李坤全,黎平,魏敏章,等. 2021. 长庆油田黄3区长8特低渗油藏二氧化碳驱油与埋存先导试验[J]. 工程地质学报,29(5):1488-1496. doi: 10.13544/j.cnki.jeg.2020-053.
    引用本文: 李坤全,黎平,魏敏章,等. 2021. 长庆油田黄3区长8特低渗油藏二氧化碳驱油与埋存先导试验[J]. 工程地质学报,29(5):1488-1496. doi: 10.13544/j.cnki.jeg.2020-053.
    Li Kunquan, Li Ping, Wei Minzhang, et al. 2021. A pilot project of CO2 enhanced oil recovery and storage in Chang 8 extra-low permeability reservoir in Huang 3 district of Changqing oilfield [J]. Journal of Engineering Geology, 29(5): 1488-1496. doi: 10.13544/j.cnki.jeg.2020-053.
    Citation: Li Kunquan, Li Ping, Wei Minzhang, et al. 2021. A pilot project of CO2 enhanced oil recovery and storage in Chang 8 extra-low permeability reservoir in Huang 3 district of Changqing oilfield [J]. Journal of Engineering Geology, 29(5): 1488-1496. doi: 10.13544/j.cnki.jeg.2020-053.

    长庆油田黄3区长8特低渗油藏二氧化碳驱油与埋存先导试验

    A PILOT PROJECT OF CO2 ENHANCED OIL RECOVERY AND STORAGE IN CHANG 8 EXTRA-LOW PERMEABILITY RESERVOIR IN HUANG 3 DISTRICT OF CHANGQING OILFIELD

    • 摘要: 为了评价CO2驱在长庆油田特低渗油藏中的适应性及应用潜力,中国石油长庆油田进行了CO2驱油与埋存先导试验技术研究,取得了令人满意的初步效果。在综合对比周边气源条件、油藏条件、现场道路及CO2试运输的基础上,确定姬源油田黄3区长8油藏为先导试验区块。该区块油藏规模大,油藏条件具有达到混相驱的条件,周边气源丰富,现场道路条件好,属于低渗透开发早期油藏,但水驱开采效率低,开发效果逐年下降。先导试注效果显示:在CO2驱的作用下,黄3区长8油藏部分油井的日产液量及日产油量明显上升,且含水率下降。与水驱注入压力相比较,CO2注入压力无明显上升,且不随注入量的多少而变化,说明黄3区长8油藏具有较好的CO2注入性和良好的吸气能力。同时结果表明,所选取的CO2注入参数设计基本合理,CO2驱具有进一步在长庆油田推广的良好前景。然而,由于CO2注入压力较水驱上升幅度较低,原方案的周期注气方式、注入速率及注入压力上限等仍有实行进一步优化的空间。此外,为了提升试验效果,可逐步扩大试验规模,以便CO2驱试验在长庆油田范围内的整体性评价分析。

       

      Abstract: In order to evaluate the adaptability and application potential of CO2 flooding in the extra-low permeability reservoir, Changqing oilfield carried out a pilot project of CO2 enhanced oil recovery and storage and obtained satisfactory results. Given the surrounding gas source conditions, reservoir conditions, field road and CO2 trial transportation, the Chang 8 reservoir in Huang 3 district was determined as the pilot test block for CO2 enhanced oil recovery and storage engineering. The reservoir is characterized by a large scale, abundant surrounding gas sources, and good field road conditions. In addition, the reservoir condition can be able to reach the condition of miscible flooding. However, it is an ultra-low permeability reservoir and in the early development stage, showing a steady decline in the production efficiency by water flooding. The field test result of CO2 flooding pilot shows that the daily oil production and daily gas production increases significantly, while the water content decreases after CO2 flooding, indicating that CO2 flooding has a good prospect for further promotion in Changqing oilfield. Compared to water flooding, the injection pressure is independent with the injection volume and without significant increase, indicating that the test reservoir has a good capacity for CO2 injection and storage. However, the change of injection pressure is relatively lower than that of water flooding, optimization has to be applied to the parameters of gas injection mode, injection rate and pressure for the further application of CO2 flooding. In addition, in order to improve the effect of CO2 flooding and facilitate the overall evaluation of the pilot project, it is suggested that the scale of the pilot project can be further expanded in the future.

       

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