Feasibility of Supercritical CO2 Huff-Puff Development of Tight Conglomerate Reservoirs

doi:10.7657/XJPG20210409

Abstract

Abstract:

CO₂ huff-puff development has unique mechanisms such as dissolution, extraction and miscibility and supercritical CO₂ has better injectivity, penetrability and extraction of light components. In order to further understand the feasibility of supercritical CO₂ huff-puff in enhancing oil recovery of tight conglomerate, based on supercritical CO₂ crude oil interaction, supercritical CO₂ crude oil extraction experiment and supercritical CO₂ huff-puff indoor physical simulation, oil property changes and stimulation mechanism during huff-puff process were revealed, and the recovery factors obtained with different injection parameters were determined. The results show that supercritical CO₂ can effectively supplement formation energy, reduce viscosity and density of crude oil, and improve mobility of crude oil. The recovery factor was improved by 22.16% after injecting 0.50 PV of supercritical CO₂; with the increase of supercritical CO₂ injection rate, the recovery factor increased but the replacement ratio decreased. Compared with the single round stimulation, the recovery efficiency of the four-round huff-puff can be increased by 20%~24%. The recovery factor was 22.16% after soaking for 120 minutes, but changed little after soaking for 240 minutes. The findings demonstrate that it is feasible to enhance the recovery by implementing supercritical CO₂ huff-puff development after depletion development in tight conglomerate reservoirs, which provides a reference to the development of tight conglomerate reservoirs.

Key words: tight conglomerate reservoir, supercritical CO₂ huff-puff, crude oil mobility, recovery factor, feasibility, injection parameter

CLC Number:

TE357

PU Wanfen, WANG Yangsong, LI Longwei, GAO Haiming, SHAN Dongbai, WANG Wenke. Feasibility of Supercritical CO₂ Huff-Puff Development of Tight Conglomerate Reservoirs[J]. Xinjiang Petroleum Geology, 2021, 42(4): 456-461.

Figures/Tables 10

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Feasibility of Supercritical CO₂ Huff-Puff Development of Tight Conglomerate Reservoirs

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