CAJ | 학술논문

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一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,内筒上端连接有球座分水接头和悬挂总成,内筒下端连接有内筒密闭球阀;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.选取陕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.
현유매광정하매층기함량측시취양장치재제심과정중매심폭로,치사손실기측산불준,영향매층기함량측정정도,이유기전상사용적밀폐(보압)취심장치수재지면배합승색취심공구사용,차비용고앙,불괄합정하매층.USC-Ⅰ형매광정하매층밀폐취심장치위일개쌍통단동식취심기,포괄의차련접적취심찬두、외통화찬간접두;외통내현괘유내통,내통상단련접유구좌분수접두화현괘총성,내통하단련접유내통밀폐구벌;내통화외통지간설치유액압관폐궤구,액압관폐궤구상단여구좌분수접두상련접,하단여관폐구벌반활배상련접.선취협서빈장광업집단호가하매광작위현장응용지점,이해광정주채적4#매층작위취심측시대상,이용시공구적1개찬공,분별진행료보통취심통화밀폐취심장치측정기함량,측정결과표명:해취심장치가사매심재제취과정중처우밀폐상태,감소양품중적기체손실,유효제고매광정하매층기함량측정적준학성.
The underground sampling facilities now available for CBM content test in coalmines have a defect of coal core exposing, thus caused incorrect measuring of lost gas, and impact CBM content measuring accuracy;while the airtight (pressure-tight) coring fa-cilities used in oil and gas fields should be matched with wire-line coring tools on surface, thus expensive and unfit for underground coal seams. The USC-1 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 No.4 as the coring test target, 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.