Enhanced Oil Recovery Experiment of Foam Oil Cold Recovery Induced by Water-Alternating-Gas Injection in Heavy Oil Reservoirs

doi:10.3969/j.issn.1006-6535.2024.01.013

Abstract

Abstract: Aiming at the problems of viscous indexing, insufficient producing, and low recovery in the process of water flooding in ordinary heavy oil reservoirs, based on Ji 7 Reservoir in Xinjiang Oilfield, the foam oil cold recovery technology was researched induced by water-alternating-gas injection, and the foam oil sample preparation device was designed by itself. The image of foam oil was characterized by Image J software, and the performance, bubble diameter, and foam number of foam oil were comprehensively analyzed; the visual plane model was designed and made to research the microscopic oil displacement mechanism of foam oil during gas injection assisted water flooding in heavy oil reservoir; the core displacement experiment was carried out to optimize the injection parameters of foam oil cold recovery induced by water-alternating-gas. The research shows that the foam oil formed by CO₂ in low-viscosity crude oil has better performance; the foaming volume is 202.1 mL, the half-life is 324 s, and the viscosity reduction rate is 32.35%; the foaming volume and half-life of foam oil are usually negatively correlated with the bubble diameter and the number of foam oil; the foam oil polymerization has a stripping effect on viscous wall residual oil, and CO₂ can effectively produce crude oil, oil film, and upper crude oil in small pore throat; under the condition of the gas-liquid ratio of 1∶1, the injection pressure of 30 MPa, and flooding rate of 0.2 mL/min, the foam oil cold recovery induced by water-alternating-gas could improve recovery by 18.90% compared with the ordinary water flooding in the heavy oil reservoir. The research results provide a theoretical basis for the foam oil cold recovery induced by water-alternating-gas injection in Ji 7 reservoir of Xinjiang Oilfield and also provide a reference for the enhanced oil recovery technology of water flooding heavy oil reservoirs in other oilfields.

Key words: ordinary heavy oil, foam oil, bubble diameter calculation, microscopic oil displacement mechanism, parameter optimization, Ji 7 reservoir

CLC Number:

TE357.7

Zhen Guinan, Wang Jian, Wu Baocheng, Wang Weilong, Tang Yang, Lu Yuhao. Enhanced Oil Recovery Experiment of Foam Oil Cold Recovery Induced by Water-Alternating-Gas Injection in Heavy Oil Reservoirs[J]. Special Oil & Gas Reservoirs, 2024, 31(1): 101-108.

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