Special Oil & Gas Reservoirs >

2023 , Vol. 30 >Issue 2: 128 - 133

DOI: https://doi.org/10.3969/j.issn.1006-6535.2023.02.018

Reservoir Engineering

Effect of Water Saturation on CO2 Huff-n-Puff in Tight Reservoirs

  • Wang Yingwei ,
  • Zhang Yulong ,
  • Zhang Jing ,
  • Shi Leiting ,
  • Fan Xibin ,
  • Wang Ruiqi
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  • 1. PetroChina Xinjiang Oilfield Company, Karamay, Xinjiang 834000, China;
    2. State Key Laboratory of Oil and Gas Reservoir Geology and Development Engineering, Chengdu, Sichuan 610500, China

Received date: 2022-04-11

  Revised date: 2022-10-25

  Online published: 2023-05-29

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Abstract

The change of oil saturation in the reservoir will affect the interaction between CO2 and reservoir fluid. In order to study the effect of water saturation on the oil recovery of glutenite tight reservoir by CO2 huff-n-puff, tests were conducted on the dissolution, expansion and huff-n-puff of CO2 in oil and water at different water saturation based on the reservoir conditions of Mahu glutenite tight reservoirs, Xinjiang. The results show that as the water saturation was increased, the solubility of CO2 in oil and water was decreased from 6.08 mol/L to 2.01 mol/L, the expanding volume was decreased from the highest 1.53 times to 1.09 times, the effect of CO2 interaction with crude oil gradually weakened, and the maximum cumulative recovery percent was 20.21%; the development effect of CO2 huff-n-puff was better when the water saturation was less than 45.0%; when the water saturation was lower than 50.3%, asphaltene deposition was dominant, with decrease in reservoir permeability; when the water saturation was higher than 50.3%, mineral dissolution was dominant, with increase in reservoir permeability. The study results play a guiding role in the efficient development of tight oil reservoirs.

Key words： glutenite tight reservoir; solubility; expansion; CO2 huff-n-puff; permeability

Cite this article

Wang Yingwei , Zhang Yulong , Zhang Jing , Shi Leiting , Fan Xibin , Wang Ruiqi . Effect of Water Saturation on CO2 Huff-n-Puff in Tight Reservoirs[J]. Special Oil & Gas Reservoirs, 2023 , 30(2) : 128 -133 . DOI: 10.3969/j.issn.1006-6535.2023.02.018

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