Test of CO2 Miscible Fracturing and Huff and Puff

doi:10.3969/j.issn.1006-6535.2022.05.018

Abstract

Abstract: To address the problem of poor development of conventional hydraulic fracturing in V Formation of Fault Block Gao 5, Nanpu Sag, PVT and core miscible huff and puff tests were conducted to clarify the mechanism of enhancing oil recovery by CO₂ miscible fracturing and huff and puff, and the technical effectiveness was further verified by field tests. The study results showed that: at the current formation pressure (33.00 MPa), CO₂ and crude oil could be mixed, and the crude oil volume was expanded by 41.01%, the viscosity decreased by 33.08%, and the density increased by 7.28% after the injection of CO₂ with a mole fraction of 60%, and CO₂ was effective in solubilization, expansion and viscosity reduction of crude oil; the recovery efficiency could reach more than 60% by miscible fracturing and huff and puff. After CO₂ miscible fracturing and huff and puff, the production of test wells was stable for 26 months, with a cumulative increase of 2 200 t in oil production, and the heavy components of crude oil were effectively utilized. The study provides an effective technical approach for the profitable development of low-permeability tight reservoirs.

Key words: low-permeability reservoir, CO₂ huff and puff in miscible fracturing, enhanced oil recovery, minimum miscible pressure, Nanpu Sag

CLC Number:

TE357.28

Wu Junfeng, Liu Baozhong, Liu Daojie, Wang Changquan, Li Yinghui, Liu Guohua. Test of CO₂ Miscible Fracturing and Huff and Puff[J]. Special Oil & Gas Reservoirs, 2022, 29(5): 126-131.

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Test of CO₂ Miscible Fracturing and Huff and Puff

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