用特征点计算拟合压力

USING PRESSURE STABLE POINT CALCULATING FITTING PRESSURE

在水力压裂压力递减曲线分析中 ,对二维裂缝模型分析问题的关键是拟合压力的确定 ,因为拟合压力的准确程度将直接影响压裂液滤失系数、裂缝几何尺寸等参数的可靠性。而目前采用的曲线拟合法、直角坐标法、双对数坐标法等确定拟合压力的方法均存在一定的局限性 ,误差较大。文中提出用中后期压力稳定点为特征点计算拟合压力的方法 ,具有准确、方便、快捷的优点。并进行了实例计算验证。

On the basis of analysis of pressure decline curve in hydraulic fracturing, the key of 2-D fracture model analysis is the determination of fitting pressure. Accurate degree of fitting pressure will directly affect filtration coefficient of fracturing fluid and reliability of fracture size parameter. At present, the methods of determining fitting pressure have certainly limitation by using curve fitting method, rectangular coordinate method and log-log coordinate method etc.. In this paper, the method of calculating fitting pressure using pressure stable point is proposed. Through example checking calculation, the result shows the calculation method is accurate, convenient and clipping .