Petroleum Reservoir Evaluation and Development >
2020 , Vol. 10 >Issue 3: 92 - 95
DOI: https://doi.org/10.13809/j.cnki.cn32-1825/te.2020.03.014
Performance evaluation on CO2 flooding gas-soluble foaming agent in Caoshe Oilfield
Received date: 2019-01-22
Online published: 2020-07-03
In order to effectively solve the CO2 flooding gas channeling in Caoshe Oilfield, two kinds of gas-soluble foaming agents, fluorine-containing foaming agent（agent A） and silicon-containing foaming agent（agent B）, are evaluated from three aspects: dissolution, foaming and plugging, and one of them is selected as the CO2 flooding sealing system in Caoshe Oilfield. The optimal injection concentration is 1.5 %. According to the experimental results, the solubility of agent A and agent B in supercritical CO2 under the assistance of the co-solvent, ethanol, reach 2.51 % and 1.93 % respectively, and both of them can form the dissolution conditions of stable foam. The comprehensive performance of foam produced by agent B is better than that of agent A. When the concentration of agent B reaches 1.5 %, the foaming performance is the best. Under the condition of high temperature（110 ℃） and high pressure（15 MPa）, the foaming volume reaches 261 mL, and the half-life period reaches 115 min. From the aspects of dissolution and foaming, agent B is optimized as the foam sealing system of CO2 flooding in Caoshe Oilfield, and the evaluation experiments of CO2 foam sealing ability under different injection modes are carried out. When CO2 and foaming agent are injected alternately as the injection mode, the mixture is more uniform with more foam, and the resistance factor is high and can be more than 40, showing good foaming and plugging performance. The researches of sealing channeling system provide a new technical support for preventing gas channeling in CO2 flooding of Caoshe Oilfield.
Zhuang ZHANG , Haiyan WANG , Qian XU , Honglu ZHANG . Performance evaluation on CO2 flooding gas-soluble foaming agent in Caoshe Oilfield[J]. Petroleum Reservoir Evaluation and Development, 2020 , 10(3) : 92 -95 . DOI: 10.13809/j.cnki.cn32-1825/te.2020.03.014
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