晋城矿区采空区地面井井身结构优化分析及工程应用  

Optimization Analysis and Engineering Application of Wellbore Structure for Surface Wells in Goaf Areas of Jincheng Mining Area

作　　者：王争 WANG Zheng(State Key Laboratory of Coal and Coalbed Methane Co-mining,Shanxi 048012;Yi'an Lanyan Coal and Coalbed Methane Co-mining Technology Co.,Ltd.,Shanxi 030031)

机构地区：[1]煤与煤层气共采国家重点实验室,山西048012 [2]易安蓝焰煤与煤层气共采技术有限责任公司,山西030031

出　　处：《中国煤层气》2024年第6期3-7,共5页China Coalbed Methane

基　　金：山西省重点研发计划项目(202202080301010);山西省揭榜招标项目(20201101001);山西省科技重大专项项目(20201102001)。

摘　　要：实际生产中发现井身结构的稳定性对采空井抽采及后期增产改造等工艺环节至关重要,针对晋城矿区采空井二开段容易钻遇裂隙带及割缝套管容易倾斜等实际问题,提出了二开段终孔位置的计算方法;提出了一种悬挂式井身结构优化设计及施工工艺,现场实践表明优化后的井身结构不仅保证了井身结构的稳定性,而且大幅度降低了后期通洗井等增产改造修井作业难度,修井前试验1井相比试验2井平均日产气量增加约6%;修井后平均日产气量增加约44%。Field production reveals that the stability of the wellbore structure is very important to the process of gas drainage and later stimulation for goaf wells.To address practical issues such as frequent encountering fracture zones during the second borehole section and inclination in the slotted casings of the goaf wells in Jincheng Mining Area,an accurate calculation method for the final hole position of the sec-ond borehole section is proposed.Additionally,an optimized design of hanging-type wellbore structure and construction technology is proposed.Field practice shows that the optimized wellbore structure not only ensures the stability of the well structure but also significantly reduces the difficulty of subsequent well workover operations for production enhancement,such as well opening and hydraulic punching.Compared to the No.2 Test Well,the average daily gas production of the No.1 Test Well increased by a-bout 6%before well workover,and by about 44%after well workover.

关 键 词：晋城矿区 采空区地面井 终孔位置计算 悬挂式井身结构 

分 类 号：TD263[矿业工程—矿井建设]