绕盐岩溶腔水平对接井井眼轨迹设计方法研究

Research on Design Method of Hole Trajectory of Horizontally Butted Well of Salt Cavern-Avoiding

双江盐岩矿矿区位于山区,地面不平整,布置井场困难,为降低成本,利用现有的一对水平对接井井场新布置一对空间绕障水平对接井。本文采用圆锥形溶腔模型计算了现有水平对接井的溶腔范围,最大溶腔半径197.8m。对比分析了小井斜长稳斜段方案与较大井斜短定向段方案,认为较大井斜短定向段方案更优。使用COMPASS软件设计了绕盐岩溶腔水平对接井的井眼轨迹,并进行了防碰扫描分析。防碰扫描结果井眼间最近距离为352.11m,最不利条件下井眼距溶腔87.11m,新井眼与溶腔间距满足安全要求,可以施工。本文为类似条件下的工程设计提供了有益的参考。

Shuangjiang rock salt mine was located in the mountainous area,the ground was not smooth,so it was difficult to arrange the well site.In order to reduce the cost,a new pair of horizontal butt Wells which avoiding obstacle were arranged by using the existing pair of horizontal butt well site.In this paper,the conical cavity model was used to calculate the cavity range of existing horizontal butt Wells,and the maximum cavity radius is 197.8m.The plan of long steady slope section with small well deviation was compared with the short directional section with large inclination,and it was considered that the short directional section with large inclination was better.COMPASS software was used to design the trajectory of the horizontal butt well of salt cavern-avoiding,and anti-collision scan analysis was performed.Under the most unfavorable conditions anti-collision scanning results show that the closest distance between boreholes was 352.11m,and the distance between borehole and cavity was 87.11m.The distance between new borehole and cavity meets the safety requirements and can be constructed.This paper provides a useful reference for engineering design under similar conditions.