利用动态资料计算稠油油藏启动压力梯度

Calculating threshold pressure gradient of heavy oil reservoir with the dynamic data

针对实验法、试井法计算稠油启动压力梯度存在误差大、耗时耗力的问题,提出了确定稠油启动压力梯度的动态法,即基于广义达西定律,利用油井产量与生产压差等数据,建立了求取稠油启动压力梯度的数学模型;通过定义目标函数将模型求解转化为最小值求取问题,并利用遗传算法进行了求解。渤海A油田实例验证结果表明,本文方法计算结果更能反映油田实际。利用本文方法建立了渤海典型稠油油田启动压力梯度与地下原油黏度关系式,为该类油田开发中井网、井距优化提供了依据,对于改善渤海油田稠油开发效果具有重要意义。

Calculating the threshold pressure gradient of heavy oil with experiment and well test methods has the problems of large error and time-consuming.In this paper,a method with dynamic data to calculate threshold pressure gradient of heavy oil is put forward based on the generalized Darcy's law.With oil well production and production pressure,a mathematical model calculating threshold pressure gradient of heavy oil is derived.By defining the objective function,the model is transformed to a minimum value calculating problem which is solved with genetic algorithm.The application example of A oilfield in Bohai sea shows that the method results reflect the field actuality.The relationship established with the proposed method between threshold pressure gradient and oil viscosity of the typical heavy oil oilfield in Bohai sea can provide a reference for the optimization of well pattern and well spacing in this kind of oilfield and has a significance for improving heavy oil development.