Petroleum Reservoir Evaluation and Development >

2021 , Vol. 11 >Issue 6: 831 - 836

DOI: https://doi.org/10.13809/j.cnki.cn32-1825/te.2021.06.005

Methodological and Theory

Feasibility of enhanced oil recovery by CO2 huff-n-puff in tight conglomerate reservoir

  • Xibin FAN ,
  • Wanfen PU ,
  • Jiangtao SHAN ,
  • Daijun DU ,
  • Jianhua QIN ,
  • Yang GAO
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  • 1. Research Institute of Petroleum Exploration and Development, Xinjiang Oilfield Company, PetroChina, Karamay, Xinjiang 834000, China
    2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China

Received date: 2020-06-10

  Online published: 2021-12-31

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Abstract

Based on the interactions between CO2 and crude oil, CO2 and conglomerate, the enhanced oil recovery（EOR） mechanism of CO2 huff-n-puff has been revealed in Huanmahu tight conglomerate reservoir. Meanwhile, a high temperature and high pressure nuclear magnetic system was applied to monitor the change of oil saturation during experimental processes at pore scale in cores of substrates. Core fracturing and displacement system were used to investigate the effects of fractures on EOR during CO2 huff-n-puff. The experimental results indicated that CO2 could effectively dissolve in crude oil to replenish formation energy, reduce oil viscosity and improve wettability. Moreover, the crude oil produced in depletion development was in large pores, while that in medium pores and small pores could be effectively activated by CO2 huff-n-puff. After depletion development, three cycles of huff-n-puff could enhance oil recovery by 23.1 %, among which the first cycle contributed most with factor of 15.1 %. The existence of fractures could increase the contact area between crude oil and CO2 and decrease the flow resistance of crude oil, and finally the EOR is up to 27.1 %. All the results reveal the feasibility of CO2 huff-n-puff to improve oil recovery in tight conglomerate reservoirs from pore scale.

Key words： enhanced oil recovery（EOR）; CO2 huff-n-puff; tight conglomerate reservoir; fractures; NMR; three-dimensional physical simulation

Cite this article

Xibin FAN , Wanfen PU , Jiangtao SHAN , Daijun DU , Jianhua QIN , Yang GAO . Feasibility of enhanced oil recovery by CO2 huff-n-puff in tight conglomerate reservoir[J]. Petroleum Reservoir Evaluation and Development, 2021 , 11(6) : 831 -836 . DOI: 10.13809/j.cnki.cn32-1825/te.2021.06.005

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