苏丹P 油田注水时机实验及数值模拟研究

针对大型高凝油藏地层能量变弱、含水上升快、产量递减迅速等问题，结合海外油田高产稳产及高凝固点、高含蜡和高地饱压差等特点，建立了实际地层高温高压物理模拟实验系统，采用不同渗透率的岩芯，模拟不同驱替压力对开发效果的影响，得出最佳注水时机是脱出气体尚未形成连续相之前。采用数值模拟技术优化转注时机和采油速度，提出在合理利用天然能量的前提下，地层压力下降到3.4 MPa 为最佳的注水时机，合理的采油速度是2.2%。注采井组试验结果表明：适时注水可较好地保持地层能量，提高产液量，改善开发效果。

Experimental Study and Numerical Simulation on P Oilfield in the Process of Water Injection

To solve the problems of the decrease of reservoir energy, the fast rise of water-cut and the rapid decrease of production in the huge high pour-point oil reservoir, according to the characteristics of high, stable yields, high pour-point, high wax content, and high pressure differential between static and saturation pressure overseas oilfields, a high temperature and high pressure physical simulation experimental system is established. We simulate the effect of different core flooding pressure on development performance under the in-situ situation, and the results show that the optimized water flooding timing is before dissolved gas form the connectivity face. Utilizing the numerical simulation technology under the condition of making full use of natural energy, when the reservoir pressure decreases to 3.4 MPa, the water flooding timing is the best, and the optimized production rate is 2.2%. The results of the pilot test show that the good water injection timing can maintain the reservoir energy, increase liquid production and improve development performance.