基于洛伦兹曲线模型评价精细分层注水效果  

Application of Lorenz-curve model to stratified water injection evaluation

作　　者：高大鹏[1,2] 叶继根[2] 胡云鹏[2] 董毅夫 朱振坤 袁贺[2] 黄磊[2] 王书义 

机构地区：[1]北京大学地球与空间科学学院 [2]中国石油勘探开发研究院 [3]中海石油(中国)有限公司深圳分公司研究院 [4]大庆采油工程研究院 [5]中国石油吉林油田扶余采油厂

出　　处：《石油勘探与开发》2015年第6期787-793,共7页Petroleum Exploration and Development

基　　金：国家科技重大专项(2011ZX05010-002)

摘　　要：为了定量评价不同时间精细分层注水油藏的吸水效果,基于改进的四参数Sarabia洛仑兹曲线模型,结合多年次单井吸水剖面测试数据,建立了描述单井累计射开砂岩厚度与累计吸水量之间关系的洛仑兹曲线模型。提出了无因次注水强度、油层动用程度和吸水非均衡程度3个评价指标及其计算方法,分别用于定量评价各油层的注水强度、有效动用的油层厚度所占比例以及整体吸水均衡状况,采用粒子群智能优化算法对模型及各评价指标进行求解。结合大庆杏树岗油田杏六中区38口精细分层注水井开展吸水效果评价,最终综合考虑分段结构、配水方案和地层物性确定了影响单井注水效果的因素,提出了全区"双特高"开发阶段的细分层段政策界限。To evaluate the effect of stratified water injection accurately during different development stages, a Lorenz-curve model was constructed upon a modified four-parameter Sarabia-Lorenz-curve model with water injectivity test data over years, and the relationship between accumulative perforated sandstone thickness and injected water volume of single wells was described by the model. Three evaluation indexes, dimensionless water injectivity intensity, vertical sweep efficiency and water-injection non-balanced degree, and their calculation were presented. Dimensionless water injectivity intensity is used to evaluate the distribution and balanced degree of water injectivity intensity, vertical sweep efficiency is the proportion of oil layers that produce oil, and water-injection non-balanced degree illustrates the overall water-injection balanced condition, then the model is solved by particle swarm optimization algorithm. Thirty-eight stratified water injection wells were evaluated in the Daqing Xingshugang oilfield. And the factors influencing the effect of water injection in single wells were studied considering segments construction, water allocation projects and reservoir physical properties. Finally, technological limits of stratified water injection were proposed under extreme high water-cut and recovery.

关 键 词：精细分层注水 洛伦兹曲线 无因次注水强度 吸水非均衡程度 油层动用程度 细分层段政策界限 

分 类 号：TE357[石油与天然气工程—油气田开发工程]