地质特深孔绳索取心钻杆机械性能研究

Research on mechanical properties of wireline drill pipes for geological ultra-deep holes

摘要:

地质特深孔绳索取心钻杆结构区别于API石油钻杆，其机械性能计算不可直接引用API石油钻杆的相关理论公式。针对这一理论依据与计算方法缺失，本文对地质特深孔双台肩钻杆接头进行了受力分析，开展了钻杆接头拉伸载荷与扭转载荷计算理论研究，构建了绳索取心钻杆机械性能计算的理论方法。同时，通过有限元分析和台架试验，确定了H-5000规格双台肩绳索取心钻杆的机械性能，验证了计算方法的准确性，并提出了钻杆结构改进建议与下一步研究方向，为高性能薄壁绳索取心钻杆“服役”于5000 m地质岩心钻探工程提供了技术支撑。

Abstract:

wireline coring drill pipe for geological ultra-deep hole is structurally different from the API oil drill pipe; thus their mechanical properties cannot be determined by the relevant formulas of API oil drill pipe directly. In view of the lack of theoretical basis and calculation method, this paper analyzes the stress of the double shoulder drill pipe joint for geological ultra-deep hole, carries out the theoretical research on the calculation of tensile load and torsional load for the tool joint, and develops the theoretical calculation model of the wireline coring drill pipe’s mechanical properties. Through the finite element analysis and property test, the mechanical properties of the H-5000 drill pipe are determined, and the accuracy of the calculation method is verified. The proposals for improving the drill pipe structure and the next research direction are put forward, which provide technical support for deployment of the high-performance thin-wall wireline coring drill pipe in the 5000m geological core drilling works.