吉木萨尔致密砂岩油藏工厂化水平井钻井技术

A Factory-Like Drilling Technology of Horizontal Wells for Tight Sandstone Reservoirs in the Jimusaer Area

为提高吉木萨尔致密砂岩油藏开发速度,降低钻井成本,满足大规模开发的要求,进行了致密砂岩油藏工厂化水平井钻井技术研究。根据吉木萨尔凹陷的地质特点及工厂化水平井的钻井和完井要求,将其设计为三开井身结构,并根据工厂化水平井钻井的特点制定井眼轨迹控制技术措施。在重点防碰井段利用Landmark软件进行防碰扫描,防止两井相碰。选用旋转导向钻具和螺杆+水力振荡器钻进定向井段和水平井段,以提高定向井段和水平井段的钻速。工厂化水平井钻井技术在吉木萨尔区块不同平台钻了8口水平井,井眼轨迹控制良好,与设计吻合度高,成功实现了防碰绕障,2#平台2口水平井各绕障115m,3#平台1口井最大绕障265m;与2012年所钻的3口井相比,造斜段和水平段的平均机械钻速分别提高了240.0%和125.9%。这表明,致密砂岩油藏工厂化水平井钻井技术可有效防碰、降摩减阻和提高机械钻速,能满足吉木萨尔致密砂岩油藏大规模开发的要求。

In order to accelerate the development of tight sandstone reservoirs and reduce the drilling cost to meet the demand of large-scale development, the factory-like drilling technology of horizontal wells for tight sandstone reservoir was researched. According to the geological characteristics of the Jimsaer area and requirements of facrory-like drilling and completion for horizontal wells, the casing program was de- signed into three sections, and made the technical measures of controlling well trajectory based on the char- acteristics of cluster horizontal wells. Landmark software scanning was used to prevent two adjacent wells from colliding at key intervals, and the ROP of drilling directional and horizontal sections was improved by employing a rotary steering tool,the PDM and hydro-oscillator. The technique was applied in order to drill eight horizontal wells in tight sandstone reservoir on different platforms in Jimusaer area, and the well traj- ectories were well controlled. They basically met the need of planning, which successfully realized the anti- collision and detouring. Two horizontal wells in platform 2~＊ bypassed the barrier to 115 meters respective- ly,one well in platform 3~ even bypassed to 265 meters. Compared with the three horizontal wells that drilled in 2012,the average ROP was raised by 240 ~//00 in the vertical section and 125.9 ~ in horizontal sec- tion. The paper showed that the technology of factory-like drilling of horizontal wells for tight sandstone reservoir can effectively prevent well collision, reduce drag and friction, improve ROP significantly, and meet the demands of large-scale development of tight sandstone reservoir in the Jimusaer Area.