The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 13, 2026
Filed:
Jun. 27, 2023
China Petroleum & Chemical Corporation, Beijing, CN;
Sinopec (Shanghai) Research Institute of Petrochemical Technology Co., Ltd., Shanghai, CN;
Xiujuan He, Shanghai, CN;
Yingcheng Li, Shanghai, CN;
Jun Qiu, Shanghai, CN;
Leyu Cui, Shanghai, CN;
CHINA PETROLEUM & CHEMICAL CORPORATION, Beijing, CN;
SINOPEC (SHANGHAI) RESEARCH INSTITUTE OF PETROCHEMICAL TECHNOLOGY CO., LTD., Shanghai, CN;
Abstract
A viscoelastic foam system for an acidic gas switch improves the recovery factor. The viscoelastic foam system for an acidic gas switch has a pH-switch surfactant, a hydrocarbyl anionic surfactant and water. The pH-switch surfactant is at least one of long-chain hydrocarbyl amines. After the viscoelastic foam system meets the acidic gas, the interaction between the pH-switch surfactant and the hydrocarbyl anionic surfactant is enhanced, the viscosity increases, and the formed foam has better stability and plugging performance. When the viscoelastic foam system is injected at 1.0 PV, the apparent viscosity of the foam formed in the rock core is ≥270 mPa·s, which can increase the recovery factor by more than 20%, and the long-chain hydrocarbyl amine improves the salt tolerance of the single anionic surfactant, so that the applicable mineralization range of the system is increased to 10-200 g/L.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile