五陽礦低透氣煤層水力壓裂卸壓增透技術(shù)研究及應(yīng)用

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1、論文題目：五陽礦低透氣煤層水力壓裂卸壓增透技術(shù)研究及應(yīng)用專業(yè)：安全技術(shù)及工程碩士生：馬瑞峰（簽名）______________指導(dǎo)教師：李樹剛（簽名）______________許滿貴（簽名）______________摘要我國(guó)煤層普遍具有低透氣性的特點(diǎn)，使得煤層瓦斯抽采效率低下，嚴(yán)重影響煤礦安全生產(chǎn)。針對(duì)五陽煤礦高瓦斯低透氣性煤層瓦斯抽采難題，提出了水力壓裂卸壓增透瓦斯抽采技術(shù)。采用理論分析、實(shí)驗(yàn)室分析和數(shù)值模擬方法對(duì)水力壓裂裂縫起裂、擴(kuò)展機(jī)理以及水力壓裂卸壓增透效應(yīng)進(jìn)行分析，在此基礎(chǔ)上，結(jié)合五陽煤礦現(xiàn)場(chǎng)工業(yè)試驗(yàn)確定了合適的水力壓裂技術(shù)工

2、藝參數(shù)，為五陽煤礦高瓦斯低透氣性煤層瓦斯抽采提供了理論依據(jù)和技術(shù)支持。通過水力壓裂理論分析闡明了裂縫起裂壓力和裂縫長(zhǎng)度的理論計(jì)算模型，結(jié)合煤巖全應(yīng)力—應(yīng)變過程滲透性試驗(yàn)揭示了水力壓裂卸壓增透作用機(jī)理；采用RFPA數(shù)值模擬方法研究了五陽煤礦水力壓裂起裂壓力和裂縫擴(kuò)展延伸范圍隨地應(yīng)力差和煤堅(jiān)固性系數(shù)的變化規(guī)律；針對(duì)五陽煤礦地質(zhì)條件選擇現(xiàn)場(chǎng)工業(yè)試驗(yàn)地點(diǎn)，設(shè)計(jì)水力壓裂試驗(yàn)方案，根據(jù)裂縫起裂理論計(jì)算模型和數(shù)值模擬結(jié)果設(shè)計(jì)水力壓裂注水壓力、注水時(shí)間、封孔方式和深度等工藝參數(shù)。通過現(xiàn)場(chǎng)工業(yè)試驗(yàn)，驗(yàn)證方案設(shè)計(jì)，考察瓦斯抽采效果?，F(xiàn)場(chǎng)工業(yè)試驗(yàn)結(jié)果表明，水力壓

3、裂卸壓增透后，煤層透氣性明顯增大，壓裂后瓦斯抽采濃度、流量顯著提高，水力壓裂卸壓增透技術(shù)適用于五陽煤礦高瓦斯低透氣性煤層，在總結(jié)理論分析、數(shù)值模擬和現(xiàn)場(chǎng)試驗(yàn)結(jié)果基礎(chǔ)上，得出適用于五陽煤礦水力壓裂的主要技術(shù)工藝參數(shù)。關(guān)鍵詞：水力壓裂；卸壓增透；數(shù)值模擬；地應(yīng)力差；瓦斯抽采研究類型：應(yīng)用研究萬方數(shù)據(jù)萬方數(shù)據(jù)Subject:ResearchandApplicationonPressureReliefandPermeabilityIncreasinginLowPermeabilityCoalSeambyHydraulicFracturinginWu

4、YangCoalMineSpecialty:SafetyTechnologyandEngineeringName:MaRuifeng(Signature)Instructor:LiShugang(Signature)XuMangui(Signature)ABSTRACTCoalseamsinChinahavelowpermeabilitygenerally.Becauseofthis,gasextractionisinefficientandsafetyproductionisaffectedseriously.Accordingtogas

5、extractionprobleminhighgassyandlowpermeabilitycoalseamofWuYangCoalMine,thehydraulicfracturingisproposed.Basedontheoreticalanalysis,experimentanalysisandnumericalsimulation,fractureinitiation,propagationmechanismandeffectsofpressurereliefandpermeabilityincreasingwereanalyze

6、d.Combinedwithfieldtest,theparametersweredetermined.ThisresearchwillprovidetheoreticalbasisandtechnicalsupportforgasextractioninlowpermeabilitycoalseamofWuYangCoalMine.Throughhydraulicfracturingtheoryanalyzing,theoreticalcalculationmodeloffracturingpressureandfracturelengt

7、hweregotandcombinedwithexperimentofpermeabilityincompletestress-strainprocess,theeffectofpressurereliefandpermeabilityincreasingwasalsostudied.UsingRFPAnumericalsimulationsoftware,behavioroffracturingpressureandpropagationextensionchangingwithgroundstressdeviationandconsis

8、tentcoefficientwereresearched.Inaddition,thefieldtestlocationswerechosebasedongeologicalc