Enhancing Oil Recovery in Low Permeability Reservoirs through CO 2 Miscible Flooding: Mechanisms and Dynamics.

Autor:	Chen X; School of Engineering Science, University of Chinese Academy of Science, Beijing 100049, China.; Institute of Porous Flow and Fluid Mechanics, Chinese Academy of Sciences, Langfang, Hebei 065007, China.; Research Institute of Petroleum Exploration and Development, PetroChina Company Limited, Beijing 100083, China., Yang Z; Institute of Porous Flow and Fluid Mechanics, Chinese Academy of Sciences, Langfang, Hebei 065007, China.; Research Institute of Petroleum Exploration and Development, PetroChina Company Limited, Beijing 100083, China., Yu H; Research Institute of Petroleum Exploration and Development, PetroChina Company Limited, Beijing 100083, China., Niu Z; School of Engineering Science, University of Chinese Academy of Science, Beijing 100049, China.; Institute of Porous Flow and Fluid Mechanics, Chinese Academy of Sciences, Langfang, Hebei 065007, China.; Research Institute of Petroleum Exploration and Development, PetroChina Company Limited, Beijing 100083, China., Li W; Tianjin Branch, China National Offshore Oil Corporation, Tianjin 300450, China., Jia N; Research Institute of Petroleum Exploration and Development, PetroChina Company Limited, Beijing 100083, China., Wang W; Daqing Yushulin Oilfield Development Company Limited, Daqing, Heilongjiang 163000, China., Zhang Y; Institute of Porous Flow and Fluid Mechanics, Chinese Academy of Sciences, Langfang, Hebei 065007, China.; Research Institute of Petroleum Exploration and Development, PetroChina Company Limited, Beijing 100083, China., Li H; Institute of Porous Flow and Fluid Mechanics, Chinese Academy of Sciences, Langfang, Hebei 065007, China.; Research Institute of Petroleum Exploration and Development, PetroChina Company Limited, Beijing 100083, China., Chang Y; School of Engineering Science, University of Chinese Academy of Science, Beijing 100049, China.; Institute of Porous Flow and Fluid Mechanics, Chinese Academy of Sciences, Langfang, Hebei 065007, China.; Research Institute of Petroleum Exploration and Development, PetroChina Company Limited, Beijing 100083, China.
Jazyk:	angličtina
Zdroj:	ACS omega [ACS Omega] 2024 Dec 03; Vol. 9 (50), pp. 49336-49347. Date of Electronic Publication: 2024 Dec 03 (Print Publication: 2024).
DOI:	10.1021/acsomega.4c06509
Abstrakt:	Understanding the dynamic characterization of the CO 2 miscible flooding process in low permeability reservoirs and its mechanism for oil recovery enhancement is crucial for controlling CO 2 miscible flooding sweep efficiency and further enhancing oil recovery. This study was conducted in a low permeability reservoir in Jilin, China, using both online nuclear magnetic resonance CO 2 miscible flooding and long-core CO 2 miscible flooding experiments. A refined dynamic characterization of the CO 2 miscible flooding process from the macroscopic core scale to the microscopic pore scale was achieved through multiple spatial online nuclear magnetic resonance testing methods. Analysis of dynamic characteristics of physical parameters was based on long-core displacement experiments and gas chromatography. This study summarizes the influence mechanism of CO 2 miscible flooding on enhanced oil recovery in low permeability reservoirs and demonstrates the feasibility of CO 2 miscible flooding. The results indicated that (1) CO 2 miscible flooding enables simultaneous oil recovery from micro-, meso-, and macropores, significantly improving displacement efficiency. (2) The recovery process unfolds in two stages: the initial CO 2 miscible flooding stage before gas breakthrough and the subsequent CO 2 miscible transport stage after gas breakthrough. (3) Both stages are instrumental in expanding the macroscopic swept range of CO 2 , thereby enhancing oil recovery. (4) The miscibility of CO 2 with crude oil can affect the oil's composition. (5) The combined effect of miscible flooding and transport underpins the high displacement efficiency of CO 2 miscible flooding. Emphasizing these critical aspects could enhance oil recovery from CO 2 miscible flooding in field production. Competing Interests: The authors declare no competing financial interest. (© 2024 The Authors. Published by American Chemical Society.)
Databáze:	MEDLINE
Externí odkaz:	Zobrazit plný text záznamu