苏丹Palogue油田稠油CO2吞吐开发影响因素数值模拟分析

苏丹Palogue油田为高孔高渗常规稠油油藏，采用CO2吞吐方式开发。采用数值模拟的方法分析了影响CO2吞吐效果的各项因素。分析认为，周期注气量、注气速度、浸泡时间和生产过程中的井底流压及降压方式都是影响单井吞吐效果的重要因素。以增油量和换油率为评价依据，经计算发现，在大注气量、高注气速度和合理控制的生产井井底流压进行开发时，存在最佳吞吐周期，以最佳吞吐周期开发可以得到较好的CO2吞吐效果。本次研究工作也为同类型稠油油藏CO2吞吐开采提供了有益的借鉴。

Numerical simulation analysis of the influence factors on CO2 stimulation in Palogue Oilfield

Palogue oilfield in Sudan is a conventional heavy oil reservoir with high porosity and permeability and is developed by CO_2 stimulation. The influence factors on CO_2 stimulation are analyzed by numerical simulation. The study shows that cyclic steam injection rate, soaking time, flowing bottom hole pressure and blowdown mode are important factors influencing the effectiveness of single well steam stimulation. Based on oil increment and oil draining rate evaluation, it is found that there is an optimum cycle of steam stimulation when developing with high steam injection rate and rational flowing bottom hole pressure. The optimum cycle can bring better development response. This study provides a helpful reference to CO_2 stimulation in similar heavy oil reservoirs.