Special Oil & Gas Reservoirs >

2024 , Vol. 31 >Issue 1: 101 - 108

DOI: https://doi.org/10.3969/j.issn.1006-6535.2024.01.013

Reservoir Engineering

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

  • Zhen Guinan ,
  • Wang Jian ,
  • Wu Baocheng ,
  • Wang Weilong ,
  • Tang Yang ,
  • Lu Yuhao
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  • 1. PetroChina Xinjiang Oilfield Company, Changji, Xinjiang 831700, China;
    2. National Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu,Sichuan 610500, China

Received date: 2022-07-04

  Revised date: 2024-01-10

  Online published: 2024-04-18

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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

Cite this article

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 . DOI: 10.3969/j.issn.1006-6535.2024.01.013

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