注蒸汽开发后期稠油藏火驱高温燃烧特征

新疆稠油主体开发区已进入蒸汽开发后期,需要转换开发方式,进一步提高采收率。筛选A1油藏开展火驱开发技术评价研究。分析测试结果表明,试验区经历烟道气驱、产量上升2个阶段后,进入稳产阶段;产出气体中CO2体积分数稳定在13.0%以上,原油改质作用明显、物性"一升四降";同时,氧气利用率保持在93%以上,视氢碳原子比为1.37。注蒸汽开发后期稠油藏成功实现火驱高温燃烧。

Research on high temperature combustion properties in heavy oil reservoir in the late period of steam injection development

The main body of the Xinjiang heavy oil reservoir development zone has entered the late stage of steam injection development.Hence,it is essential to change development way in order to further enhance oil recovery.Then A1 reservoir is selected to carry out the evaluation and study of the fire drive technology.Analysis and test results show that after the experimental zone experienced the two stages of the flue gas drive and the yield rise,it entered a stable stage.The content of CO2 in the output gas keeps steadily more than 13%,and the modification effect of the crude oil is obvious and the physical property can be described as "one rising and four reducing".At the same time the oxygen utilization rate is higher than 93%,while the atomic ratio of hydrogen to carbon keeps 1.37.The success of fire drive in heavy oil reservoirs in the late stage of steam injection development is made in high temperature combustion.