Abstract:  The exploitation of shale oil has become an important field in the development of unconventional oil and gas resources in the world. Horizontal well is one of the main technologies used in shale oil exploration and development. In order to solve the challenges like trajectory control, high pressure, collision prevention at close distance, backing pressure and lack of actualtarget zone drilling or testing data, a three-dimension formation model is established according to the principle of azimuthal gamma detection. Based on the log curve while drilling, a methodcalculating the dip angle of reference formationis proposed and the relevant formulae are also derived. The well trajectory is controlled by the combination of rotary steering drilling system and geosteering technology. The field application results show that the rotary steering drilling system can monitor the borehole annular pressure in real time and improve ROP, realizing automatic steering control and formation evaluation. By the formation dip angle of the reference layer, theinclination of " landing" point in the target layer and the distance between the bit and the boundary can be predicted ahead of time, the borehole trajectory will then be much smooth and the target be tapped more accurately. It can also optimizethe casing program and improvethe geosteering model, providing new reference and strategy for the later shale oil development.

摘要：  页岩油已成为全球非常规油气资源开发的重要领域，水平井是页岩油勘探与开发采用的主要技术之 一。为解决钻井过程中轨迹控制、高压、近距离防碰、托压以及目的层段无任何实钻和测试参考资料等问题，根据 方位伽马探测原理，建立了三地层数学模型，结合随钻测井曲线提出了“标志层地层倾角计算方法”并推导出相关 公式。采用了旋转导向钻井系统与地质导向技术相结合对井眼轨迹进行控制，现场应用结果表明，应用旋转导向 钻井系统可实时监测井底环空压力、提高机械钻速、实现自动导向控制和地层评价、通过标志层地层倾角提前预测 目的层“着陆”点井斜及钻头到边界的距离，使井眼轨迹光滑并精准中靶。优化了井身结构并完善了地质导向模 型，对后期页岩油开发提供了新的参考资料和策略。

关键词: 页岩油, 旋转导向, 水平井, 井眼轨迹控制, 油田开发