Effects of Injection Pressure on Gas Channeling during CO2 Flooding and a Study on Sealing of Cracks

doi:10.11885/j.issn.1674-5086.2016.05.29.03

Abstract

Abstract: To determine the impact of injection pressure on gas channeling during CO₂ flooding processes, different injection pressure schemes were set up according to actual oil recovery conditions, through which the breakthrough times with different injection pressures were measured. From this experiment, we obtained the variation of CO₂ breakthrough velocities and recovery rates with injection pressure. The results indicated that injection rate, base substrate permeability, and the size and width of cracks are the most important factors for injection pressure, and the selection of an appropriate injection rate was the key for controlling injection pressure. It was found that the injection pressure increased in proportion with the injection rate, decreased with increases in the size of the cracks, and decreased with increases in base substrate permeability. These results showed that the optimal injection rate for starch systems was 0.2 mL/min. In crack simulation experiments using rock cores, the sweep volume of a gaseous body was significantly affected by cracks in the reservoir, as the recovery rate falls below 1% for differentials larger than 1 000. The composition of the optimal high-strength gel system was:4% starch + 4% monomer + 0.05% crosslinking agent + 0.18% antigumming agent. This gel system has high strength, a gelling time between 8 and 20 h, and stable performance; hence, it is capable of sealing cracks effectively. The recovery rate reached 19% after crack sealing was performed using this gel, thus demonstrating that this gel system effectively increased the sweep volume of CO₂ flooding.

Key words: low-permeability oil reserves, injection pressure, CO₂ flooding, breakthrough velocity, recovery rate, starch system

CLC Number:

TE348

SHI Lihua, DANG Hailong, KANG Shengsong, WANG Weibo, WANG Qiang. Effects of Injection Pressure on Gas Channeling during CO₂ Flooding and a Study on Sealing of Cracks[J]. 西南石油大学学报(自然科学版), 2018, 40(1): 149-156.

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Effects of Injection Pressure on Gas Channeling during CO₂ Flooding and a Study on Sealing of Cracks

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