长庆致密油三维水平井钻井技术研究与应用

长庆油田致密油资源丰富，是上产稳产5 000×104t 战略目标的重要资源基础。由于开发区主要分布在梁峁交 错的黄土塬区，受地貌条件与开发要求的限制，需要开展带有较大偏移距的三维水平井钻井。三维水平井轨迹控制困 难、泥岩坍塌、摩阻扭矩突增等瓶颈难题严重制约了水平井的规模推广。为解决大偏移距三维水平井施工难题，形成 高效开发致密油藏的主体钻井技术，开展了三维井井身剖面优化、轨迹控制攻关、钻井液体系研究，形成了致密油藏 三维水平井钻井技术。并在YAP 5H 井进行了先导性试验，钻井过程中未出现泥岩坍塌、摩阻扭矩正常、井眼轨迹平 滑，完钻水平段长1 535 m，试油产量119.7 m3/d。该井的顺利实施，首次实现了致密油水平井由二维向大偏移距三维 钻井的技术创新与突破，为长庆油田水平井开发方式的转变和实现致密油经济有效开发打下基础。

Research and Application of the 3D Horizontal Well Drilling Technology in#br# Changqing Tight Oilfield

The ChangQing Oilfield has resourceful tight oil，and it is an important expiration area for the 50 million tons of oil. Because the development zone is mainly distributed in geomorphic conditions of staggered hill and loess tableland，to carry out 3D horizontal well drilling with larger offset is necessary. Difficulties in trajectory control，unstable mud shale and increase torque and drag in drilling，restrict the extend of horizontal technology. In order to resolve the difficulties in 3D horizontal well drilling technology，and form an effective drilling technology in tight oil exploration，researches are conducted on 3D horizontal well profile optimization，well bore trajectory control and drilling fluid to form 3D horizontal well drilling technology in tight oil. First testing is done on YAP 5H horizontal well in CNPC in July. There is no collapse in the layers，the drilling torque and drag is normal and the wellbore trajectory is smooth，achieving 1 535 m long horizontal section wells and 119.7 m3/d tested oil yield. It is the first time for the technology innovation and breakthrough from 2D to 3D horizontal well in the tight oil to make a transformation for the horizontal well development mode and lay a foundation for the effective and economic development of tight oil in Changqing Oilfield.