钻探工程2025，Vol.52Issue(5)：67-75,9.DOI:10.12143/j.ztgc.2025.05.009
碎软煤层密闭保压取心钻具的设计与室内试验
Design and preliminary experiment of sealed pressure-holding coring tool for crushed soft coal seam
摘要
Abstract
Coalbed methane content is a critical parameter for characterizing coal reservoir properties.The most direct and effective way to improve the accuracy of the test results of coalbed methane content is to use sealed pressure-holding coring technology,wherein the coal core sample is sealed inside the drilling tool and lifted to the ground for desorption.This paper proposes a technical scheme for a wireline-retrievable lifting and tilting ball valve type sealed pressure-holding coring drilling tool used for crushed soft coal seams.The working mechanism and key technologies of the sealed pressure-holding coring drilling tool are studied,and the overall structural scheme of the sealed pressure-holding coring drilling tool,the structural design calculation of the main components,preliminary indoor experiments,and optimization improvement plans are elaborated in detail.Research and experiments have shown that the sealed pressure-holding coring drilling tool has a simple structure,good sealing effect,easy operation,and can obtain the maximum feasible core diameter(a core diameter of 50mm can be obtained from a 118mm diameter borehole);The precise fit between the lever and the ring that drives the ball valve to flip is an important factor in determining whether the ball valve can smoothly flip and seal.关键词
碎软煤层/保压取心/密闭保压取心钻具/绳索打捞/翻转球阀Key words
crushed soft coal seam/pressure-holding coring/sealed pressure-holding coring tool/wireline coring recovery/tilting ball valve分类
天文与地球科学引用本文复制引用
卢春华,石家润,张涛,王荣璟,乔梦迪,鲁浩然,江昌禄..碎软煤层密闭保压取心钻具的设计与室内试验[J].钻探工程,2025,52(5):67-75,9.基金项目
战略性国际科技创新合作重点专项"天然气水合物勘查开发技术联合研究"(编号:2018YFE0208200) （编号:2018YFE0208200）
横向项目"碎软煤层地面保压取心钻探工具研发"(编号:MTKCY-2024-45) （编号:MTKCY-2024-45）
