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WANG Xiaoyu, REN Haojie, GUANG Yichu, et al. Experimental study on improving condensate oil recovery by CO2 huff and puff in condensate gas reservoirs [J]. Petroleum Drilling Techniques, 2025, 53(1)：86−93. DOI: 10.11911/syztjs.2025011
Citation: WANG Xiaoyu, REN Haojie, GUANG Yichu, et al. Experimental study on improving condensate oil recovery by CO2 huff and puff in condensate gas reservoirs [J]. Petroleum Drilling Techniques, 2025, 53(1)：86−93. DOI: 10.11911/syztjs.2025011
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Experimental Study on Improving Condensate Oil Recovery by CO2 Huff and Puff in Condensate Gas Reservoirs

  • Laojunmiao Oil Production Plant, PetroChina Yumen Oilfield Company, Jiuquan, Gansu, 735019, China

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  • Received Date: June 23, 2023
  • Revised Date: January 06, 2025
  • Available Online: January 20, 2025
    Graphical Abstract
    • Abstract

  • The application of CO2 injection to improve the recovery of natural gas and condensate oil is still in the development stage. The CO2 injection mode, injection time, and the interaction mechanism between CO2 and reservoir fluid are not clear. Through the constant volume depletion experiment of CO2 injection into condensate gas reservoirs and the measurement experiment of oil-gas interfacial tension, a stepwise incremental CO2 huff and puff method was proposed on the basis of determining the maximum retrograde condensate pressure, liquid volume, and CO2-condensate oil interaction mode. In addition, the huff and puff effect and CO2 storage ratio were evaluated by full diameter core experiment. The results show that after the CO2 is injected into the condensate gas reservoir, the dew point pressure, the maximum retrograde condensate pressure, and the condensate oil volume are continuously reduced, and the critical point moves to the lower left corner. The two-phase envelope area shrinks inward, and the fluid components become lighter. The phase mixing between CO2 and condensate oil can be achieved gradually only after multiple contacts. A higher CO2 pressure indicates fewer contacts required to achieve the phase mixing. The condensate oil recovery after four rounds of incremental CO2 huff and puff is 1.2%, 14.4%, 25.8%, and 3.6%, respectively, which is 45.0 percentage points higher than that after natural depletion. The proportion of CO2 storage decreases with the increase in huff and puff times, which are 82.2%, 72.1%, 46.4%, and 9.2%, respectively. CO2 huff and puff times should be controlled within 3 to achieve the optimal effect. The CO2 huff and puff effect is mainly affected by CO2 injection pressure and core system pressure. When the CO2 injection pressure is lower than the minimum miscible pressure (MMP), it is not conducive to CO2 huff and puff and storage. The research results provide a reference for the efficient development of condensate gas reservoirs and the improvement of retrograde condensate damage.

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