注空气泡沫低温氧化工艺提高采收率试验

Experiment of improved oil recovery by air foam injection low temperature oxidation process

针对中原油田胡12块油藏非均质性严重及水驱效果差的现状，对原油一空气泡沫的氧化特性、封堵效果及其影响因素、驱油效果进行模拟试验研究。结果表明：胡12块原油具有较好的氧化活性，温度、压力、含水饱和度与黏土含量对氧化速率都有影响；空气泡沫的存在对原油静态氧化有一定影响，而对油藏条件下的动态氧化影响不大；气液比为1：1～2：1、温度越低、压力及岩心渗透率越高时，泡沫稳定性越好，封堵能力越强；空气泡沫驱阶段可提高驱油效率13％～24％，适用于非均质严重地层提高原油采收率。

Aimed to the poor performance of waterflood due to serious heterogeneity of block Hu 12 in Zhongyuan Oilfield, the simulation experiments of oxidation characteristics, shut-off capability and its influence factors, and oil displacement efficiency were conducted. The results show that the oil of block Hu 12 has good oxidation activity, and the temperature, pressure, water saturation and clay content have effect on oxidation rate. Air foam can reduce oxidation rate at static conditions, but this effect is not significant at dynamic （flooding） conditions. The ratio of air and foaming liquid with a range from 1：1 to 2：1 has much effect on the stability and shut-off capability of air foam. And the stability and shut-off capability of air foam increase with the temperature decreasing, pressure and permeability increasing. Air foam injection can increase oil recovery efficiency by 13%- 24% after water flooding in the experiment of sand-pack displacement. This technology could effectively improve oil recovery efficiency of heterogeneous reservoir.