摘要
油田开发后期,由于地下无效水循环严重,导致含水率居高不下。为了降低含水率,常采用传统的生产动态方法优化水井配注量,但此方法忽略了注采井之间的对应关系。文中应用流线数值模拟技术,建立了BY-1油田生产状况下的可视化流动井网,提出了水井＂瞬时存水率＂的概念;以工区平均瞬时存水率为基准,增加瞬时存水率高于区块平均值水井的注水量,减少瞬时存水率低于区块平均值水井的注水量,形成了一套优化水井配注量的技术方法。对BY-1油田生产进行的数值模拟结果表明：优化注水量后,产油量递减速率明显变缓,模拟3 a累计增油1.1×10~4t,增产效果显著,在改善地下无效水循环的同时,达到了油田降水稳油的目的。
Serious invalid circulation of groundwater can lead to a higher water ratio and keeps the value high at the later period of oil exploitation. In order to decrease the water ratio, traditional production dynamic methods, which ignore the corresponding relationship between injection and production, were usually used to optimize the injection distribution of injection well. The streamline numerical stimulation was established in this paper to simulate the visualization flow pattern based on field performance of BY-1, and the concept of instantaneous water storage rate was put forward. As the benchmark in average instantaneous water storage, an optimization approach was formed by increasing average injection volume when dynamic instantaneous rate is greater than the average, however, and decreasing average injection volumes when dynamic instantaneous rate is less than the average. The numerical simulation results of BY-1 show a remarkable effect of oil recovery improving. With water injection volume optimization,the oil production declines obviously slow, which leads to an increased output of 1.1 ×10~4t within three years. Simultaneously, the improvement of the groundwater cycle efficiency reduces the water cut and stablizes the oil production.
出处
《断块油气田》
CAS
北大核心
2016年第6期753-757,762,共6页
Fault-Block Oil & Gas Field
基金
山东省青年基金项目"页岩储层孔隙结构特征及微观运移机制研究"(ZR2013EEQ031)
国家自然科学基金青年科学基金项目"页岩多矿物相孔隙结构特征及考虑润湿特性的CH4耦合传输机制研究"(51404291)
中央高校基础研究经费项目"陆架区天然气水合物矿藏中CO2封存与置换CH4协同开采机理研究"(14CX05024A)
关键词
流线模拟
瞬时存水率
注水井
配注量
分配系数
streamline simulation
instantaneous water storage rate
water injection well
quantity of injection allocation
allocation factor
作者简介
孙致学，男，1979年生，副教授，博士，2008年毕业于成都理工大学油气田开发工程专业，主要从事油藏描述和油藏工程研究工作。E—mail：szx1979@126．com。
