胜利油田不同类型油藏聚合物驱生产动态的定量表征

建立了生产动态定量表征模型,其中包括初始时刻累积注入量、峰值时刻累积注入量、结束时刻累积注入量以及峰值4个具有明确物理意义的特征参数.利用该模型定量表征了胜利油田不同类型油藏聚合物驱增油和含水变化趋势,同时,提出了利用基于实数编码的遗传算法自动求解该模型的方法.该模型数学形式简洁,便于确定特征参数,且具有较好的外推性,也可用于工程问题中类似增长曲线的拟合和预测.考虑到注聚合物前的物质基础、油藏静态参数及注采强度等因素,将胜利油田已实施的23个聚合物驱单元分为5种油藏类型,不同类型聚合物驱单元在生产动态上表现出不同的定量规律.

Quantitative characterization of polymer flooding production performance in different reservoirs of Shengli Oilfield

According to the variations of oil recovery and water cut in polymer flooding reservoirs, a mathematic model was established for quantitatively characterizing the polymer flooding production performance in different reservoirs. The model includes four characteristic parameters with specific physical meanings, namely the cumulative injection at the initial moment, cumulative injection at the peak value moment, cumulative injection at the finishing moment and the peak value. The corresponding automatic solution method for this model was proposed on the real-coded genetic algorithm. The mathematic model is concise and can be extrapolated. The parameters of the model are easy to be determined. The model has universal significance and can also be used in the matching and prediction of similar growth curves in engineering. Considering some factors such as material foundation, static parameters and injection production intensity, 23 polymer flooding units in Shengli Oilfield were divided into five types of reservoir. The different polymer flooding units exhibit the different quantitative rules in the production performance.