存水率新方法评价注水开发效果研究
2015-10-21张文刘赛王熹李占东张海翔
张文 刘赛 王熹 李占东 张海翔



摘 要:从存水率的定义出发,给出计算存水率的两种计算方法。首先,根据丙型水驱规律曲线,推导出存水率的计算方法,绘制出存水率理论图版,由实际存水率值与理论图版关系评价注水利用情况;其次,通过物质平衡、注水和水侵关系计算得到驱动指数,将驱动指数法计算存水率值应用到油田实际生产中,分析开发效果,两种驱动指数法计算的存水率,排除了边底水的干扰,能正确表征注水利用率状况。
关 键 词:牛心坨油田;存水率;驱动指数;水驱规律曲线
中图分类号:TE 357 文献标识码: A 文章编号: 1671-0460(2015)07-1687-03
New Water Storage Rate Calculating
Methods for Evaluating Waterflooding Effect
ZHANG Wen1,LIU Sai1,WANG Xi1,LI Zhan-dong1, 2,ZHANG Hai-xiang1, 2
(1. Northeast Petroleum University, Heilongjiang Daqing 163318, China;
2. EOR Key Laboratory of Ministry of Education, Northeast Petroleum University, Heilongjiang Daqing 163318, China)
Abstract: Starting from the definition of water storage rate, two methods to calculate the water storage rate were put forward. First, according to type C water-drive curve, the storage rate calculation method was deduced, and water storage rate theory plate was drawn, water utilization capability was evaluated by the relationship between actual storage rate value and the theoretical chart. Secondly, the water driven index was calculated by the relationship among material balance, water injection and water invasion. The water storage rate values calculated by water drive index were used in actual oilfield production, and then the development effectiveness was analyzed. These two water storage rate calculation methods can exclude the interference of edge and bottom water to properly characterize water utilization condition.
Key words: Niuxintuo oilfield; Water storage rate; Drive index; Water flooding rule curve
累積存水率是指地下存水量(累注水减去累产水)与累积注水量之比。在矿场实际生产过程中,需要对注水开发效果进行评价,来反映油田注水能量利用情况。而存水率可作为综合评价注水效果的重要指标。存水率值与多种因素有关,包括注水量、产水量、注采比、油田压力保持状况、含水率的高低以及岩石及流体的压缩系数等参数值[1]。传统存水率计算方法不适合于有边底水侵入的油田,这是因为:当储层不封闭时(断层渗透性好或者有裂缝),造成注入地下油藏中的水外溢,当油藏有露头或者底水锥进时,产生驱动效应的不全为注入水,当油藏射开层位为水层时,就会有层间水产出,造成计算存水率值增大或减小,表现出注入水利用率升高或降低的假象[2]。本文提出两种驱动指数法来计算存水率,排除了边底水的干扰,能正确表征注水利用率状况。……
