风积沙沉陷区油气管道安全距离控制方法研究

Research on control and prediction method of safety distance of oil⁃gas pipelines in aeolian sand mining subsidence area

为优化开采沉陷区内油气管道安全距离的布置,以鄂尔多斯盆地气煤重叠区内风积沙沉陷区为工程背景,以概率积分法为研究基础,提出了地表下沉曲线高斯函数;结合沉陷区内管道的运动轨迹、极限变形量与地表下沉曲线相关关系,建立了沉陷区内油气管道安全距离控制预测方法,并采用数值模拟方法和工程实例进行对比验证。结果表明:沉陷区管道运动轨迹是沿着地表下沉曲线以直线方式指向采空区中心,其变形呈现偏向采空区的漏斗状;沉陷区内油气管道安全距离控制预测方法在兼顾油气管道和开采安全的前提下,缩短了采煤工作面与油气管道间的距离留设,为气煤重叠区内管道的布置方式提供了新方法;合理调节油气⁃煤炭资源共采机制下的协调开采,为煤系共伴生资源的协同开发提供了新思路。

In order to optimize the safe distance arrangement of oil⁃gas pipeline in the coal mining sub⁃sidence area,taking the gas⁃coal overlap area in the Ordos Basin as the engineering background,the sur⁃face subsidence curve Gaussian function is proposed based on the probability integration method.This function combines the movement trajectory with limit of the pipeline in the subsidence area.By establis⁃hing the relationship between deformation levels and the surface subsidence curve,a predictive method for controlling the safe distance of oil and gas pipelines in subsidence areas is developed,the method that is compared and validated through numerical analysis and engineering applications.The results show that the pipeline movement trajectory in the subsidence area is directed to the center of the goaf in a straight line along the surface subsidence curve,showing bending settlement deformation;the predictive method for safe distance control of oil and gas pipelines in subsidence areas is devised,taking into account both the pipeline and coal mining activities.Under the premise of safe activity,this approach aims to mini⁃mize the distance between working face and the oil⁃gas pipeline;providing a new method for the pipeline layout in the overlapped area of gas⁃coal.It also yields insights into the coordinated extraction of gas⁃coal resources,addressing challenges related to the development of coal⁃measure resources under a co⁃extraction mechanism.