التفاصيل البيبلوغرافية
| العنوان: |
海上砂岩油藏注自生 CO2体系 实验及提高采收率机理. (Chinese) |
| العنوان البديل: |
In⁃situ CO2 generation system injection experiment and EOR mechanism for offshore sandstone reservoirs. (English) |
| المؤلفون: |
郑玉飞, 李 翔, 刘文辉, 冯 轩, 宫汝祥, 王 硕 |
| المصدر: |
Petroleum Geology & Oilfield Development in Daqing; Aug2023, Vol. 42 Issue 4, p113-121, 9p |
| مصطلحات موضوعية: |
ENHANCED oil recovery, INTERFACIAL tension, POROSITY, CHEMICAL properties, BIOSURFACTANTS |
| الملخص (بالإنجليزية): |
Facing the problem of unclear mechanism of enhanced oil recovery due to diversified stimulation functions of in ‑ situ CO2 generation technology, the main stimulation mechanisms are determined comprehensively by physico‑ chemical properties evaluation, core displacement and structural characterization experiments, and by study on system formula, interfacial tension, oil viscosity, enhanced recovery effect and changes of core pore throats structure. The results show that the optimum amount‑of‑substance concentration ratio of gas‑generating agent to gas‑releasing agent is 1∶2 and the optimum system mass fraction is 21.5%, with gas generation efficiency close to the maximum value. In‑situ CO2 generation system has high displacement efficiency in both homogeneous and heterogeneous cores. The EOR mechanism of in‑situ CO2 generation system injection mainly includes: ①gas‑generating agent(alkaline) reduces the interfacial tension between oil and system(IFT); ②the CO2 produced in the formation expands the oil and reduces oil viscosity; ③the heat released by reaction of gas‑generating agent and gas‑releasing agent dissolves organic matter and increases recovery. The pressure fluctuations in the process of CO2 generation and clogs removing also help changing the displacement path. The research results provide basis for optimization and field application of in‑situ CO2 generation technology. [ABSTRACT FROM AUTHOR] |
| Abstract (Chinese): |
针对自生CO2技术增产功能多元化、提高采收率机理认识不清的问题，综合利用理化性能评价、岩心驱替及结构表征 实验，通过研究体系配方、界面张力、原油黏度、提高采收率效果及岩心孔喉结构的变化，明确了自生 CO2技术的主要增 产机理。实验结果表明：自生 CO2体系中最佳的生气剂与释气剂物质的量浓度比为 1∶2，最佳体系质量分数为 21.5%，此 时的 CO2生气效率接近最大值。自生 CO2体系在均质和非均质岩心中均具有良好的驱替效率，注入自生 CO2体系提高原油采 收率 （EOR） 的机理主要包括：①体系中的生气剂 （碱性） 可以降低原油与体系间的界面张力 （IFT）；②在地层中产生的 CO2会使原油膨胀、降低原油黏度；③生气剂与释气剂反应放热可溶解有机物并提高采收率，CO2生成过程和清除堵塞引起 的压力波动也有助于改变驱油路径、提高采收率。研究成果为自生CO2的技术优化和矿场实践提供了依据。 [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
Complementary Index |
