含瓦斯煤層水力致裂的瓦斯驅(qū)趕現(xiàn)象

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1、含瓦斯煤層水力致裂的瓦斯驅(qū)趕現(xiàn)象含瓦斯煤層水力致裂的瓦斯驅(qū)趕現(xiàn)象黃炳香1程慶迎2張統(tǒng)1陳樹(shù)亮1薛偉超11中國(guó)礦業(yè)大學(xué)深部煤炭資源開(kāi)采教育部重點(diǎn)實(shí)驗(yàn)室江蘇徐州221008510152025303540452中國(guó)礦業(yè)大學(xué)安全工程學(xué)院江蘇徐州221008摘要含瓦斯煤層水力致裂在產(chǎn)生水壓裂縫的同時(shí)壓力水向裂縫兩側(cè)滲透孔隙水壓力與孔隙裂隙內(nèi)的游離瓦斯接觸引起裂縫圍巖內(nèi)孔隙水和瓦斯壓力的變化孔隙壓力分布的不均勻會(huì)產(chǎn)生孔隙壓力梯度游離態(tài)瓦斯由孔隙瓦斯壓力高的位置向孔隙瓦斯壓力低的位置運(yùn)移稱之為瓦斯驅(qū)趕現(xiàn)象煤礦井下高瓦斯煤層注水常會(huì)引起回風(fēng)流瓦斯?jié)舛扔幸欢ǖ纳哌@是煤層注水驅(qū)趕

2、瓦斯導(dǎo)致的結(jié)果突出煤層掘進(jìn)工作面深孔水力致裂后后續(xù)掘進(jìn)過(guò)程中煤體瓦斯含量呈現(xiàn)低-高-低的現(xiàn)象驗(yàn)證了含瓦斯煤層水力致裂瓦斯驅(qū)趕現(xiàn)象的存在瓦斯壓力梯度是煤層水力致裂驅(qū)趕瓦斯的根本動(dòng)力水壓裂縫擴(kuò)展的不均勻性和瓦斯驅(qū)趕的時(shí)間效應(yīng)會(huì)引起瓦斯驅(qū)趕的不均勻因此一方面應(yīng)根據(jù)瓦斯驅(qū)趕的基本原理優(yōu)化水力致裂注水參數(shù)采用均勻水力致裂技術(shù)避免水力致裂瓦斯驅(qū)趕造成的不良影響另一方面應(yīng)利用瓦斯驅(qū)趕現(xiàn)象提出了本煤層水力致裂增透驅(qū)趕與隔間鉆孔抽采瓦斯技術(shù)沿空掘巷水力致裂驅(qū)趕區(qū)域消突與穿煤柱鉆孔抽采驅(qū)趕至采空區(qū)的瓦斯技術(shù)關(guān)鍵詞含瓦斯煤層水力致裂孔隙壓力梯度瓦斯驅(qū)趕中圖分類號(hào)TD821Methane

3、drivenphenomenonofhydraulicfracturinginmethane-bearingcoalseamHUANGBingxiang1CHEGNQingying2ZHANGTong1CHENShuliang1XUEWeichao11KeyLaboratoryofDeepCoalResourceMiningMinistryofEducationofChinaChinaUniversityofMiningandTechnologyJiangSuXuZhou2211162FacultyofSafetyEngineeringChinaUniversit

4、yofMiningandTechnologyJiangSuXuZhou221116AbstractWhilehydrauliccrackscomingintobeingbecauseofhydraulicfracturinginmethane-bearingcoalseampressurewaterpenetratesintobothsidesofthecracksThentheporewatercomeintocontactingwiththefreemethanewithintheporecrackscausingpressurechangesofporewa

5、terandmethaneinsurroundingrockofthecrackTheunevendistributionoftheporepressureformstheporepressuregradientThefreemethanemigratingfromthepositionofhighporemethanepressuretothepositionoflowporemethanepressureiscalledmethanedrivenphenomenonThemethaneconcentrationofthereturncurrentwillalw

6、aysbeimprovedtoacertaindegreecausedbythewaterinjectiontothehighmethanecoalseamintheundergroundcoalmineItistheresultofmethanedrivenduetocoalseamwaterinjectionAfterthedeep-holehydraulicfracturingattheheadingfaceofthecoalandmethaneoutburstcoalseamthecoalmethanecontentshowsa"low-high-low"

7、phenomenoninthefollowingadvancingprocessverifyingtheexistenceofmethanedrivenphenomenoncausedbythemethane-bearingcoalseamhydraulicfracturingThemethanepressuregradientisthefundamentaldrivingforcetomethanedrivenofseamhydraulicfracturingTheunevenwaterpressurecrackpropagationandthetimeeffe

8、ctSom