龙威成,孙四清
LONG Weicheng, SUN Siqing

• 1:中煤科工集团西安研究院有限公司，陕西 西安 710077

摘要(Abstract)：

煤层气含量是煤层气资源开发利用和矿井瓦斯防治的重要技术参数，针对地面井煤层气含量测定过程中因煤心损失气量估算不准导致的煤层气含量测定结果偏差问题，研制了地面井煤层绳索密闭取心装置，提出了地面井煤层绳索密闭取心技术工艺。煤层绳索密闭取心装置上端设计绳索投捞接口，配套设计绳索投捞工具串和绳索提升系统，实现取心内筒组件的快速下放与提升；采用液压推动头直接推动取心内筒下行、取心钻头与取心内筒配合的方式达到球阀旋转关闭的目的，在保证足够的取心内筒容积和过流环空间隙的同时，将密闭取心装置外径最小化（ø114 mm），配套ø127 mm取心钻头，使整套密闭取心装置适用较多井型。选择晋城矿区（中硬、高变质、高瓦斯煤层）地面煤层气抽采检验井进行煤（岩）层绳索密闭取心试验，测试结果表明，煤层绳索密闭取心样品空气干燥基气含量为常规（绳索）取心样品气含量测值的1.12~1.17倍，绳索提心速度为63.60~66.92 m/min。地面煤层气井绳索密闭取心技术提高了煤层气含量测定准确度，实现快速提心、精准测定地面井煤层气含量之目的。
Coalbed methane content is an important technical parameter for the development and utilization of coalbed methane resources and the prevention and control of mine gas. In order to solve the problem of deviation of coalbed methane content measurement results caused by inaccurate estimation of coal core loss gas volume in the process of surface well coalbed methane content determination, the wireline sealing coring device for surface well coal seam is developed, and the wireline sealing coring technology for surface well coal seam is proposed. The upper end of the coal seam wireline sealing coring device is designed with wireline fishing interface, wireline fishing tool string and rope lifting system to realize the rapid lowering and lifting of coring inner cylinder components；the hydraulic driving head is used to directly push down the coring inner cylinder, and the coring bit is matched with the coring inner cylinder to achieve the purpose of rotating closing the ball valve, so as to ensure sufficient coring inner cylinder volume and annulus, at the same time, the outer diameter of the closed coring device is minimized(only ø114 mm), and a ø127 mm coring bit is equipped to make the whole set of closed coring device suitable for more well types. The surface wells in Jincheng mining area(medium hard, high metamorphic and high gas coal seam) were selected to carry out wireline sealed coring test in coal(rock) layer. The field coring and sample test results show that the coalbed methane content of wireline sealed coring is about 1.12-1.17 times of that of conventional(wireline) coring gas content, the lifting speed of the wireline is 63.60-66.92 m/min. The determination wireline sealed coring technology improved the accuracy of coalbed methane content determination and realized rapid core lifting and accurate determination coalbed methane content in surface wells.

关键词(KeyWords)： 密闭取心;绳索提心;煤层气含量;中硬煤层;抽采效果检验;晋城矿区
sealed coring;wireline coring;coalbed methane content;medium hard coal seam;test of pumping effect;Jincheng mining area

Abstract:

Keywords:

基金项目(Foundation): 国家科技重大专项任务（2016ZX05045-002-002）；中煤科工集团西安研究院有限公司科技创新基金项目（2018XAYZD09）；天地科技股份有限公司科技创新创业资金专项项目（2020-TD-MS010）

作者(Author): 龙威成,孙四清
LONG Weicheng, SUN Siqing

DOI: 10.3969/j.issn.1001-1986.2021.03.017

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