浅层钻探技术在山区输电线路勘察中的应用研究

Application of shallow drilling technology in the transmission lines survey at mountainous areas

摘要:

山区输电线路塔位区大多山高坡陡、植被发育、水源匮乏，导致钻探设备搬迁困难、用水不便，严重影响地质钻探工作开展。本文聚焦山区输电线路地质勘察工作需求，开展基于浅层钻探技术的系统性、集成性研究，引入了小口径（?46 mm）绳索取心技术，研制了新型高效的PDC钻头，优化了钻机提钻装置、循环系统、钻井液配方等，并在试验中得到验证。结果表明，无水钻进工艺适用于山区输电线路地质勘察，浅钻绳索取心技术可有效解决孔壁坍塌、钻进效率低等问题，升级后的钻机循环系统可进行钻井液循环钻进，通过优化钻井液配方可将取心率提高到85%以上，解决了山区输电线路地质钻探工作效率低、取心率低等问题。

Abstract:

Most of the transmission line tower position in mountainous areas have high mountains，steep slopes，developed vegetation and lack of water，leading to the relocation of drilling equipment difficult， inconvenient water，which seriously affect the work of geological drilling.This paper focuses on the needs of geological survey of transmission lines in mountainous areas，carries out systematic and integrated research based on shallow drilling technology， introduces small diameter （?46 mm） wire line coring technology，develops new efficient polycrystalline diamond composite drill bit， optimizes drilling lifting device， circulation system，drilling fluid formula，etc.，and has been verified in the test.The results show that the waterless drilling technology is suitable for the geological survey of transmission lines in mountainous areas. The shallow drilling wire line coring technology can effectively solve the problems of hole wall collapse and low drilling efficiency. The upgraded drilling rig circulation system can carry out drilling fluid circulation drilling. By optimizing the drilling fluid formula，the coring rate can be increased to more than 85%.Solving the problems of low efficiency and low heart rate in geological drilling of power transmission lines in mountainous areas.