分层合采油井产能分析

在生产中两层合采时的产量有时远低于两层分采的产量之和等有悖于人们的直观想象。研究层状油藏的不定常渗流特征有可能对某些工程问题作出切合实际的分析和解释,有助于选择合理的生产压差。给出了n层无穷延伸平面均质油藏层间元窜流、各层初始压力或相等或不相等情形下油井井壁压力、各层层面流量的计算公式和计算方法。通过一个两层油藏的算例,采用Stehfest数值反演方法分别计算了油井定产和定压条件下储层层面流量的变化,给出了算例条件下各层初始压力不相等时"倒灌"量的变化曲线图。

PRODUCTIVITY ANALYSIS ON COMMINGLED PRODUCTION WELLS

When two layers are produced together or separately, the output is very different. which is beyond the imagination of people. Study to the random percolation characteristics of stratified reservoirs may help to make reasonable analysis and Interpretation to some engineering problems, help to select the rational producing pressure differential. This paper presents the calculation equation and method of the sidewall pressure and the plane flow of every layer, assuming that cross flow does not exist among the homogeneous reservoir with n-layer infinite extension planes, and the initial pressure of each layer is or is not the same. Taking a two--layer reservoir as an example, this paper uses the Stehfest Numerical Inversion Method to have calculated the plane flow under constant output and pressure respectively, presents the "backflow" variation curve when the initial pressure at each layer is different.