常数因子法确定油井标准指数递减方程

Constant factor method to determine the well standard exponential decrease equation

指数递减方法是油气井(藏)处于产量递减期预测的一个重要方法。它可以用于预测递减阶段的产量、累积产量和可采储量[1]。文中对红河油田处于递减期的生产井加以分析,提出一种新的确定标准指数方程的方法-常数因子法。常数因子法是指在同一区域,通过现已处于递减期的n口生产井,对现有的生产数据进行分析,拟合出各单井的指数递减规律方程,然后应用统计学方法计算出常数因子c,再利用最小二乘法原理可得到初始递减率D,从而可确定该区域内处于递减期生产井的标准指数递减方程,特别是对于递减初期的生产井可以用其少量生产数据确定其递减方程。

The exponential decline model is an important method to forecast the output of oil and gas well（reservoir）in production decline period. It can be used to predict the production,cumulative production and recoverable reserves[1]. According to actual production data and theoretical calculations of gas production, this paper presents a constant factor method, which is a new method to determine exponential equation, based on analysis of the production wells in the period of depletion, Honghe oilfield. This method can provide the exponential decline equation of every single well through anglicizing the production data of production wells which have been in production decline period in the same area. And then the general decline formula of this area can be available, based on the constant factor c, which is obtained by statistical method. Finally, we can get the initial decline rate D of wells per least squares methods, which can determine the exponential decline equation of the production wells in production in the area. Especially, for the production wells in initial decline period, it can come to perfect effect in spite of using a small amount of production data.