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Special Topics & Reviews in Porous Media: An International Journal
ESCI SJR: 0.277 SNIP: 0.52 CiteScore™: 1.3

ISSN Imprimer: 2151-4798
ISSN En ligne: 2151-562X

Special Topics & Reviews in Porous Media: An International Journal

DOI: 10.1615/SpecialTopicsRevPorousMedia.2017019861
pages 377-384

EXPERIMENTAL METHODS AND APPLICATIONS OF DISSOLVED GAS DRIVING IN TIGHT OIL RESERVOIRS

Yunyun Wei
University of Chinese Academy of Sciences, Beijing 100190, China; Institute of Porous Flow and Fluid Mechanics, Chinese Academy of Sciences, Langfang 065007, China; Langfang Branch of Research Institute of Petroleum Exploration and Development, Langfang 065007, China
Xizhe Li
Institute of Porous Flow and Fluid Mechanics, Chinese Academy of Sciences, Langfang 065007, China; Langfang Branch of Research Institute of Petroleum Exploration and Development, Langfang 065007, China
Zhengming Yang
Institute of Porous Flow and Fluid Mechanics, UCAS, Hebei, 065007, China; PetroChina Research Institute of Petroleum Exploration and Development, Langfang, 065007, China
Xuewei Liu
Institute of Porous Flow and Fluid Mechanics, Chinese Academy of Sciences, Langfang, 065007, China; Langfang Branch of Research Institute of Petroleum Exploration and Development, Langfang, 065007, China

RÉSUMÉ

Because most of the tight reservoirs have a high gas-oil ratio during their development process, it is difficult to establish an effective gas driving pressure difference due to the small throat sizes, which results in a dissolved gas driving process. During the development process, when the pressure reached a certain value a sharp decline in production occurred, which exerted a great impact on the development. In this paper, the experimental methods of dissolved gas driving in tight reservoirs are established, and the effect of gas precipitation on the process is simulated to its maximum extent. The experiments are carried out by using a typical block of dense rock in domestic China by combining the means of high-pressure, microscopic technology with visualized physical simulation technology, revealing the seepage mechanism of dissolved gas driving in tight oil reservoirs. Experimental results show that the seepage resistance occurred during the degasification, and accumulation in the dissolved gas driving type oil reservoir is the main reason for the decrease of the production capacity. However, this impact might be mitigated by controlling such pressures during the development process, and a reasonable controlling method of pressure is put forward in the meantime, which also is successfully applied to this tight oil block. The results of this study may offer some theoretical guidance for the effective development of tight oil reservoirs to some extent.


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