新型扇形井网体积压裂裂缝扩展规律及风险区划

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中图分类号：TE357 文献标志码：A

Abstract：Horizontalwellmulti-stagfracturingisoneofthekeytechnologiesfortheeficientdevelopmentofunconventional oiland gasreservoirs.However，somewell padsarelimited byfactorssuchasreservoirdistributionandenvironmentalpro tection，making itimpossible toarrangewellsconventionally.Anewfan-shapedwellnetworklayout modelwasproposedto maximizetheutilizationofreservesinthistypeofreservoir.Thisstudyderivesananalytical solutionfortheinduced stress distributionof multiplewelsandfractures inanew fan-shaped wellnetworkatanyangle.The indorhydraulicfracturing experimentsonthefan-shaped wellnetwork wereconductedto studythecrack propagationlawofadjacenthorizontal wels in thefan-shapedwellnetwork，verifythemodel'sacuracy，anddividetheriskzoneof thefan-shapedwellnetwork．Theresults indicatethatthechange inanglebetweenthehorizontalwellandtheminimumhorizontal principal stressafectsheinitiationand propagationofcracks.As theangle increases，，thefracture morphology becomes morecomplex.The measureddeflectionangleofthecrackisingoodagreementwiththetheoreticalcalculationofthemaindirection，andthisanalyticalsolutioncanpredictthedirectionofcrackpropagation.Duetothevariablewellspacingfeaturefromthetoetotherootofthefanshapedwell network，thenew cracksattherootofthehorizontalwellaresubjected togreaterstressshadows fromtheold cracksinadjacentwell.According tothefracturemorphology，thefanshapedwellnetworkisdividedintolow-riskareas （the deviation angle of the horizontal well is less than 45∘ ），medium-risk areas （the deviation angle of the horizontal well is （204号 55∘-65∘ ），and high-risk areas（the deviationangle of the horizontal wellis greater than 75∘ ）.

Keywords：fan-shaped well network；multi stage fracturing；fracture morphology；risk zonation

水平井多段压裂是非常规油气藏高效开发的关键技术之一，有效提高了单井产量和开发效果，保障非常规油气藏转变开发方式和高效开发[1-3]。（剩余13574字）