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1、基于RFPA數(shù)值模擬的煤層水力壓裂技術研宄王景余河南神火集團煤業(yè)公司摘要:瓦斯災害嚴重制約著煤炭工業(yè)的發(fā)展,為丫保障煤礦安全生產,利用水力壓裂技術對煤層瓦斯進行抽排。采用理論分析與RFPA數(shù)值模擬的研宂方法,研宂了不同側應力系數(shù)對水力壓裂的拓展規(guī)律以及裂紋拓展長度分析。研宄得出:當入〈1時(垂直地應力大于水平地應力),裂隙的拓展方向為垂直方向;當入=1時(垂直地應力與水平地應力相近),裂隙的拓展方向雜亂無章;當X>1吋(垂直地應力小于水平地應力),裂隙的拓展方向為水平方向;隨著地應力差值的逐漸增大,起裂壓力逐漸變小,因此可以提前對壓裂鉆孔進行預處
2、理,使得鉆孔應力重新分布,來達到降低起裂壓力的目的。關鍵詞:RFPA數(shù)值模擬;水力壓裂;側應力系數(shù);拓展規(guī)律;起裂壓力;作者簡介:王景余(1963—),男,河南輝縣人,高級工程師,碩士,1984年畢業(yè)于焦作礦業(yè)學院,現(xiàn)從事煤炭建設與管理工作。收稿日期:2017-07-06StudyonhydraulicfracturingtechnologyofcoalseambasedonRFPAnumericalsimulationWangJingyuHenanShenhuoGroupCoalCo.,Ltd.;Abstract:Gasdisasterseve
3、relyrestrictsthedevelopmentofthecoalindustry,inordertoensurethesafeproductionofcoalmines,hydraulicfracturingtechnologywasadoptedtoextractgasfromcoalseams.ThetheoreticalanalysisandRFPAnumericalsimulationmethodwereusedtostudythelawofexpansionofhydraulicfracturingwithdifferentla
4、teralstresscoefficientsandtheanalysisofcrackpropagationlength.Thestudyfoundthat:When入<1(verticalstressisgreaterthanhorizontalstress),thedirectionofdevelopmentoffissureishorizontalvertical;When入=1(theverticalstressisclosetothehorizontalgroundstress),thedirectionoffracturedevel
5、opmentischaotic;When入〉1(verticalstressislessthanhorizontalgroundstress),thedirectionofdevelopmentoffissureishorizontal;Withthegradualincreaseofgroundstress,theinitiationpressuregraduallybecomessmaller,soitcanpre-treatmentoffracturedboreholesiscarriedoutinadvancesothatthestres
6、softheboreholeisredistributedtoachievethepurposeofreducingtheinitiationpressure.Keyword:RFPAnumericalsimulation;hydraulicfracturing;lateralstresscoefficient;extendedlaw;initiationpressure;Received:2017-07-06引用格式:王景余.基于RFPA數(shù)值模擬的煤層水力壓裂技術研宂[J].能源與環(huán)保,2017,39(11):242-245.WangJingy
7、u.StudyonhydraulicfracturingtechnologyofcoalseambasedonRFPAnumericalsimulation[J].ChinaEnergyandEnvironmentalProtection,2017,39(11):242-245.0引言煤炭是我國主體能源,瓦斯火害是目前煤礦面臨著嚴重問題,影響著我國煤炭工業(yè)的健康發(fā)展,據(jù)統(tǒng)計,瓦斯災害危害最大,事故率最高,iL可控性較差,嚴重制約煤礦的安全生產[1-2]。國內外學者對水力壓裂技術己經進行了大量的研宄,富向m對井下點式水力壓裂增透技術進行研宄,研宄了
8、剪應力、水壓力、水流量等參數(shù)的分布與演化;翟成等ui對煤層脈動水力壓裂卸壓增透技術進行了研宄,研宄了煤體原生裂隙在強烈的脈動水壓力作用下