随着对天然气能源需求量的不断增大,天然气产量逐年增加,气田采出水也在不断 的增多基于降低开采成本和环保的目的,通常将气田采出水回注本文通过对重庆气 矿现有回注井注水现状分析!回注效果以及回注水水质对储层渗流物性影响机理及回注 层注入能力研究,主要取得以下几个方面的认识:对重庆气矿池63井嘉二2储层岩芯进 行储层敏感性评价,结果表明池63井嘉二2储层为弱速敏!强水敏,此类储层不适宜选 作回注层;提出了气田水回注总的原则是:只要注得进,地面无出漏即可,主要控制注 入水悬浮物含量和石油类含量,尽可能简化气田水处理流程:回注井的筛选原则:一是 将生产枯竭井转回注井,要求生产枯竭井的采出程度高,有效空间大!渗透性好;二是 新钻回注井;回注层的筛选原则:埋藏较浅且封闭性好:有足够大的储集空间,具有较 高的渗透率和较好的吸水性能;上!下隔离层隔离性好,注入层位横向连通性好,在地 表无出漏;隔离层不会因受到高压破裂,导致注入水窜层:注入水与回注层岩石及地层 水有较好的配伍性;地层压力不高,有能量亏损;井口压力愈低愈好,最好是自吸注入; 注入井位置应尽可能靠近生产井,减少管输距离,节约成本通过上述分析研究建立起 了气田采出水回注的研究方法,建立起适合气田采出水回注的储层筛选原则,建立起回 注层注入能力的研究方法 本文的研究为气田水回注提供了一套研究思路与方法 关键词:重庆气矿气田水回注注入能力影响因素AbstraCt Withthedemandofnaturalgasinereasing,theProduetionhasbeenincreasingannually. 50moregasfieldwaterhasbeenreeovered.ForreducingtheeostandProteetingthe envirotnnCllt,usuallythegasfieldwaterhasbeenreinjeetedinioreservoirs. Basedontheanalysisofe二entsituationofreinjeetionwellsinChongqingGasField, reinjeetioneffeetandimPaetmeeh耐smonreservoirseePagePhysiealProPertycausedby reinjeetionwaterqualityandthestudyofreinjeetionabilityofreinjectionreserVoir,hereare themainunderstandings:MostgasreservoirsinChongqingGasDistrietbelongtolow PermeabilityorextremelylowPermeabilityearbonatereservoirs,othersbelongtosandroek reservoirsWhichareinJurassiesystemandXujiallegrouPinuPPerTriassie.Therefore, whenseleetingreinjeetionreservoir,it15imPortanttoPreventchoosingthoselow Permeabilityreservoirs.ThelaboratorystudyofeomPatibilitybetweenreinjeetionwater qualityandreservoirindieatesthattheeomPatibilityofreinjeetionwaterandformationwater 15pretty,od;A刀dtheresultofeoresensiti城tyevaluationorwellehi63,Jia112indieates thatthereservoir15weakveloeitysensitiveandstrongwatersensitive.ThosearenotProPer forbeingthereinjeetionreservoir.PresentingthefieldwaterreinjeetiongeneralPrineiPle:Ifit caninjeetwithoutanysurfaeeleakage.Andt州ngtosimPlifyfieldwatertreatingproeess mainly廿止ougheontrollingaqueoussusPensioncontentandPetroleumeontentinthe reinjeetionwater.PresentingreinjeetionwellseleetionPrineiPle:Usingexhaustedwellwith highreeoveryratio,enougheffeetivePorosityandsoundPermeabilityasreinjeetionwell,or drillinganewreinjeetionwell.PresentingreinjeetionreservoirseleetionPrinciPle:n别叮owed buriedwithgoodsealing:enoughaceumulationsPace,gnodPermeabilityandwater absorption:goodisolationbetweenloweranduPPersealeoats,goodhorizontal eornrnunieationininjeetionzones,nosurfacewaterleakage,sealeoatwillnotfractureto causeinjectionWater90tootherzonesunderhighPressure:goodeomPatibilityamong injeetionwater,reinjeetionreservoirroekandfomationwater,nothighformationPressure, energy1055,thelessPressurethebetteratwellhead,thebestself-absorptioninjection;t州ng besttoloeatetheinjeetionwellneartheProduetionwelltoredueePIPelinetransmission distaneeandeuttingdowneost.Establishingthestudymethodofreinjeetionabilityandstudy onthereinjeetionabilityimPaetfactors. ThisstudyPresentsasetofideaandmethodforProducedwaterreinjeetionstUdy. Keyword:ChongqingGasFieldGasFieldwaterReinjeetionReinjectionability ImPaetfaetor II目录 l绪论..............................................................1 1.1立论依据及研究的目的意义....................................1 1.2国内外研究现状..............................................1 1.2.1国内外回注水质预处理及水质指标研究现状..............,二2 1.2.2国内外回注工艺研究现状.................................5 1.3研究目标及技术路线..........................................6 1.3.1研究目标...............................................7 1.3.2技术路线...............................................7 1.3.3研究内容...............................7 1.4取得的主要成果..............................................7 2储层地质特征......................................................9 3回注水水质对储层渗流物性的影响机理研究..........................12 3.1气田产水现状...............................................12 3.2气田采出水的水质特点.......................................13 3.3回注水水质对储层渗流物性的影响因素分析.....................14 4回注水水质与储层配伍性的实验研究................................16 4.1回注水与地层水配伍性评价...................................16 4.1.1回注水与地层水不配伍可能引起的损害表现................16 4.1.2回注水与地层水配伍性评价方法..........................16 4.2回注水与地层岩石配伍性试验.................................16 4.2.1储层敏感性评价........................................16 4.2.2悬浮固体颗粒对储层的损害机理..........................21 4.3气田水回注水质指标探讨.....................................21 4.3.1现有回注井回注水质指标................................22 4.3.2回注井回注效果分析..................................,.23 4.3.3气田水回注水质指标探讨................................28 5适合气田采出水回注的回注井及储层筛选............................31 5.1回注井的筛选原则...........................................31 5.1.1生产枯竭井转回注井....................................31 I5.1.2新钻注水井............................................32 一5.2回注层的筛选方法6回注层注入能力研究., 互dl口从勺口q口6.1注入水在地层中的渗流理论.................. .1回注水在储层中的稳定渗流.., .2回注水在储层中的不稳定渗流, 6.2注水能力影响因素分析.......................................43 6.2.1注入水稳定流动影响因素分析............................43 6.2.2注入水不稳定流动影响因素分析..........................45 6.2.3吸水指数及其影响因素..................................47 6.3注入压力及其影响因素.......................................48 6.3.1注入压力..............................................48 6.3.2地层破裂压力的计算....................................50 6.4注水井吸水能力降低的原因分析...............................51 7结论与建议......................................#.#54 7.1结论.......................................................54 7.2建议.......................................................55