绳索取心钻头在钾盐勘探的应用及优化技术——以JG-2井为例  

Application and Optimization technology of rope core drilling bit in potassium salt exploration:Taking JG-2 well as an example

作　　者：易强忠 吴永鹏 杨建伟 王荣槐 王长如 黄伟艇 喻忠伟 王久全 YI Qiangzhong;WU Yongpeng;YANG Jianwei;WANG Ronghuai;WANG Changru;HUANG Weiting;YU Zhongwei;WANG Jiuquan(The Second Survey Institute of Geological Engineering Co.,Ltd.,Kunming 650200,Yunnan,China;Kunming Natural Resources Survey Center of China Geological Survey,Kunming 650100,Yunnan,China;Jinshi Drilling(Tangshan)Co.,Ltd.,Tangshan 063000,Hebei,China)

机构地区：[1]云南地质工程第二勘察院有限公司,云南昆明650200 [2]中国地质调查局昆明自然资源调查中心,云南昆明650100 [3]金石钻探(唐山)股份有限公司,河北唐山063000

出　　处：《矿产勘查》2024年第S01期376-383,共8页Mineral Exploration

基　　金：中国地质调查局地质调查项目“重点含盐盆地锂钾资源调查评价”(DD20221913)资助。

摘　　要：JG-2井是中国地质科学院矿产资源研究所为进一步查明思茅盆地勐野井组钾盐资源而布置于景谷凹陷盆地的地质调查井,设计井深1800 m。全孔取心分别采用金刚石和PDC绳索取心工艺技术,施工中出现岩盐、泥岩、砂岩及泥砾岩互层频繁、反复交替,致使岩石可钻性及研磨性变化快,钻头机械钻速快-慢不均、泥包及岩心磨损严重等问题,对钻头选型带来较大的困难、影响了钻进效率。本文针对上述问题,分析总结了钻遇地层岩性特征和使用钻头类型、结构后,优选了八刀翼PDC绳索取心钻头类型、同时优化了孕镶金刚石钻头结构与钻进参数,改善泥浆流变及清洁性能,较好地解决了上述问题,提高了钻头时效及取心质量。最后终孔深度1829.44 m,终孔直径133 mm,钻获了直径≥78 mm的优质岩盐矿心,岩矿心平均采取率达到97.51%,为类似地质条件钾盐调查勘探提供一定的借鉴依据。JG-2 well is a geological survey well arranged by the Institute of Mineral Resources of the Chinese Academy of Geological Sciences in the Jinggu Depression Basin to further identify the potassium salt resources of the Mengye Well Formation in the Simao Basin.The designed well depth is 1800 m.The full hole coring technol⁃ogy adopts diamond and PDC rope coring techniques respectively.During construction,there are frequent and repeated alternations of rock salt,mudstone,sandstone,and mudstone conglomerates,resulting in rapid changes in rock drillability and abrasiveness.The mechanical drilling speed of the drill bit is uneven,and the mud package and rock core are severely worn,which brings great difficulties to the selection of the drill bit and affects drilling efficiency.This article analyzes and summarizes the lithological characteristics of the encountered strata,as well as the types and structures of drill bits used.After that,the eight blade PDC rope coring drill bit type was selected,and the structure and drilling parameters of the impregnated diamond drill bit were optimized to improve the rheological and cleaning properties of the mud,effectively solving the above problems and improving the efficiency and quality of the drill bit and coring.The final depth of the final hole was 1829.44 m,with a final diameter of 133mm.High quality rock salt cores with a diameter of≥78 mm were drilled,and the average recovery rate of the rock and ore cores reached 97.51%.This provides a certain reference for similar geological conditions of potassium salt investigation and drilling engineering.

关 键 词：钾盐调查 泥砾岩盐 岩层互层频繁 钻头应用与优化 大斜齿金刚石钻头 

分 类 号：P634[天文地球—地质矿产勘探]