摘要
为了解决淮南煤田小口径绳索取心钻进过程中遇到的各种工程问题,研制了大口径绳索取心钻进钻具组合装置,并且通过计算和现场试验确定了钻进参数。该钻具组合为:108 mm主动钻杆+114 mm钻杆+140 mm钻铤+127 mm绳索取心外管+146 mm PDC钻头。通过增大孔壁与钻杆之间的环状间隙,保证煤粉能及时排出,防止“抱钻”;通过增大外管与内管之间的环状间隙,保证内管提拉顺畅;通过增大钻杆及接头的强度,防止钻杆折断;通过增加钻铤数量,提高钻具运行的稳定性和减小孔斜。主要钻进参数为:钻压15~20 kN,转速80~90 r/min,泵量1000~1300 L/min,钻进煤层时泵量减少40%。现场试验表明,岩石地层中钻进的最高钻速为6.0 m/h,钻头寿命达500 m,钻进过程中没有出现“抱钻”、折断钻具和内管提不上来的事故,煤心采取率达96%。
In order to solve various engineering problems encountered in the process of small diameter wireline core drilling in Huainan Coalfield,a large diameter bottom hole assembly(BHA)for wireline core drilling and the drilling parameters were determined by calculation and field tests.The bottom hole assembly is:108 mm drive pipe+114 mm drill pipe+140 mm drill collar+127 mm outer tube for wireline coring+146 mm PDC drill bit.The technical principles are:by increasing the annular gap between hole wall and drill pipe to ensure the pulverized coal power can be discharged in time and prevent“holding drill pipe”;by increasing the annular gap between outer tube and inner tube to ensure the inner pipe can be lifted smoothly;by increasing the strength of drill pipe and joints to prevent drill pipe breakage;and by increasing the number of drill collars to improve the stability of drilling tool in operation and reduce hole inclination.The drilling parameters are:drilling pressure 15~20 kN,rotate speed 80~90 r/min,pump volume 1000~1300 L/min,the pump volume is reduced by 40%when drilling in coal seam.The field test shows that the maximum drilling speed in rock formations is 6.0 m/h and the bit life reaches 500 m.There is no accidents such as“holding drill pipe”,drill pipe breakage or inability to lift the inner pipe during drilling process,and the coal core recovery rate reached up to 96%.
作者
杨洋
许蕾
谢焰
李显春
李华
马小敏
毕峰
高德燚
YANG Yang;XU Lei;XIE Yan;LI Xianchun;LI Hua;MA Xiaomin;BI Feng;GAO Deyi(The First Exploration Team of Anhui Coalfield Geology Bureau,Huainan 232052,Anhui,China;College of Earth and Environment,Anhui University of Science and Technology,Huainan 232001,Anhui,China;National Key Laboratory for Fine Exploration and Intelligent Development of Coal Resources,College of Geoscience and Surveying Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China)
出处
《地质装备》
2025年第6期33-39,共7页
Equipment for Geotechnical Engineering
基金
国家自然科学基金项目(编号:U1810201)
安徽省煤田地质局重点科研项目(编号:2023001)。
关键词
绳索取心钻进
钻具组合
钻进参数
煤田
wireline core drilling
bottom hole assembly(BHA)
drilling parameter
coalfield
