Special Oil & Gas Reservoirs >

2021 , Vol. 28 >Issue 3: 112 - 117

DOI: https://doi.org/10.3969/j.issn.1006-6535.2021.03.017

Reservoir Engineering

Study on Injection Mode of CO2 Flooding Based on Physical Model of Fracture Radial Flow

  • Shi Lihua ,
  • Wang Weibo ,
  • Wang Chengjun ,
  • Chen Longlong
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  • 1. China University of Petroleum (Beijing), Beijing 102249, China;
    2. Shaanxi Engineering Technology Research Center for Exploration and Development of Extra-Low Permeability Oil and Gas Fields, Xi'an, Shaanxi 710065, China;
    3. Shaanxi Yanchang Petroleum (Group) Co., Ltd., Xi'an, Shaanxi 710065, China;
    4. Xi'an Shiyou University, Xi'an, Shaanxi 710065, China

Received date: 2020-06-17

  Revised date: 2021-03-21

  Online published: 2022-02-16

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Abstract

Aiming at the optimization of different injection methods of CO2 flooding after water flooding, based on the physical model of fracture radial flow, indoor experiment was conducted on CO2 compound flooding in single fracture and complex fracture in five-spot well pattern (one well in injection and four other wells in production) to study the effect of CO2 flooding with different injection processes after water flooding in low-permeability fractured reservoir. The results showed that: after the water flooding of the single fracture model, different injection processes, such as continuous CO2 flooding, modified starch gel injection and ethylenediamine injection, were implemented successively, the recovery percent of the reservoir increased firstly and then decreased, and finally the recovery efficiency could be increased by 65.7% on the basis of the single-fracture water flooding; after water flooding of complex fracture model, different injection processes, different injection processes such as continuous CO2 flooding, modified starch gel injection, ethylenediamine injection and water alternate gas, were implemented successively; the effect of water alternate gas on improving CO2 flooding effect was the best and the recovery efficiency could be increased by 28.89% on the basis of single-fracture water flooding. The study results play a guiding role in CO2 flooding after water flooding in low-permeability fractured reservoirs.

Key words： low permeability; fractures; physical simulation; CO2 flooding; gas channeling; water and gas alternation; modified starch gel

Cite this article

Shi Lihua , Wang Weibo , Wang Chengjun , Chen Longlong . Study on Injection Mode of CO2 Flooding Based on Physical Model of Fracture Radial Flow[J]. Special Oil & Gas Reservoirs, 2021 , 28(3) : 112 -117 . DOI: 10.3969/j.issn.1006-6535.2021.03.017

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