利用CO2改善韦5稠油油藏开采效果

针对江苏油田韦5中低渗复杂小断块薄层稠油油藏进行CO2开采方式研究，为同类型稠油油藏利用CO2开采提供有益的借鉴。用数值模拟方法研究了CO2吞吐的敏感因素，结果认为，周期注气量、注气速度和生产过程的井底流压是影响吞吐效果的重要因素，浸泡时间对效果影响不大。以增产油量和换油率作为评价依据的计算结果表明，在大注气量、高注气速度和合理控制的生产井底流压下存在最优吞吐轮次，可以得到较好的CO2吞吐效果。

Improvement of Recovery Performance of Wei-5 Heavy Oil Reservoir by CO2 Stimulation Process

Study of using CO2 stimulation process in Wei-5thin-layer heavy oil reservoir with medium-low permeability and complicated small fault block is conducted.By numerical simulation technique,sensitivity factors of CO 2 stimulation are analyzed.The result shows that the major factors affecting CO 2 stimulation performance include cyclic CO 2 injection volume,CO 2 injection rate and bottom hole pressure,while the soaked period has restricted effect.Based on increased oil production and improved oil production per unit volume of CO 2 in jection as evaluated basis,the calculated result indicates that under high CO 2 injection volume,high CO 2 injection rate and reasonably controlled bottom hole pressure,optimal cyclic numbers can be determined and better CO 2 stimulation performance can be obtained.This study can be as a guide for development of those similar to this type of heavy oil reservoir.