涪陵空气反循环钻井双壁钻杆冲蚀研究  

Study on Washout of Dual—Wall Drill Pipe in Air Reverse Circulation Drilling in Fulling Area

作　　者：刘俊君 LIU Junjun(Shale Gas Production Technique Service Company of Sinopec Oilfield Service Jianghan Corporation,Wuhan,Hubei,430223,China)

机构地区：[1]中石化江汉石油工程有限公司页岩气开采技术服务公司,湖北武汉430223

出　　处：《江汉石油职工大学学报》2020年第6期30-33,共4页Journal of Jianghan Petroleum University of Staff and Workers

摘　　要：空气反循环钻井技术在高速气体携带岩屑上返过程中会对双壁钻杆造成冲蚀磨损,严重时会引发钻井复杂情况。根据气体携岩两相管流理论,对微单元岩屑颗粒进行力学分析,建立群体岩屑流的冲蚀模型,得到钻进时双壁钻杆不同位置处的压力和磨损冲蚀量表达式。反循环钻井双壁钻杆冲蚀磨损量与井深、岩屑浓度、机械钻速和注气量等因素有关,冲蚀磨损量随着井深的增大而减小,随着机械钻速、岩屑浓度和注气量的增大,双壁钻杆冲蚀磨损量也增大。为了有效控制钻进时的岩屑对双壁钻杆冲蚀磨损量,应在满足钻井条件的条件下,采用合理的机械钻速和注气量。Air reverse circulation drilling technology will cause washout and wear to dual-wall drill pipe in the process of return of high-speed gas-carrying cuttings.According to the theory of two-phase pipe flow of gas-carrying cuttings,the mechanical analysis of micro-element cuttings particles is conducted,and a washout model of mass cuttings flow is established,so that a function of pressure and washout magnitude is obtained at different positions of dual-wall drill pipe.The washout wear magnitude of the dual-wall drill pipe in reverse circulation drilling is related to the factors such as well depth,cuttings concentration,ROP and gas injection.The washout wear decreases with the increased well depth,and increases with the increase of ROP,cuttings concentration and gas injection.In order to effectively control the washout wear of the cuttings on the dual-wall drill pipe during drilling,reasonable ROP and gas injection should be adopted under the drilling conditions.

关 键 词：空气反循环钻井 双壁钻杆 气固两相流 

分 类 号：TE242.6[石油与天然气工程—油气井工程]