岔河集油田是华北油田两大类型之一的砂岩油田,二十年来围绕如何进行产量接替 保持油田稳产,做了大量的工作,但随着油田开发的深入,油田开发进入中后期,油田 乘日余油分布变得极为分散、复杂,规律难寻。目前油田表现出含水上升速度加快,产量 递减加速,常规措施效果明显变差。对于这样的开发区,如何挖掘其剩余潜力己经成为 一个难题。 为扭转这种局面,必须打破思维定式,探索产能挖潜的新途径。由岔河集不稳定的 河流相沉积特征所决定,砂体小,连通性差,虽然一次井网加密已结束,但目前井距下 油砂体控制程度低,油层连通率及水驱效率也很低,因此为寻找油田今后的稳产及减缓 自然递减的出路,提出了在岔15一141井区开展井网二次加密试验,并分析该油田一定范 围内实施井网二次加密的可行性,指出潜力区块。如果有所突破,这将是产能建设的新 领域,意义重大。 本项目对15一141井区二次井网加密可行性进行论证,主要包括储量核实、油层特征 分析、主力砂体水驱现状分析、井网对砂体的控制程度分析、井网对油层连通状况的影 响、井网对水驱状况的影响、油藏合理井网研究等内容,并提出一套可行性布井方案, 实施后对试验结果进行逐一评价,主要包括加密后油层变化特征、油砂体变化特征、油 层水驱效率及水淹状况分析、储层物性分析、剩余油潜力分析、开发特征评价、最终采 收率预测、经济效益评价等。评价结果表明加密效果较好,达到了预期目的,依据试验 结果,对岔河集油田南部断块井网二次加密潜力进行了分析评价,提出了下一步二次加 密的四个潜力区块。 主题词:复杂低渗砂岩油藏二次加密效果潜力区TheResearchintheFeasibilityofWellre一infillinChaHeJiOilfield Abstract ChaHeji011FieldbelongstooneofthetwomajortyPesofsandstoneoilfieldsinHuaBei 011field.ManymeasureshavebeentakenontheeenterofhowtostabilizetheProduetion duringthePast20yearsofdeveloPment.However,withthede叩eningofthe011field,s develoPing,the011fieldhasenteredthemiddle一latedeveloPmentstage.Thedistributionofthe remaining011hasbecomeseatteredandeomPlexanddiffieulttofinditsrule.The011field statusindieatesthatthewatereut15quickeninguP,theyieldsdeeline15sPeedinguPandthe ProduetionresPonsesofordinarymeasuresWeakensobviously.Howtotaptheremaining PotentialhasbeeomeaPuszlingProblem.Inordertotumthissituation,fixedthinkingmode mustbebrokenthroughtotrynewwaystotaptheremainingPotential.Fatedbythefluvial dePositionofChaHeji011field,althoughthewellinfillhasbeenfinished,thedegreeof reservoireommunieationandthedegreeofwaterfloodingarelower.Thus,inoulertoseekthe waystostabilizetheyieldsandtolowerthenaturaldeeline,wedidanexPerimentofwell re一infillintheareaofwellCha15一141,then,weanalyzedthefeasibilityofwellre一infillin someotherareasoftheoilfieldandPointedthePotentialbloeks.IftheexPerimenteouldbring somebreakingthrough,itwouldbeanewfieldforthebuildingofoilfieldPotentialandof imPortantsignificanee. Westudythefeasibilityofwellre一infillinginCha15一141wellssubarea.Maineontents eonsistofreservecheeking、eharaeteranalyzingonPayzones、Waterfloodingstatusquo analyzingaboutmainsandbodies、ControllingdegreeofwellPatterntothesandbodies、well sPaee’5influeneeon011layer’5eormeetedstatus、InflueneeofthewellssPaeingtowater drivingstatus、AstudyaboutreasonablewellsPaeeofthereservoirete,andgiveafeasibility ProjectofwellssPaeing. AftertheProjeet,5actualizing,weevaluatetheeffeets.Maineontentsconsistofcharaeter of011layers submerging varying、varycharaeterof011sandstonebodies、waterdrivingratioandwater statusofoillayersanalyzing、charaeterofoilreservesanalyzing、residualPotential analyzing、exPloitingeharactersevaluating、foreeastingoffinallyreeoveryratio、eC0nOllllC 多benefitevaluatingand50on.TheresultsindexthattheeffeetofseeondwellsPacedeereasing 15PreferablegivingPotentialareastoeontinueean了outwellre一infillinginChaHeji011field. 争石了目录 摘要................”...............”..…”....................................................”.…”............1 ABSTRACT.......................................”…”..........””.........“...............”....2 1.引言..................................................................................….“.…”.…“.............1 1 . 1立论依据及研究的目的与意义.................................................................................2 1.2国内外研究现状.........................................................................................................2 1.3研究的目标及技术路线.............................................................................................3 1 . 4本文所完成的工作............,..................................................................................3 2.井网二次加密可行性论证..….”.”…””二””….…”一”””…“”“…”4 2.1储量核实......................................................................................................................4 2.2油层特征分析.,.............................................................4 2.3主力砂体水驱现状分析...........................................4 2.4井网对砂体的控制程度.............................................................................................5 2 . 5井网对油层连通状况的影响................,....................,...................................6 2 . 6井网对水驱状况的影响.............................................................................................7 2.7油藏合理井网研究.......................................................8 2.8井网二次加密开发指标评价..........................................................................,..11 3.实施效果评价.................................................”.....................................“....”..…21 3 . 1原井网对构造格局已基本控制................................................................................21 3.2油层变化特征..........................................,.................4一21 3 . 3油砂体变化特征......,......,............................22 3 . 4油层水驱效率及水淹状况分析........................................................................,..…23 3 . 5储层物性分析.............................................,.....................................................,.24 3 . 6剩余油潜力分析............................................24 3.7开发特征评价.................,.................................,...........................................25 3 . 8最终采收率预测.................................................28 3 . 9经济效益评价....................................................,................................................304.井网二次加密潜力分析.“..””..“二…二““二““..““二”“““”“”””.“二“““.”.”””.”.”…”“二“…31 4.1井网二次加密的条件及原则...................................................................................31 4.2井网二次加密潜力区块特征及井位部署...............................................................31 结论.…二”.…”..””..…”.““”“”““““二…二”.“..…””.“.”.…””.”.“”.““”“.”””.““.…”.“二”..…”.…36 致谢.…”.“.”“二“.“二”.“二”“.…“”“二“”…””二““”“”””“”””…“”…““.“二“二””…””.”..…37