广义递减曲线标准图版的制作与应用

CONSTRUCTION OF THE GENERALIZED DECLINE TYPE CURVE AND ITS APPLICATION

本文改进了油田产量递减的计算方法,在双曲线递减规律的基础上,将递减指数n的变化范围扩展为从-∞到+∞,称为广义递减曲线,从而包括了双曲线递减、指数递减、调和递减、直线递减等递减类型。制作了广义递减曲线标准图版,并提出了图版法与非线性最小二乘法相结合的油田产量减递计算方法。

The method of calculation for production decline in an oil reservoir is improved in this paper. The range of decline exponent is extended from-∞ to +∞ on the basis of hyperbolic decline. This decline curve is called generalized decline curve, which includes hyperbolic decline, exponential decline, harmonic decline and straight line decline etc. Generalized decline type curve is constructed, and a method of estimating production decline is presented, which combines together graphical methods with non-linear least squares methods. A example is shown in this paper also.