盐井大井斜开窗侧钻水平井绕腔连通技术

盐井水溶开采形成溶腔后，溶腔中的岩盐层，因作用于岩盐层上的支承压力超过其所处应力状态的强度极限而发生塑性破坏，随着开采的继续，破坏形式不变，破坏范围增大。原苏16井组钻井轨迹下穿泥岩造成溶腔通道堵塞，采卤量只有6~7 m3/h，基本处于半停产状态，严重影响了卤水的产量，采用多种工艺均未能解堵。通过引进大斜度开窗工艺、短半径水平井技术，对侧苏盐16-1井进行三维绕障设计，轨道优化，并优化开窗侧钻技术方案，实现侧苏盐16-1井轨迹绕过小腔与苏盐16井大溶腔连通的目。该井在大斜度开窗工艺、高造斜率轨迹控制以及绕腔连通技术方面取得成功，形成大斜度开窗绕腔连通技术，为今后盐井水平连通井开窗侧钻的常态化提供借鉴。

Cavity bypassing connection technology for high-angle window sidetracking of brine horizontal well

After a cavity is built up by means of solution mining through brine wells, the rock salt bed in the cavity suffers plastic damage for its support pressure is higher than the strength limit corresponding to its stress state. As the exploitation continues, the damage form is unchanged but the damage range is expanded. When running through mudstones along the original drilling trajectory of well group Su 16, cavity passages are blocked, so brine exploitation rate is impacted seriously, only 6-7 m3/h, it is basically at semi production state and the blockage cannot be removed even multiple technologies are adopted. High angle windowing technology and short radius horizontal well technology were introduced to carry out 3D bypass design, trajectory optimization and window sidetracking program optimization on side Well Suyan 16-1 so that its trajectory can bypass small cavities and connect with large cavities of Well Suyan 16. With the successful application of high angle windowing technology, high defection rate trajectory control and cavity bypassing connection technology, the high angle windowing based cavity bypassing connection technology is developed. It provides the demonstration basis for the normalization of window sidetracking of horizontally connected brine wells.