姬塬油田G83区长4+5储层欠注机理分析王小宁1，李昊玺2，严昌鹏1，薛鸿博1，李轩1，韩涛1（1.中国石油长庆油田分公司第九采油厂，宁夏银川750006；2.中国石油长庆油田分公司第一采气厂，陕西西安710018）摘要：姬塬油田G83区长4+5油藏欠注井逐年增多，且大多数欠注井多次治理无效，急需深入认识油藏储层的微观结构变化特征，研究注水井欠注机理，从而解决注水井欠注、注水压力高、欠注治理无效的问题。为此开展了储层特征研究、水驱实验、配伍性实验、注入水水质分析等。研究表明：注水不配伍、微粒运移、注入水水质不达标导致地层堵塞是欠注主要原因。关键词：姬塬油田；长4+5油藏；欠注；微观结构；变化特征中图分类号：TE357.8文献标识码：A文章编号：1673-5285（2023）03-0090-05DOI:10.3969/j.issn.1673-5285.2023.03.018Under-injectionmechanismanalysisofChang4+5reservoirinG83districtofJiyuanoilfieldWANGXiaoning1，LIHaoxi2，YANChangpeng1，XUEHongbo1，LIXuan1，HANTao1（1.OilProductionPlant9ofPetroChinaChangqingOilfieldCompany，YinchuanNingxia750006，China；2.GasProductionPlant1ofPetroChinaChangqingOilfieldCompany，Xi'anShaanxi710018，China）Abstract:Thenumberofunder-injectionwellsinChang4+5reservoirinG83districtofJiyuanoilfieldisincreasingyearbyyear,andmostoftheunder-injectionwellshavebeentreatedineffectivelyformanytimes.Itisurgenttodeeplyunderstandthemicrostructurechangecharacteristicsofthereservoirandstudythemechanismofunder-injectionofwaterinjectionwells,soastosolvetheproblemsofunder-injectionofwaterinjectionwells,highwaterinjectionpressureandineffectiveunder-injectiontreatment.Forthisreason,reservoircharacteristicsresearch,waterdriveexperiment,compatibilityexperimentandinjectionwaterqualityanalysishavebeencarriedout.Thestudyshowsthatthemainreasonsforunder-in－jectionareincompatibilityofwaterinjection,migrationofparticlesandformationpluggingcausedbysubstandardinjectedwaterquality.Keywords：Jiyuanoilfield；Chang4+5reservoir；under-injection；microstructure；changechar－acteristics*收稿日期：2023－02-01作者简介：王小宁（1983-），男，助理工程师，本科，从事油气田开发工作，邮箱：550592373@qq.com。石油化工应用PETROCHEMICAL...
