钻探工程2024，Vol.51Issue(z1)：78-84,7.DOI:10.12143/j.ztgc.2024.S1.011
提钻取心岩心堵塞形态分析与防堵方法探讨
Analysis of core blockage morphology and exploration of anti-blockage methods in trip round coring
摘要
Abstract
During core drilling,it is common to encounter fractured or fragile formation.When the core enters the drill bit,due to the disappearance of confining pressure and the release of geostress,the core will break into blocks along the fractures.When entering the core tube,it forms a blockage form whcih hinders the entry of the subsequent core into the tube.In severe cases,the core will wear and consume each other,resulting in insufficient core recovery rate and the missing of formation data.Core blockage has become an important factor affecting core quality and drilling efficiency in core drilling.The state of core fragmentation and blockage morphology are complex,and it is difficult to grasp the mechanism of core blockage under the dynamic interference of drilling tools during drilling,making the core unblocking a major challenge in core drilling.By establishing a theoretical model of core blockage morphology,this paper analyzes the typical blockage morphology and variation patterns formed in the core tube after core fragmentation,suggestions on coring parameter specifications for formations prone to blocking are posed,and based on the typical core blockage patterns listed,the anti blockage methods are put foward and discussed.关键词
提钻取心/易堵心地层/岩心堵塞/堵心识别/防堵方法Key words
trip round coring/formation prone to plugging/core blockage/core blockage identification/anti-blockage methods分类
天文与地球科学引用本文复制引用
曹龙龙,张恒春,闫家,吴纪修,赵俊杰..提钻取心岩心堵塞形态分析与防堵方法探讨[J].钻探工程,2024,51(z1):78-84,7.基金项目
自然资源部定向钻井工程技术创新中心开放课题"绳索定向取心钻具分动机构方案设计及试验研究"(编号:PY202305) （编号:PY202305）
中国地质调查局地质调查项目"甘肃北山铜镍金矿高效精准勘探技术研究"(编号:DD20242017) （编号:DD20242017）
