EOR Mechanism of Compound Gas Injection After Multiple Cycles of Oxygen-Reduced Air Huff and Puff in Heavy Oil Reservoirs

doi:10.7657/XJPG20220410

Abstract

Abstract:

For heavy oil reservoirs, the enhanced oil recovery (EOR) mechanism of injecting different gases or compound of gases after multiple cycles of oxygen-reduced air huff and puff following water flooding is unclear. In this paper, experiments were conducted with one-dimensional and three-dimensional physical models, and numerical simulations were performed on well pair model and inverted five-spot well pattern model. Based on the comparative analysis on production and components of oil recovered in different cycles of huff and puff and flow process research, the oil displacement and washing mechanisms during huff and puff with three gases, i.e. oxygen-reduced air, CO₂ and natural gas, in heavy oil reservoirs were discussed. The results show that the EOR mechanism of oxygen-reduced air huff and puff is dominated by water plugging, and the water front may readily break through after multiple cycles of operation and then fail quickly. The huff and puff with CO₂ slug followed by oxygen-reduced air plays a synergy of water plugging and remaining oil displacement. The huff and puff with oxygen-reduced air injection followed by natural gas dissolves the heavy components of the oil in near-wellbore area, achieving multiple effects of increasing energy, reducing viscosity and dredging pores. EOR mechanisms of huff and puff with three gases and their compound have been clarified through the experiments and numerical simulations on 10 cycles of huff and puff, and have been verified by field wells. The conclusions are of guiding significance for enhancing oil recovery by gas huff and puff in similar reservoirs.

Key words: heavy oil reservoir, compound huff and puff, multiple cycles of huff and puff, CO₂, oxygen-reduced air, physical model, numerical simulation

CLC Number:

TE328

GUO Xiaozhe, ZHAO Jian, GAO Wanglai, PU Yanan, LI Chenggeer, GAO Neng. EOR Mechanism of Compound Gas Injection After Multiple Cycles of Oxygen-Reduced Air Huff and Puff in Heavy Oil Reservoirs[J]. Xinjiang Petroleum Geology, 2022, 43(4): 450-455.

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