大庆油田超短半径水平井钻井技术

针对超短半径水平井钻井存在的造斜段井眼曲率大于10°/m、常规钻具无法顺利通过大曲率造斜段、筛管完井困难等技术难题,大庆油田成功研制了旋转自封器、139.7mm导向锚定系统、多功能导向管、高强度柔性钻杆、特制117.5mm三牙轮钻头等工具,形成了一套较为完善的超短半径水平井钻井技术。该技术采用纯机械造斜原理,不需弯螺杆等动力钻具即可完成3.2m曲率半径的造斜段施工,造斜能力达到(15°～20°)/m;高强度柔性钻杆的应用确保了井下钻具组合顺利通过大曲率造斜段及水平段的稳斜钻进;并实现117.5mm井眼防砂筛管完井,满足后续修井作业要求。自2009年以来,大庆油田已完成16口超短半径水平井施工,平均钻井周期12.14d,平均井眼曲率15.21°/m,中靶率100%。介绍了大庆油田超短半径水平井钻井技术的关键技术研究与现场应用情况。

Ultra-Short Radius Horizontal Well Drilling Technology in Daqing Oilfield

The ultra-short radius horizontal well technology can effectively develop thin,vertical fracture,heavy crude and low permeability reservoirs.The technical principles of this technology and the specially designed drilling tools for Daqing Oilfield were introduced.The fast milling in 139.7 mm casing,the short radius build-up/holding and the whole well reverse circulation in 117.5 mm borehole were introduced.The advantages of this technology were analyzed.Using Well Xing-Ping G2 as an example,the field application of this technology was introduced in detail.The results show that the liner completion operation in this well was achieved successfully which lays a foundation for continuous production and the necessary workovers.Since 2009,this technology has been used in 16 ultra-short radius horizontal wells in Daqing Oilfield with the maximum curvature of 16.93°/m and targeting rate of 100%.