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随着水平井技术在油气田开发中运用得日益广泛,准确预测水平井产量变得至关重要。以水平井周围椭球体等压面为基础,将水平井的渗流划分为近井地带若干个椭圆形供给边界中一点汇的渗流问题以及远井地带的线性渗流问题,基于相似流动替换法以及等值渗流阻力法求得水平井产量计算的新公式。通过实例分析以及与Borisov等较为经典的产量公式计算结果相比较,新公式计算结果大,但与实际生产数据的相对误差最小,约为10.09%。分析表明,这是因为新公式推导过程中考虑内部渗流场为一个个椭圆形组成的椭球体,内阻较小,而Borisov等产量公式中将内部渗流场简化为拟圆形组成的圆柱体,内阻较大,使得计算结果与实际生产数据相对误差较大。因此新公式不仅能够准确预测水平井产量,而且符合水平井客观渗流模式。
As horizontal well technology becomes more widely used in oil and gas field development, accurate prediction of horizontal well production becomes crucial. Based on the ellipsoidal isobaric surface around the horizontal well, the seepage of horizontal wells is divided into the seepage problem of some oval sink boundary in the near wellbore and the problem of the linear seepage in the far well zone. Based on the similar flow replacement method and so on A new formula to calculate the output of horizontal well by the seepage resistance method. Through the example analysis and compared with the results of the more classic production formulas such as Borisov, the new formula has large calculation results, but the relative error with the actual production data is the smallest, about 10.09%. The analysis shows that this is because the elliptic spheroid with an internal ooze field is considered in the derivation of the new formula, and the internal resistance is small. However, the internal seepage field in Borisov’s production formula is simplified to a cylinder with a quasi-circular shape, Large internal resistance, making the calculation results and the actual production data relatively large error. Therefore, the new formula not only can accurately predict horizontal well production, but also meets the objective model of horizontal well seepage.