Leyu Cui

Title: Leyu Cui and His Patent on Acidic-Gas-Switchable Viscoelastic Foam

Introduction

Leyu Cui is an inventor associated with Shanghai, China. His patent work addresses enhanced recovery in oil reservoirs through a viscoelastic foam system that responds to acidic gas.

Latest Patents

Cui is associated with 1 patent, titled “Viscoelastic Foam System for Acidic Gas Switch, and Method and Use for Improving the Recovery Factor Using the Same.” The system combines water, a pH-switch surfactant made from one or more long-chain hydrocarbyl amines, and a hydrocarbyl anionic surfactant. When exposed to acidic gas, the interaction between the surfactants strengthens, increasing viscosity and producing foam with improved stability and plugging performance.

The patent describes a system that, when injected at 1.0 pore volume, forms foam in a rock core with an apparent viscosity of at least 270 mPa·s and can increase the recovery factor by more than 20%. The long-chain hydrocarbyl amine also improves the salt tolerance of the anionic surfactant, extending the system’s applicable mineralization range to 10–200 g/L.

Career Highlights

Cui’s listed company affiliations include China Petroleum & Chemical Corporation and Sinopec (Shanghai) Research Institute of Petrochemical Technology Co., Ltd. His patent reflects work on surfactant chemistry and foam-based methods for improving recovery in acidic-gas applications.

Collaborations

Cui’s listed coworkers include Xiujuan He and Yingcheng Li.

Conclusion

Leyu Cui’s patent presents an acidic-gas-responsive foam approach designed to improve foam stability, plugging performance, salt tolerance, and recovery factor.