Phase State and Component Change Law of CO2 Flooding in Low-Permeability Sandstone Reservoirs

doi:10.3969/j.issn.1006-6535.2022.06.011

Abstract

Abstract: To work out the phase state, changes in oil and gas components and the response of crude oil to gas injection in the gas injection development of Block W in low-permeability sandstone reservoirs, classical theories such as mass conservation and equation of state were employed to study the characteristics of crude oil component changes by gas injection expansion, gas chromatography test and PVT phase equilibrium simulation software, with CO₂ gas as injection medium. The result shows: When the CO₂ injection amount increased to 0.814 mol, the bubble point pressure increased by 0.96 times, the sample volume expanded by 2.09 times, and the CO₂ content in the fluid gradually increased from 0.6% of the background value to 81.0%, indicating that the bubble point pressure was mainly under the control from the light hydrocarbon components, and the crude oil components changed significantly due to the dissolution and separation of gas. This study technically supports the oil recovery enhancement by gas injection, the design of oil and gas transmission technology, and the preparation of development plan of low-permeability sandstone reservoirs in Dongpu Sag, as well as having important practical significance for its development.

Key words: Phase state, components, bubble point pressure, state equation, CO₂, low-permeability sandstone reservoirs

CLC Number:

TE345

Liu Jianyi, Yang Xue, Liu Yong. Phase State and Component Change Law of CO₂ Flooding in Low-Permeability Sandstone Reservoirs[J]. Special Oil & Gas Reservoirs, 2022, 29(6): 91-96.

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Phase State and Component Change Law of CO₂ Flooding in Low-Permeability Sandstone Reservoirs

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