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1、石油機械.-——46.-——CHINAPETROLEUMMACHINERY2014年第42卷第l0期..油氣田開發(fā)工程多裂縫煤巖儲層水力壓裂裂縫動態(tài)擴展研究楊尚諭。楊秀娟閏相禎許建國(1.中國石油大學(華東)油氣CAE技術研究中心2.中國石油大學(華東)儲運與建筑工程學院3.吉林油田采油工藝研究院)摘要:考慮多裂縫煤巖儲層裂縫發(fā)育特性,基于簡化的N.S方程和連續(xù)性方程建立了水力壓裂裂縫尖端動態(tài)擴展模型。采用坐標變換的方法簡化縫內流體連續(xù)性方程,計算得到多裂縫煤巖儲層任意時刻壓裂液的濾失速度。應用3D—CBMuhi—Fracture軟件,對山西某區(qū)
2、塊WS一10煤層氣井水力壓裂主裂縫及次生裂縫動態(tài)擴展過程進行研究。研究結果表明,當攜砂液注入次生裂縫時間超過5min后,壓裂液濾失速度出現(xiàn)波動,隨著裂縫尖端砂堵區(qū)滲透率增大,壓裂液濾失系數(shù)增大;當次生裂縫砂堵區(qū)滲透率較小時,裂縫尖端變得短而粗,攜砂液進入次生裂縫10min后.裂縫最大寬度增加了2.2倍;增大裂縫尖端砂堵區(qū)滲透率,裂縫長寬比變化均勻,裂縫截面形狀不會發(fā)生突變;當裂縫尖端砂堵區(qū)滲透率為0時,水力裂縫動態(tài)擴展體積誤差為5%25%。關鍵詞:水力壓裂;動態(tài)擴展;裂縫尖端;砂堵;多裂縫;煤巖儲層;滲透率;濾失速度中圖分類號:TE371文獻標識
3、碼:Adoi:10.3969/j.issn.1001—4578.2014.10.012DynamicPropagationofInducedHydraulicFractureinFracturedCoalReservoirYangShangyu’YangXiujuan,YanXiangzhen’XuJianguo(1.OilandGasCAETechnologyResearchCenter,ChinaUniversityofPetroleum,Qingdao;2.CollegeofPipelineandCivilEngi—neering,Chin
4、aUniversityofPetroleum,Qingdao;3.ResearchInstituteofOilProductionTechnology,JilinOilfield)Abstract:BasedonsimplifiedN—Sequationandcontinuityequationandconsiderationofdevelopmentcharac—teristicsoffractureinfracturedcoalreservoir,dynamicpropagationmodelofhydraulicfracturingcrac
5、ktipwasbuilt.Usingthecontinuityequationofflowinthefracturesimplifiedbycoordinatetransformationandgiventheini.ticlconditionsandboundaryconditions,filtrationrateoffracturingfluidinfracturedcoalreservoiratanvtimecouldbecalculated.3D—CBMuhi—Fracturesoftwareisusedtostudythedynamic
6、propagationofthemainandsecondaryin—ducedhydraulicfractureinCBMwellWS一10inShanxi.Theresultsshowedthatfiltrationrateoffracturingfluidwouldfluctuateafter5minthefracturingslurrywasinjectedintofracture.Asthepermeabilityofsandplugzoneofcracktipincreases,thefracturingfluidfiltration
7、coeficientincreases.Ashortandthickcracktipwillbecreatedwithasmallpermeabilityofsandplugzoneofcracktip.Themaximumwidthofthecrackincreases2.2timesafterthefractureslurrywasinjected10min.Asthepermeabilityofsandplugzoneofcracktipincreases,thelength—widthratioofthefracturepresentsa
8、nevendistributionandresultsinanunchangedcrosssectionshapeoffrac—ture