北三区注水井吸水能力变化规律研究  

The study on change law of water injectivity of injection well in west of Bei three district

作　　者：李福军[1] 沈延伟 卢二付 蔡文芳[1] 

机构地区：[1]中国石油长庆油田分公司第五采油厂,陕西西安710018

出　　处：《石油化工应用》2014年第11期1-6,15,共7页Petrochemical Industry Application

基　　金：国家科技重大专项"高含水油田提高采收率新技术-剩余油分布综合预测与精细注采结构调整技术";项目编号:2011ZX05010-002

摘　　要：北三区西部自1974年以来经历了30多年注水开发,目前已进入高含水开采阶段,地下油水分布更趋复杂,注水井吸水能力变化和注水效率也呈现不同的特征。本文从油藏开发动态资料入手,结合该区注水井动态资料和注入剖面资料,从注水量、吸水剖面变化特征和吸水指数等方面着手,对注水井的吸水能力变化类型和产生原因进行归纳分析。剖析了该区注水井的吸水剖面特征,包括小层吸水厚度和吸水强度对比、底部油层吸水强度、正韵律油层底部突进、上部剖面周期性特征和小层吸水量分布特征等方面,进一步了解注入水的纵向分布。并通过分析注水井的视吸水指数变化规律和区块视吸水指数与含水率的关系,得出了整个注采系统流体流动性质的变化以及油层吸水能力的变化趋势。Based on the analysis of this work area＇s geological characteristics, we understand the reservoir＇s situation and go further to know the structural feature, lithologic feature, sedimentary micro-facies feature and reservoir fluid nature of this reservoir. Combined with the injection well performance and injectivity profile, we begin with injection flow rate, changement of injectivity profile and injectivity index, different types are shown in the paper about the changement of water injectivity and the creator. In the light of injection flow rate, we divided all the injection wells into three types, up after the first, logarithm, smooth relief.Combined with the injectivity profile, we get a further study about the injection well＇s injectivity profile feature, which including the comparison between water intake rate and water injectivity in the sublayer, water intake rate in the bottom layer, positive rhythm oil layer, upper part＇s cyclical variation and water out behavior, and we go further to know longitudinal distribution of flood water, making monitor and analyse. By means of summing up about the changement of apparent water injectivity index, and the relationship between apparent water injectivity index and water cut, we get the alternation about fluid property in the water flooding regime and water injectivity in the reservoir.

关 键 词：注水井 吸水能力 吸水剖面 视吸水指数 

分 类 号：TE357.6[石油与天然气工程—油气田开发工程]