钻探工程2025，Vol.52Issue(2)：144-150,7.DOI:10.12143/j.ztgc.2025.02.019
破碎地层取心技术研究与应用
Research and application of coring technology in broken formations
摘要
Abstract
In the present core drilling project,there are still some problems such as low core recovery rate and low coring efficiency in broken formations.In this paper,the broken strata are classified into hard broken,soft broken,brittle broken and loose broken according to the lithology and broken reasons.The problems of core erosion,blocking,grinding and loss are analyzed.It is thought that the main reasons to coring problems in broken areas are as follows,in the hard broken strata,the core tube is blocked due to the core broken and vollume increase,in the loss broken strata,the drilling fluid erodes the cores,which both exist in the soft broken and brittle broken strata,moreover,it is not easy to be discovered because of the high drilling speed.The contermeasures are as follows:coring technology of low WOB,low RPM,low pump pressure and high performance water-based polymer drilling fluid,anti-erosion core bit,compound core claw,and double pipe single action wireline coring tool.The relevant technology was applied in ZG1 coal seam coring in Songjiaying south comprehensive gas survey,Tangshan City,Hebei Province,and the core recovery rate in the coal seam was reached to 98.77%,which has certain referential value to core drilling in similar strata.关键词
破碎地层/阶梯式取心钻头/复合岩心爪/煤层取心Key words
broken formations/stepped coring bit/compound core claw/coal seam coring分类
天文与地球科学引用本文复制引用
白云勃,高亮,李婕,王久全,黄伟艇,赵岩,张爱堂,段昱玮,朱华鑫..破碎地层取心技术研究与应用[J].钻探工程,2025,52(2):144-150,7.基金项目
自然资源部复杂条件钻采技术重点实验室与金石钻探(唐山)股份有限公司2023开放课题"破碎地层取心技术研究"(编号:FZJS230207) （唐山）
