空气冲击钻在大口径采动井施工技术研究  

Research on Construction Technology of Air Percussion Drilling in Large-diameter Mining Well

作　　者：李必智 张强 赵江鹏 徐堪社 LI Bi-zhi;ZHANG Qiang;ZHAO Jiang-peng;XU Kan-she(Xi′an Research Institute,China Coal Technology and Engineering Group Corp.,Xi′an 710077,China)

机构地区：[1]中煤科工集团西安研究院有限公司,西安710077

出　　处：《煤炭技术》2021年第1期9-12,共4页Coal Technology

基　　金：中煤科工集团西安研究院有限公司科技创新基金项目(2016XAYZD03);国家重点研发计划课题(2018YFC0808202)。

摘　　要：针对煤层气地面大口径采动井施工中遇含水、局部塌孔地层发生井壁失稳、井内岩屑返排不净及接钻杆时井底岩粉倒灌堵塞钻头的问题。开展并形成了以改进钻具组合为核心,改变加接钻杆方式等工艺的配合。结合现场实践,成功解决了钻遇强富含水层钻头堵塞、岩屑上返的难题,在提速方面取得了良好的效果,钻井周期明显缩短,经济效益明显提高。Aiming at the problems of wellbore instability in water-bearing and partially collapsed borehole strata,the back-discharge of cuttings in the well and the back-flow of rock powder at the bottom of the well when connecting with the drill pipe during the construction of large-diameter production well of coal-bed gas. The cooperation of improving BHA as the core and changing the way of adding and connecting drill pipe is developed and formed. Combining with the field practice, the problem of drilling bit blocking and cuttings returning in strong water-rich formation is successfully solved, and good results are achieved in speed-up, drilling cycle is obviously shortened and economic benefit is obviously improved.

关 键 词：空气钻进 大口径采动井 裂隙漏失 井壁坍塌 气体泄漏量 

分 类 号：TE28[石油与天然气工程—油气井工程]