Experiments on Controlling Gas Channeling in Low-Permeability Reservoirs by Enhanced CO2 Foam System With Nano-Microspheres

doi:10.7657/XJPG20210413

Abstract

Abstract:

The development of the gas-injection pilot area with small well spacing in Block Hei-46 in Jilin oilfield has entered its middle to late stage characterized by serious water channeling and gas channeling. An enhanced CO₂ foam system with nanosphere particles which is composed of three phases, namely gas, liquid and solid has been tested on controlling gas channeling. The experiment results show that the optimal composition of the enhanced CO₂ foam system with nano-microsphere particles includes 0.10% FA-1, 0.50% FA-2 and 0.10% M-1 (mass fraction); at different temperature and salinity the performance of the enhanced CO₂ foam system is much better than a conventional CO₂ foam, and the resistance factor of the former is increased by 20.03%; when the permeability difference of parallel cores is 5.80, the profile improvement rate of the enhanced foam system is 14.29% higher than that of the conventional CO₂ foam; when the permeability difference of parallel cores is 4.34, the final recovery factor is 79.97%, and the enhanced CO₂ foam system can increase the recovery by 15.53% based on conventional gas flooding.

Key words: Jilin oilfield, low-permeability reservoir, high-temperature oil reservoir, gas channeling, nanosphere particle, CO₂ foam system

CLC Number:

TE357.435

ZHAO Yunhai, WANG Jian, HUANG Weihao, ZHANG Liwei, PENG Qilin, DU Hong. Experiments on Controlling Gas Channeling in Low-Permeability Reservoirs by Enhanced CO₂ Foam System With Nano-Microspheres[J]. Xinjiang Petroleum Geology, 2021, 42(4): 480-486.

Figures/Tables 9

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References 21

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Experiments on Controlling Gas Channeling in Low-Permeability Reservoirs by Enhanced CO₂ Foam System With Nano-Microspheres

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