要技术难点、施工概况、井眼轨迹测量及控制技术等。实践证明,对于短位移、浅垂深的水平井钻进开发,实施这种"反勾"型方案是切实可行的。

Drilling and Completion Technique of Short Displacement, Shallow Vertical Depth Horizontal Well with Reversed -Tick Type Well Trajectory

The Well Huan127-Ping2 is the first horizontal well with technical casing perforation completion, with shallow reservoir. As to the surface condition limits, the horizontal section entered the target 192.61 m, which is the shortest displacement entering the target over the years for Liaohe Oilfield horizontal wells. To satisfy the needs of reservoir geology development, drilling operation adopts the reverse type technique. The horizontal reservoir section drilling and development is completed successfully through the over than 40 m back displacement. During the operation, the well hole is safe and the setting of casing was carried out smoothly. It is the first horizontal well in Liaohe Oilfield that puts the reversed-tick type well trajectory drilling technique into practice. The well track control is very difficult because the drilling technique in reversed track section is complicated, the operation difficulty is high, the well track control accuracy is high and the geologic strata are also complex. The engineering design, geology design, main technique difficulty, operation general situation, well track measurement and control technique of the well are introduced. Practice testifies that practice of this kind of reverse well track type project is feasible for the drilling and development of short displacement, the shallow vertical depth horizontal well.