Special Oil & Gas Reservoirs >

2021 , Vol. 28 >Issue 3: 118 - 123

DOI: https://doi.org/10.3969/j.issn.1006-6535.2021.03.018

Reservoir Engineering

Experimental Study on Improving Recovery Efficiency of Tight Oil Reservoirs with Supercritical Carbon Dioxide Flooding

  • Zhou Xiang ,
  • Zhou Dan ,
  • Deng Jiasheng ,
  • Deng Jingyi ,
  • Ray Rui ,
  • Jiang Zheren
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  • 1. Southwest Petroleum University, Chengdu, Sichuan 610500, China;
    2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploration, Chengdu, Sichuan 610500, China;
    3. PetroChina Xinjiang Oilfield Company, Karamay, Xinjiang 834000, China;
    4. Massachusetts Institute of Technology, Cambridge, MA 02139, USA;
    5. Engineering Services Company of CNPC Great Wall Drilling Company, Panjin, Liaoning 124010, China

Received date: 2020-09-07

  Revised date: 2021-03-12

  Online published: 2022-02-16

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Abstract

In view of rapid decline in oil recovery rate in the late stage of natural depletion of tight oil reservoirs in the Mahu area, a study design of developing tight oil reservoirs with supercritical CO2 displacement was put forward. The experiments on tight oil extraction with supercritical CO2, minimum miscibility pressure and long core displacement were conducted to study the mechanism, development characteristics and influence factors of improving recovery efficiency of tight oil reservoirs with supercritical CO2 displacement, and optimize important operating parameters such as gas injection rate and CO2 injection occasion. The experimental results show that the capacity of light component after CO2 extraction decreased with the increase of extraction times; the gas injection rate had a greater impact on the final recovery efficiency, and the optimal gas injection rate was 0.10 cm3/min; the minimum miscibility pressure of crude oil and supercritical CO2 was 34.18 MPa; the current pressure in the reservoir was the best occasion for CO2 injection. The study results play a guiding role in the efficient development of tight oil reservoirs.

Key words： supercritical carbon dioxide; tight oil reservoirs; improve recovery efficiency; carbon dioxide flooding; optimization of injection occasion; Mahu Area

Cite this article

Zhou Xiang , Zhou Dan , Deng Jiasheng , Deng Jingyi , Ray Rui , Jiang Zheren . Experimental Study on Improving Recovery Efficiency of Tight Oil Reservoirs with Supercritical Carbon Dioxide Flooding[J]. Special Oil & Gas Reservoirs, 2021 , 28(3) : 118 -123 . DOI: 10.3969/j.issn.1006-6535.2021.03.018

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