Spontaneous imbibition is an important mechanism of oil recovery from fractured reservoirs and unconventional reservoirs. Oil is produced by combining co- and counter-current imbibition when the matrix blocks was partially covered by water. In this paper, we focused on the effect of viscosity ratios on oil production by spontaneous imbibition and established the numerical model for one-dimensional linear imbibition with TEO-OW boundary conditions, which was validated by the experimental data. The effect of viscosity ratio on co- and counter-current imbibition is investigated and scaling result of the imbibition recovery curve for wide range of viscosity ratio using the conventional scaling equation was tested, which indicates that the close correlation was achieved only when oil-water viscosity ratios are higher. Then, a modified scaling equation was developed based on the piston-like assumption for one-dimensional co-current imbibition and close correlation of imbibition recovery curves was achieved when viscosity ratios are lower. Finally, correlation of imbibition recovery curves was improved for wide range of viscosity ratios by combining conventional and modified scaling equation. Results show that since the shape of imbibition recovery curves is not similar for different viscosity ratios, it is difficult to obtain the perfect correlation using the constant viscosity term.

自吸是从裂缝性油藏和非常规油藏中采油的重要机理。当基质块部分被水覆盖时，通过并流和逆流吸收相结合来生产石油。本文重点研究了粘度比对自发吸油的影响，建立了具有TEO-OW边界条件的一维线性吸油的数值模型，并通过实验数据进行了验证。研究了黏度比对并流和逆流吸收的影响，并使用常规比例方程对宽黏度比范围下的吸收恢复曲线的缩放结果进行了定标，结果表明只有在油水条件下才能实现紧密相关。粘度比更高。然后，基于活塞状假设，针对一维并流吸收，开发了一个改进的比例方程，当粘度比较低时，吸收吸收恢复曲线紧密相关。最后，通过结合常规比例尺和改进比例尺方程，可在较宽的粘度比范围内改善吸收恢复曲线的相关性。结果表明，由于不同粘度比的吸水恢复曲线的形状不相似，因此使用恒定粘度项很难获得完美的相关性。通过组合常规比例尺和改进比例尺方程，可在较宽的粘度比范围内改善吸收恢复曲线的相关性。结果表明，由于不同粘度比的吸水恢复曲线的形状不相似，因此使用恒定粘度项很难获得完美的相关性。通过组合常规比例尺和改进比例尺方程，可在较宽的粘度比范围内改善吸收恢复曲线的相关性。结果表明，由于不同粘度比的吸水恢复曲线的形状不相似，因此使用恒定粘度项很难获得完美的相关性。