用于高耗水层带判别的干扰试井方法

An interference well test method for the identification of high-consumption water zone

黄迎松

HUANG Yingsong

中国石化胜利油田分公司勘探开发研究院

Research Institute of Exploration & Development, SINOPEC Shengli Oilfield Company, Dongying 257015, Shandong, China

为准确判别水驱油藏开发中后期储层中形成的高耗水层带，从储层的渗流特征出发将具有高耗水层带的储层视为双层油藏，根据渗流力学理论和叠加原理建立了储层在形成高耗水层带后的干扰试井数学模型，分析了高耗水层带对观察井压力响应的影响，并进行了敏感性分析。进而以实测值与预测值差的平方和最小为目标函数，基于最优化理论建立了高耗水层带定量表征的数学模型。利用遗传算法对该模型进行求解，可得到高耗水层带的渗透率和体积等参数，提出了利用干扰试井方法定量解释高耗水层带参数的步骤。将该方法在胜利油田进行了矿场应用，结果表明该方法准确有效，解释结果与井间示踪剂测试具有较好的一致性，且测试时间由几个月缩短为1~2周。该研究成果可对现场的高耗水层带判别和开发方案调整提供理论参考。

In order to accurately identify the high-consumption water zone which is formed in the reservoir in the middle and late development stages of water-drive oil reservoir, the reservoir with high-consumption water zone was treated as a double-layer oil reservoir from the point of reservoir percolation characteristics. According to the percolation mechanics theory and the superposition principle, a mathematical model for the interference well test after the formation of high-consumption water zone in the reservoir was established. In this model, the effect of high-consumption water zone on the pressure response of the observation well was analyzed, and sensitivity analysis was also carried out. Then, based on the optimization theory, a mathematical model for the quantitative characterization of high-consumption water zone was established by taking the minimum sum of squares of the difference between the measured value and the predicted value as the objective function. This model was solved by means of the genetic algorithm, and accordingly the parameters of high-consumption water zone were obtained, including permeability and volume. Finally, the steps for quantitatively interpreting the parameters of high-consumption water zone by means of the interference well test method were put forward. This method was applied on site in the Shengli Oilfield. It is indicated that this method is accurate and effective. The interpretation result is in better accordance with the interwell tracer test result, and the test period is shortened from several months to 1-2 weeks. The research results can provide the theoretical reference for the on-site identification of high-consumption water zone and the adjustment of development scheme.

10.13639/j.odpt.2019.06.012