CO<subscript>2</subscript> 驱凝胶封窜体系研究进展. (Chinese)
In: Petroleum Geology & Recovery Efficiency, Jg. 30 (2023-03-01), Heft 2, S. 122-134
academicJournal
Zugriff:
Due to the large viscosity difference between oil and gas and the heterogeneity of oil reservoirs, gas channeling occurs during CO 2 flooding, reducing the sweep efficiency of CO 2 . Gel system is an effective channeling blocking agent for the process of CO 2 flooding and is widely used in China and abroad. This paper outlines the channeling blocking mechanisms and research progress of four kinds of gel systems:retardant cross-linked polyacrylamide gels, pre-crosslinked gel particles, two-stage channeling blocking gel systems, and foam gels. Retardant cross-linked acrylamide gels have good mobility and low price, although the gel strength and gelling time are uncontrollable. More importantly, they are not resistant to acid corrosion. Pre-crosslinked gel particles enjoy controllable gelling time and gel strength and are resistant to high temperature and high salinity. Nevertheless, their large particle size prevents them from entering formations with low permeability. The two-stage channeling blocking gel systems, combining the advantages of rigid gels with those of small molecules, can simultaneously block fractures of different sizes. However, their blocking effect decreases when fractures exceed a certain size. Foam gels cause little damage to the formation, although they are not resistant to high temperatures. At present, the gel systems used for gas channeling treatment during CO 2 flooding have the problem of irresistibility to acid corrosion. Keeping gel systems in CO 2 acid environments for a long time stable is the future research direction. [ABSTRACT FROM AUTHOR]
由于油气间黏度差异大和油藏的非均质性, 在 CO 2 驱油过程会发生气窜从而降低 CO 2 的波及效率。凝胶体系 是 CO 2 驱油过程中的有效封窜剂, 在中外都有着广泛的应用。介绍了延缓交联聚丙烯酰胺凝胶、预交联凝胶颗粒、 两级封窜凝胶体系、泡沫凝胶这4种凝胶体系的封窜机理以及研究进展。延缓交联丙烯酰胺凝胶流动性强, 价格低 廉, 但是成胶强度、成胶时间不可控并且不耐酸性腐蚀。预交联凝胶颗粒成胶时间、成胶强度可控且耐高温耐高矿 化度, 但是粒度较大, 无法进入渗透率较低的地层。两级封窜凝胶体系结合了刚性凝胶与小分子的优势, 能够同时 封堵不同尺寸的裂缝, 但是对于超过特定尺寸的裂缝, 封堵效果将会下降。泡沫凝胶对地层伤害小, 但是不耐高 温。目前, 用于 CO 2 驱气窜的凝胶体系存在着不耐酸性腐蚀的问题, 如何使长期处于 CO 2 酸性环境下的凝胶体系保 持稳定是未来的研究方向。 [ABSTRACT FROM AUTHOR]
Copyright of Petroleum Geology & Recovery Efficiency is the property of Petroleum Geology & Recovery Efficiency and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Titel: |
CO<subscript>2</subscript> 驱凝胶封窜体系研究进展. (Chinese)
|
---|---|
Autor/in / Beteiligte Person: | 刘雅婕 ; 琦, 刘 |
Zeitschrift: | Petroleum Geology & Recovery Efficiency, Jg. 30 (2023-03-01), Heft 2, S. 122-134 |
Veröffentlichung: | 2023 |
Medientyp: | academicJournal |
ISSN: | 1009-9603 (print) |
DOI: | 10.13673/j.cnki.cn37-1359/te.202106026 |
Schlagwort: |
|
Sonstiges: |
|