第35卷1期2023年1月中国煤炭地质COALGEOLOGYOFCHINAVol.35No.1Jan.2023doi:10.3969/j.issn.1674-1803.2023.01.05文章编号:1674-1803(2023)01-0025-07煤层顶板水平井分段压裂瓦斯治理模式研究王博1,2,姜在炳1,杜天林1,贾立龙1,牟全斌1,杨建超1,陈崇枫1,李浩哲1(1.中煤科工集团西安研究院有限公司,陕西西安710054;2.西安科技大学,陕西西安710054)摘要:针对煤矿碎软低渗煤层,提出了煤层顶板水平井分段压裂瓦斯治理模式。通过建立应力-渗流-损伤耦合的理论模型,运用数值模拟的方法模拟了煤层顶板水平井水力压裂裂缝扩展过程,结果表明紧邻煤层顶板岩石的裂缝能够延展至煤层,且在顶板岩石的撕裂作用下,煤层内的裂缝能够快速延展。应用产能模拟的方法对分段压裂水平井的产能进行了模拟,分析瓦斯抽采的效率,优选了分段压裂的压裂缝长度、压裂段数,认为在淮北矿区祁东煤矿的地质条件下,压裂裂缝的长度为80m,裂缝间距为63m,抽采效果最佳。通过工程验证,说明煤层顶板水平井分段压裂技术是国内碎软低渗煤层地面瓦斯高效抽采的有效模式。关键词:水平井;瓦斯抽采;裂缝扩展规律;产能模拟中图分类号:TE19文献标识码:AStudyonGasControlModeofStagedFracturingHorizontalWellsinCoalSeamRoofWANGBo1,2,JIANGZaibing1,DUTianlin1,JIALilong1,MUQuanbin1,YANGJianchao1,CHENChongfeng1,LIHaozhe1(1.Xi’anResearchInstituteofChinaCoalTechnology&EngineeringGroupCorp.,Xi’an,Shaanxi710054;2.Xi’anUniversityofScienceandTechnology,Xi’an,Shaanxi710054)Abstract:Aimingatthebrokensoftandlowpermeabilitycoalseam,gascontrolmodeofstagedfracturinghorizontalwellsincoalseamroofisproposed.Throughtheestablishmentofthetheoreticalmodelofstressseepagedamagecoupling,thehydraulicfracturingcrackpropagationprocessofthehorizontalwellincoalseamroofissimulatedbyusingthenumericalsimulationmethod.Theresultsshowthatthecracksintheroofrockadjacenttothecoalseamcanextendtothecoalseam,andthecracksincoalseamcanexpandrapidlyunderthetearingactionoftheroofrock.Theproductivitysimulationmethodisusedtosimulatetheproductivityofstagedfracturinghorizontalwells,analyzetheefficiencyofgasextraction,optimizethelengthoffracturingfracturesandthenumberoffracturingsectionsforstagedfracturing.UnderthegeologicalconditionsofQidongCoalMinei...
