KT178 型取心钻具在共和干热岩钻井中的应用  

Application of the KT178 core tool in Gonghe hot dry rock exploratory wells

作　　者：张恒春[1] 王稳石[1] 李宽[1] 王跃伟[1] 闫家[1] 曹龙龙 胡晨 ZHANG Hengchun;WANG Wenshi;LI Kuan;WANG Yuewei;YAN Jia;CAO Longlong;HU Chen(Institute of Exploration Techniques,CAGS,Langfang Hebei 065000,China;Chinese Academy of Geological Sciences,Beijing 100037,China)

机构地区：[1]中国地质科学院勘探技术研究所,河北廊坊065000 [2]中国地质科学院,北京100037

出　　处：《钻探工程》2021年第2期29-34,共6页Drilling Engineering

基　　金：中国地质调查局地质调查项目“共和盆地恰卜恰干热岩试验性开发与评价(中国地质科学院勘探技术研究所)”(编号:DD20190136);“松辽盆地基底探测与高温监测环境的建立(中国地质科学院勘探技术研究所)”(编号:DD20189703);“苏皖赣地区页岩油气战略选区调查(中国地质科学院勘探技术研究所)”(编号:DD20201171);中国地质科学院勘探技术研究所科技资助项目“大直径孕镶金刚石取心钻头制备工艺研究”(编号:YB202003)。

摘　　要：青海共和盆地干热岩资源富集于花岗岩地层,硬度高,研磨性强,部分层段裂隙发育,取心困难。针对干热岩地层和取心需求特点,研制了一套KT178型取心钻具,并配套设计了孕镶金刚石取心钻头。该钻具为单动双管取心钻具,可配套井底动力钻具使用,设计中注重对钻具外管、卡簧等关键部件的强度校核。在GH-01井和GH-02井中,经过两轮试验和优化,钻具逐渐成熟,获取了较完整的岩心样本,满足干热岩勘探取心要求,具备了向页岩气、水资源勘察等具有间断取心需求的同类工程推广应用的条件。In Gonghe Basin,hot dry rock resources are enriched in granite strata with high hardness and strong abrasiveness,and well developed cracks over some well sections,which leads to difficult core drilling.According to the characteristics of hot dry rock formation and coring demand,the KT178 coring tool was developed,and the impregnated diamond coring bit was designed.The drilling tool was a swivel type double tube core barrel,which can be used with the down⁃hole motor.The strength check of key components,such as outer barrel,core catcher,was emphasized in the design.The drilling tools have been improved and established through two rounds of experiments and optimization at Well GH-01 and GH-02 with fairly intact core samples obtained,meeting the requirements for coring in hot dry rock exploration.The drilling tools can be extended to similar projects with intermittent coring requirements,such as exploration of shale gas and water resources.

关 键 词：干热岩 取心钻进 取心钻具 取心钻头 坚硬地层 共和盆地 

分 类 号：P634[天文地球—地质矿产勘探] TE249[天文地球—地质学]