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Blasingame产量递减分析方法,可用于分析变井底压力和变产量条件下的产量递减问题,但Blasingame方法并没有考虑储层应力敏感的影响。本文基于低渗透应力敏感储层渗流特征,建立考虑储层应力敏感影响的定产生产模型,并采用不等距差分的数值方法进行求解,并在计算过程中将定产生产条件转化为内边界条件、显示处理应力敏感对储层渗透率的影响;基于Blasingame方法的无因次变化量,制作应力敏感储层的产量递减曲线图版,并分析了不同条件下的产量变化规律。研究表明,考虑应力敏感的改进Blasingame产量递减曲线,在边界控制流阶段曲线的形态变化互相平行,而随着无因次距离的增加,曲线向下移动;随着应力敏感系数的增加,改进Blasingame产量递减曲线向下移动。实际应用表明,应用改进的Blasingame分析方法,解释结果更符合低渗透、应力敏感储层的开发实际状况。
The Blasingame method of production decline analysis can be used to analyze the problem of decreasing production under variable bottom hole pressure and variable production conditions. However, the Blasingame method does not consider the influence of reservoir stress sensitivity. Based on the seepage characteristics of low-permeability and stress-sensitive reservoirs, this paper establishes a fixed-production model that takes into account the sensitivity of reservoir stress and uses the numerical method of non-equidistance to solve the problem. In the process of calculation, the production conditions of fixed-production are transformed into the inner boundary Conditions, showing the impact of processing stress sensitivity on reservoir permeability. Based on the non-dimensional variation of Blasingame method, a yield-decreasing curve plate of stress-sensitive reservoirs was made and the variation of yield under different conditions was analyzed. The results show that considering the stress-sensitive improvement of the Blasingame yield-decreasing curve, the morphological changes of the curves at the boundary control flow are parallel to each other, and the curve moves downwards as the dimensionless distance increases. With the increase of the stress sensitivity coefficient, the Blasingame Production decline curve downward. Practical application shows that the application of improved Blasingame analysis method to explain the results more in line with the low permeability, stress-sensitive reservoir development of the actual situation.