中空螺杆马达井底动力绳索取心钻具的研制与试验

Development and test of hollow screw motor bottom hole power wire-line core drill

摘要:

针对大洋钻探硬岩取心钻具钻进效率低、取心效率低等问题，本文介绍了中国地质科学院勘探技术研究所研制的?185 mm规格中空螺杆马达井底动力绳索取心钻具的基本研制情况及陆地试验情况。研制过程中，通过理论计算和Ansys Workbench有限元仿真模拟，对中空式螺杆马达螺旋线型的结构进行了优化设计及动力学分析，并对万向节进行了受力安全分析，优选了材质，钻具攻克了多头小偏移量短节距中空转子和柔性中空万向节等关键技术，通过在陆地开展花岗岩块取心试验，验证了该取心钻具原理样机工作性能的可行性，为该钻具的工程应用提供了工作参数指导及匹配钻头的优选，也可为我国大洋钻探及深地科学钻探提供硬岩取心技术支持。

Abstract:

Aiming at the problems of low drilling efficiency and low coring efficiency of hard rock coring tools in ocean drilling， this paper introduces the basic development and land test of ?185mm hollow screw motor bottom hole power rope coring tool developed by the Institute of Exploration Techniques， CAGS. In the development process， through theoretical calculation and Ansys Workbench finite element simulation， the spiral structure of the hollow screw motor is optimized and the dynamic analysis is carried out. The force safety analysis of the universal joint is carried out， and the material is optimized. The key technologies such as multi-head small offset short pitch hollow rotor and flexible hollow universal joint are overcome. The feasibility of the working performance of the prototype of the coring tool is verified by the coring test of granite block on land， which provides the guidance of working parameters and the optimization of matching drill bit for the engineering application of this coring tool. It can provide hard rock coring technical support for ocean drilling and deep scientific drilling in China.