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1、摘要分支井是指在一口主井眼(直井、定向井、水平井)中钻出若干进入油(气)藏的分支井眼。分支井在海上油田和陆上油田在垂直方向上有多个产层,薄油藏及稠油油藏等方面应用越来越普遍。由于分支井一般都是三维井身剖面,并且分支井的起点位置位于主井筒上,其设计方法不同于普通定向井和水平井,有必要研究新的轨迹设计模型和设计方法。分支井筒的设计需要确定分叉口处的坐标和井斜方位的井身参数,本文推导了用于井眼轨迹上任意一点确定井身参数的插值方法。分支井轨迹设计中涉及到主井筒和分支井筒的设计,本文在分析总结现有的各种定向井设计方法的
2、基础上,对三维分支井轨迹设计做了详细的研究,并应用空间斜平面上的圆弧轨道设计方法,进行了详细的模型分析和理论推导,最终得出了一套实用的三维分支井的设计理论和方法。在理论设计的基础上,运用VB编程语言编制了分支井轨迹设计软件。运用此方法和编制的软件用油田实例参数进行了验算,得到该井主井筒和一组分支井筒的轨迹分段数据,并对结果进行了离散,运用Excel作图得到了三维轨迹的垂直剖面图和水平投影图,由此验证了该方法的可靠性。关键词:分支井;轨迹设计;最小曲率法;斜平面法1AbstractMultilateralWel
3、lsisakindofwellsthataredrilledseveralbranchesintothereservoirsfromthemainboreholewhichreferstoverticalwells,directionalwells,horizontalwellsandetc.MultilateralWellsarewidelyusedintheoffshoreoilfieldsandonshorefieldstodevelopparticularreservoirssuchastherese
4、rvoirwithseverallayersintheverticaldirection,thinandheavyoilreservoirs.Sincethewellprofilesaregenerally3Dandthekoplocatesinthemainborehole,thewellprofileplanprocessisdifferentfromtheordinarydirectionalwellsandhorizontalwells,itisnecessarytostudythenewtrajec
5、toryplanningmodelandmethods.Thewellplanofbranchesneedstodeterminethecoordinates,inclinationandazimuthofthetie-onpointfirstly.Inthispaper,theinterpolationmethodfordeterminingthetrajectoryparameterswasdeveloped.Welltrajectoryplaninvolvedtothedesignofthemainbo
6、reholeandthebranches.Thispapersummarizedthevariousexistingdirectionalwellsdesignmethodsbasedonthe3Dtrajectorydesign,adetailedstudyandapplicationofspaceobliqueplanecircularorbitdesignmethodforadetailedanalysisandtheoreticalmodelderived,finallyapractical3Dmul
7、tilateralwelldesigntheoryandmethodweregained.Onthebasisoftheoryofwellplan,multilateralwelltrajectoryplansoftwarewasdevelopedusingVBprogramminglanguage.Usingthismethod,andsoftware,amultilateralwellformoilfieldwereplaned,trajectoryofthemainboreholeandabranche
8、swerecalculatedanddiscretionofwellpathwerecarriedout.Finally,amultilateralwellpathwasprojectedonverticalplanandhorizontalplan.Keywords:Multilateralwell,Wellpathplan,MinimumCurvatureMethod,InclinedPlane