地质与勘探2024，Vol.60Issue(6)：1217-1227,11.DOI:10.12134/j.dzykt.2024.06.011
贵州省贞丰县金矿勘查小口径定向分支钻进技术
The Small-Bore Directional Branch Drilling Technology in Gold Exploration of Zhenfeng County,Guizhou Province
摘要
Abstract
The Zhexiang No.2 gold mine in Zhenfeng County is one of the large precision exploration projects of key mineral resources in Guizhou Province.During the implementation of the drilling project,the designed well ZK61724 cannot be constructed because it is located in the Class I water source protection zone.In order to solve this problem,the"small-bore directional branch hole drilling technology"was used to implement directional branch holes from the adjacent well ZK61708,which sidetracked to the target stratum of well ZK61724,and finally drilled accurately to the target point.The following results have been obtained through small-bore directional branch drilling test in middle-hard strata of Guizhou Province.(1)For bit types,the use of diamond-mounted bit in branch window sidedrilling stage has realized the best effect,and the use of flat-bottom PDC bit in incline stabilization stage has the most ideal effect.(2)For the bending degree of bending tools,in the window sidetracking stage,the best results can be obtained by using 1.5°～2°bending outer pipe;in the increasing and stabilizing inclination drilling stage,the best results can be achieved by using 1°～1.5°bending outer pipe with wireline MWD tools,so as for 0.5°～1°bending outer pipe with wireless MWD tools.(3)The control threshold of safe angle building hole rate is 6°/30 m when using a wireline core drill pipe.(4)The performance of the electromagnetic wave wireless MWD is stable,and the shock absorption structure of the wireline fiber optic gyro MWD needs to be improved.The small-bore directional branch hole drilling technology can promote the innovation and progress of exploration concepts and methods,implement the concept of green exploration and less damage from the source,and effectively save drilling costs.This paper describes the key points of small-bore directional branch hole drilling technology,which can provide reference for the popularization and application of this technology.关键词
金矿勘查/小口径/定向分支钻进/钻头选型/螺杆度数/造斜强度/贞丰县/贵州省Key words
gold mine exploration/small bore/directional branch hole drilling/selection of bit type/deflection degree of screw/angle building hole rate/Zhenfeng County/Guizhou Province分类
天文与地球科学引用本文复制引用
宋继伟,冉飞,方青,田鹏辉,张恒春..贵州省贞丰县金矿勘查小口径定向分支钻进技术[J].地质与勘探,2024,60(6):1217-1227,11.基金项目
贵州省科技计划项目"贵州省岩溶地区复杂地层岩心钻探关键技术难题综合研究"(编号:黔科合支撑[2023]一般173号)、贵州省地矿局地质科研项目"贵州省优势矿产资源勘查岩心钻探关键技术难题综合研究"(编号:黔地矿科合[2022]4号)和"地质勘查岩心钻探新型式钻机的引进及改良设计研究"(编号:黔地矿科合[2023]6号)联合资助. （编号:黔科合支撑[2023]一般173号）
