利用系统分析方法评价注水开发油田的水驱效果

An Application of System Analysis Method to Evaluate the Water Drive Effect in Low Permeable Reservoir

根据油田开发动态系统分析方法，结合安塞油田注水开发实际，将油藏作为一个整体，利用油井的生产特征参数（产油量、产水量、含水率等）和注入井的注入量、注入压力等参数，建立描述油藏系统注入与产出关系的数学模型。通过评判利用模型计算的每口生产井的驱油、驱水相关系数的信息，刻画整个油藏系统注入与产出关系，从而对全区块进行水驱效果的评价。通过对安塞特低渗油田王窑区开发区块的试算，结果与实际较吻合，揭示出该区块北部长期产量较低，水驱能力低，应从加大其注水量、改变水线方向出发，使注入水能沿其砂体分布的方向自北而南，达到增强水驱能力、提高产量的目的。

This paper proposes a new method on evaluating the water drive effect in the injection oil field. It utilizes the principle and method of system theory, character parameters of oil well (oil production, water production,water content), injection rate and injection pressure of water injection well to set up a mathematics model for describing relationship between injection and production. Based on the water-drive, oiLdrive parameters obtained through the model of each production well, we can draw the contour map, and then evaluate the effectiveness of water drive of each well as well as the all area of oilfield. This paper gives an example, the calculated result is very similar to real date. It reveals the reason why the north area of Wangyao in Ansai Oilfield is an area with low production and low capacity of water drive. In order to improve this situation, reinforcing the water injection rate and changing the direction of water are very imporatnt.