煤矿井下煤层密闭取心装置 -学兔兔 www.xuetutu.com.pdf

第27卷7期
中国煤炭地质
Vol 27 No0
2015年7月
COAL GEOLOGY OF CHINA
2015
doi:10.39695 1.Issn.1674-1803.2015.07.20
文章编号:1674-1803(2015)07-0080-02
煤矿井下媒层密闭取心装置
张丁亮
中煤科工集闭西安研究院有限公司煤层气所,陕西西安710054)
摘要:现有煤矿井下煤层气含量测试取样装置在提心过程中煤心暴露,致使损失气测算不准,影响煤层气含量测
定精度,而油气田上使用的密闭(保压)取心装置需在地面配合绳索取心工具使用,且费用高昂,不适合井下煤层。
USC-I型煤矿井下煤层密闭取心装置为ー个双筒单动式取心器,包括依次连接的取心钻头、外筒和钻杆接头;外
筒内悬挂有内筒,内飴上端连接有球座分水接头和悬挂总成,内筒下端连接有内简密闭球阀;内筒和外筒之间设置
有液压关闭机构、液压关闭机构上端与球座分水接头相连接、下端与关闭球阀半滑环相连接。选取映西彬长矿业
集团胡家河煤矿作为现场应用地点,以该矿井主采的4煤层作为取心测试对象,利用施工区的1个钻孔,分别进行
了普通取心筒和密闭取心装置测定气含量,测定结果表明:该取心装置可使煤心在提取过程中处于密闭状态,减少
样品中的气体损失、有效提高煤矿井下煤层气含量测定的准确性。
关键词:煤矿井下密闭取心;结构;工作原理;现场应用
中图分类号:P634.4:3
文献标识码
Study on Coal Seam Airtight Coring Facility in Coalmine
Zhang Dingliang
(Xian Researeh Institute, China Coal Technology & Engineering Group Corp, Xian Shaanxi 710054)
Abstract: The underground sampling facilities now available for CB M content test in coalmines have a defect of coal core exposing.
thus caused incorrect measuring of lost gas, and impac CBM content measuring accuracy; while the airtight(pressure-tight)coring a
cilities used in oil and as fields should be matched with wire-line coring tools on surface, thus expensive and unfit for underground
coal seams. The USC-I coalmine underground airtight coal coring facility is a swivel barrel corer, including coring bit, outer barrel and
drill rod sub connected in turn; within outer barrel, an inner barrel hanging, on upper end of inner barrel connected a ball-seat swivel
and hanging assemblage, on lower end connected an inner barrel airtight ball valve; a hydraulic closing setup installed between inner
and outer barrels; the upper end of hydraulic closing setup connected with ball-seat swivel, while the lower end connected with closing
ball valve semi-slip ring. Taking the Hujiahe coalmine of the Shaanxi Binchang Mining Group as the application site, main mineable
coal No4 as the coring test Larget, using a borehole in the site carried out common coring barrel and airtight coring facility gas content
determination respectively, the result has shown that the later can make the coal core under airtight status during the coring, thus can
reduce sample gas loss, thus can effectively improve coalmine underground CBM content measuring accuracy.
Key words: coalmine underground airtight coring; configuration; operation principle; site application
煤层气含量测定是煤层气资源勘探、开发以及成损失气量的估算存在较大误差,降低了煤层气含
矿井瓦斯综合治理等领域一项重要工作。准确获取量测定的准确性。现有密闭取心、保压取心的设备
煤层气含量数据对评价煤层气资源量、编制煤层气和技术工.艺,多应用于油田的勘探开发和天然气水
资源开发方案以及矿井开采设计、瓦斯灾害综合治合物取心领域,一般在地面配合绳索取心工具使用
理意义重大。
但费用高昂,不适合于煤矿井下煤层的密闭取心
日前,我国煤层气含量多直接采取煤样,通过研采用USC-I型煤矿井下煤层密闭取心装置进行煤
究解吸规律的方法直接测定、计算煤层气含量。常层密闭取心,可以较大幅度提高煤矿井下煤层气含
规取心筒取样测试提心耗时长,煤心长时间暴露,造量测定的准确度。
基金项目:国家科技重大专项编号:2017X06040-00国家重点基1装置结构及工作原理
研究发展计刘(973计划)(编号:2009CB219602
1.1装置结构
作者简介:张丁亮(1978-),男,陕西西安人,工程师,主要研究方向
为煤层气开发地质及煤层气钻井工程。
煤矿井下煤层密闭取心装置结构如图1所示
收稿日期:2015-04-10
该装置为一个双简单动式取心器,从左至右依
责任编蟹:樊小舟
次连接钻杆接头、外筒和底喷式取心钻头;外筒内悬