基于膨胀管技术的小井眼水平井钻井技术应用

Application of the Slim Hole Horizontal Well Drilling Technology Based on the Expansion Tube

摘要:

塔河油田地质情况复杂，岩性差异大，地层压力变化大，局部区域有高压盐水层和膏盐层，开孔尺寸受限，给钻井工程带来诸多技术难题。针对这些难题，提出了坐封斜向器开窗侧钻、定向随钻扩眼、膨胀管和小井眼水平井钻井技术。TK7-640CH井的钻井实践表明，以上技术在塔河油田奥陶系φ177.8 mm套管开窗侧钻水平井的应用具有可行性，能够封隔复杂地层和异常压力系统。就侧钻井技术难点和技术方案的可行性进行了探讨和分析，总结该井实钻所取得的成功经验，为塔河油田老井的恢复及再生提供了技术支撑。

Abstract:

The geological conditions are complex with large lithology difference and stratum pressure difference in Tahe oilfield, there are local high pressure brine zone and gypsum salt bed, the hole size is restricted, which bring many technical difficulties for drilling engineering. Aiming at these problems, sidetracking by setting whipstock, directional ream while drilling, expansion tube and slim-hole horizontal well drilling technology were put forward. TK7-640CH drilling practice shows that the above technologies are feasible in the application for φ177.8mm casing whipstock sidetracking horizontal well in ordovician of Tahe oilfield, can seal complex formation and the abnormal pressure system. The paper discusses and analyzes the feasibility of the technical difficulties and technical schemes in sidetrack drilling; sums up the successful experience in real drilling, which provides technical support for the recovery and regeneration for old wells in Tahe oilfield.