考虑启动压力梯度时普通稠油非线性渗流模型解析求解方法

摘要

建立了油井定产及定井底流压条件下考虑启动压力梯度时单相不稳定渗流模型和油水两相二维不稳定渗流模型,并结合物质平衡原理及动边界理论建立了非线性渗流模型解析求解方法;选取渤海A油田实际地质及流体参数进行实例计算,结果显示启动压力梯度在很大程度上影响了油井有效压力的传播半径和传播速度,以及近井周围的压降,因此在油井实际生产过程中,需要根据实际地质流体特性合理设计生产压差,尽可能克服近井地带综合压力损失,以保证油井连续生产.%Under the conditions of constant well production and well bottom pressure, unstable seepage models with a single phase and two phases of oil and water are established when the threshold pressure gradient is considered. Furthermore, in combination with the theories of mass balance and dynamic boundary, an analytic solution method is presented for nonlinear seepage models. A practical calculation has been done by using the geological and fluid parameters from A oilfield in Bohai sea, and the results have indicated that the threshold pressure gradient has an impact to a great extent on the propagation radius and velocity of effective well pressure and the pressure drop around a well. Therefore, it is necessary to design a reasonable pressure drop during well production, in order to overcome overall pressure loss around a well and to ensure continuous production.