Analysis of Influencing Factors on the Development Effect of CO2 Assisted Gravity Flooding

doi:10.3969/j.issn.1006-6535.2022.06.017

Abstract

Abstract: To address the problem that the effect of various geological parameters on the development of CO₂-assisted gravity flooding technology is still unclear, taking a medium and low permeability oil reservoir as the research object, a number of theoretical models of one-injection and one-recovery mechanism were established to study the influence of the formation sedimentary rhythm, dip angle, permeability, porosity, ratio of vertical permeability to horizontal permeability, and permeability max-min ratio on the effect of the CO₂-assisted gravity flooding. The result shows: The CO₂-assisted gravity flooding is more suitable for positive rhythm sedimentary strata than negative rhythm strata; there is a certain formation dip, which is conducive to gravitational differentiation and formation of gas caps; the CO₂-assisted gravity flooding is carried out in medium-low permeability and low-porosity oil reservoirs, which has a certain effect on the inhibition of gas channeling breakthrough. The smaller the ratio of vertical permeability to horizontal permeability, the more conducive to inhibiting the rapid vertical diffusion of gas. The permeability max-min ratio has little effect on CO₂-assisted gravity flooding. The influence of different geological factors on the recovery degree is the ratio of vertical permeability to horizontal permeability, formation dip angle, formation permeability, formation porosity, formation permeability max-min ratio in descending order. The field test of the A Reservoir shows that CO₂-assisted gravity flooding can increase the stage cumulative oil production by more than 3 times, and can achieve a significant increase in production. The research results can provide theoretical guidance for the development of CO₂ flooding in similar oilfields.

Key words: gas-assisted gravity flooding, reservoir numerical simulation, reservoir physical properties, influencing factors, orthogonal experimental design

CLC Number:

TE349

Lei Meng, Qu Yaguang, Wan Cuirong, Yang Bo, He Denghui, Ma Guoqing, Gong Xu. Analysis of Influencing Factors on the Development Effect of CO₂ Assisted Gravity Flooding[J]. Special Oil & Gas Reservoirs, 2022, 29(6): 133-140.

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Analysis of Influencing Factors on the Development Effect of CO₂ Assisted Gravity Flooding

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