超深井高钢级厚壁套管开窗研究及应用

Research and Application of Window Opening for High-grade Steel Thick-wall Casing in Ultra-deep Wells

汤明 王双宁 何世明 张光福 刘晓森

TANGMing WANGShuangning HEShiming ZHANGGuangfu LIUXiaosen

油气藏地质及开发工程全国重点实验室·西南石油大学, 四川 成都 610500 中国石油西南油气田公司勘探事业部, 四川 成都 641400 陇东学院能源工程学院, 甘肃 庆阳 745000

State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China Exploration Division, Southwest Oil & Gas Field Company, PetroChina, Chengdu, Sichuan, 641400, China School of Energy Engineering, Longdong University, Qingyang, Gansu, 745000, China

开窗侧钻是处理井下复杂事故的重要方法之一，在超过7 000 m的超深井高钢级（TP155V）厚壁（15.83 mm）套管开窗侧钻，不仅面临高温高压的井下复杂环境，还具有作业时间长费用高的难点。为提高超深井高钢级厚壁套管开窗的成功率和作业效率，采用ABAQUS软件建立套管开窗侧钻仿真模型，优选开窗铣锥，采用地面试验对仿真结果进一步论证，将优选出的适用于超深井高钢级厚壁套管开窗铣锥进行现场应用。仿真模拟表明，铣锥肩部和锥顶外圆是开窗和修窗的主要工作面，圆锥型铣锥开窗应力最大、开窗效率最高、窗口形状规整平滑、优先推荐；地面试验中圆锥型铣锥能够成功开窗，螺旋型和钻头型铣锥均未开窗成功；双探102井在井深7 473 m处、壁厚15.83 mm和钢级TP155V的套管采用圆锥型铣锥成功开窗侧钻，创国内套管开窗侧钻井深最深、钢级最高和壁厚最厚等3项纪录。该研究成果对于超深井高效开窗侧钻提供了借鉴，为超深油气资源高效勘探开发提供支撑。

Windowing and sidetracking is one of the important methods to deal with complex accidents underground. Windowing and sidetracking in ultra-deep wells such as not less than 7 000 m well depth with high steel grade (TP155V) and thick wall (15.83 mm) casing not only faces complex underground environment with high temperature and pressure, but also has the difficulty of long operation time and high cost. In order to improve the success rate and operation efficiency of high steel grade thick wall casing windowing in ultra-deep wells, this paper uses ABAQUS software to establish the casing windowing side-drilling simulation model and optimize the windowing milling cone. Ground tests are used to further demonstrate the simulation results, and the selected ones are suitable for the windowing milling cone in ultra-deep wells for field application. The simulation shows that the milling shoulder and the outer circle of the cone top are the main working faces of window opening and window repairing. The conical milling cone has the largest window opening stress, the highest window opening efficiency, and the regular and smooth shape of the window. In the ground test, the conical milling cone can successfully open the window, but the spiral milling cone and the drill type can't open the window successfully. The casing with a depth of 7 473 m, a wall thickness of 15.83 mm and steel grade TP155V was successfully drilled by conical milling cone in Well Shuangtan102, which set three records in China for the deepest drilling depth, the highest steel grade and the thickest wall thickness. The research results of this paper provide a reference for the efficient windowing and sidetracking of ultra-deep Wells, and provide support for the efficient exploration and development of ultra-deep oil and gas resources.

10.11885/j.issn.1674-5086.2023.12.27.35