Laboratory Test Study of CO<sub>2</sub> Responsive Enhanced Foam System

LYU Wei; LIU Xiaochun; BAI Hailong; PENG Minglan

doi:10.11911/syztjs.2021119

Volume 49 Issue 5

Oct. 2021

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Petroleum Drilling Techniques > 2021 > 49(5): 88-93. > DOI: 10.11911/syztjs.2021119

LYU Wei, LIU Xiaochun, BAI Hailong, PENG Minglan. Laboratory Test Study of CO₂ Responsive Enhanced Foam System[J]. Petroleum Drilling Techniques, 2021, 49(5): 88-93. DOI: 10.11911/syztjs.2021119

Citation:

LYU Wei, LIU Xiaochun, BAI Hailong, PENG Minglan. Laboratory Test Study of CO₂ Responsive Enhanced Foam System[J]. Petroleum Drilling Techniques, 2021, 49(5): 88-93. DOI: 10.11911/syztjs.2021119

Citation:

LYU Wei, LIU Xiaochun, BAI Hailong, PENG Minglan. Laboratory Test Study of CO₂ Responsive Enhanced Foam System[J]. Petroleum Drilling Techniques, 2021, 49(5): 88-93. DOI: 10.11911/syztjs.2021119

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Laboratory Test Study of CO₂ Responsive Enhanced Foam System

1.
Oil and Gas Technology Research Institute, PetroChina Changqing Oilfield Company, Xi’an, Shaanxi, 710018, China
2.
Engineering Technology Management Department, PetroChina Changqing Oilfield Company, Xi’an, Shaanxi, 710018, China
3.
The No.2 Oil Production Plant, PetroChina Changqing Oilfield Company, Qingyang, Gansu, 745100, China

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Received Date: October 21, 2020
Revised Date: September 05, 2021
Available Online: September 16, 2021

Graphical Abstract

Abstract

Abstract

The development effect of CO₂ flooding in low permeability reservoirs is affected by the gas channeling. In response to this problem, the foam comprehensive value was used as the evaluation index to establish CO₂ responsive enhanced foam system by optimizing foaming agent with stirring method. The formula was 0.1% foaming agent AOS(alpha olefin sulfonate) adding 4.0% small molecule amine and water. Its viscosity, which was close to water viscosity before exposure to CO₂, increased by more than 18 times after reaction with CO₂. The results of performance evaluation indicated the foam comprehensive value of the proposed CO₂ responsive enhanced foam system could reach more than 11 times those of conventional foam systems, with obvious shear-thinning characteristics. The rheological equation conformed to the rheological model of power-law fluids. With stronger viscoelasticity than those of conventional foam systems, the proposed foam system could also be used to plug the dominant seepage channels to inhibit the gas channeling during CO₂ flooding in heterogeneous low permeability reservoirs and ultimately to enhance the oil recovery in such reservoirs. The research results showed that the CO₂ responsive enhanced foam system could solve the problem of gas channeling and improve the development effect of CO₂ flooding in low permeability reservoirs.
- low permeability reservoir,
- CO₂ flooding,
- channeling,
- foam,
- enhanced oil recovery

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References

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