Patents by Inventor Shiyi Yuan

Shiyi Yuan has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Betaine surfactants and preparation methods and uses thereof
    Patent number: 9540559
    Abstract: Betaine surfactants of formula (I) and preparation methods and uses thereof are provided. The surfactant can decrease the interfacial surface tension of crude oil till 10?3 mN/m, have the capabilities of antiheating (130° C.), antimineralizing and antidiluting, and can be used in the field of tertiary oil recovery.
    Type: Grant
    Filed: March 11, 2011
    Date of Patent: January 10, 2017
    Assignee: PETROCHINA COMPANY LIMITED
    Inventors: Chunde Liu, Shiyi Yuan, Demin Wang, Xinmin Song
  • BETAINE SURFACTANTS AND PREPARATION METHODS AND USES THEREOF
    Publication number: 20140113842
    Abstract: Betaine surfactants of formula (I) and preparation methods and uses thereof are provided. The surfactant can decrease the interfacial surface tension of crude oil till 10?3 mN/m, have the capabilities of antiheating (130° C.), antimineralizing and antidiluting, and can be used in the field of tertiary oil recovery.
    Type: Application
    Filed: March 11, 2011
    Publication date: April 24, 2014
    Applicant: PetroChina Company Limited
    Inventors: Chunde Liu, Shiyi Yuan, Demin Wang, Xinmin Song
  • Braided comb-shaped salt-resistant polymer thickening agent
    Patent number: 7304116
    Abstract: A braided comb-shaped salt-resistant thickening agent for tertiary oil extraction from class I oil reservoir is disclosed. The agent is polymerized with monomer (A) and monomer (B), and monomer (A) is one or multiple water soluble non-saturated compound(s) with alkenyl chain, while monomer (B) is at least one compound with the following formula: Monomer (A) is preferably acrylamide, ethenyl pyrrolidone, 2-acrylamide-2 methylpropane sulfonic acid, and acrylic acid or the mixture of the above said compounds, and in the formula of monomer (B), A is COOH, OH, SO3H, R1 and R2 are H or C1-C12 alkyl, R3 and R4 represent C1-C12 alkyl, C1-C12 alkylaryl, C1-C12 alkyl ether or C1-C12 alkyl ester group. This thickening agent has fine water solubility and good property to thicken water medium. The polymer's molecules present a braided comb-shaped structure in water solution with fine salt-resistant performances.
    Type: Grant
    Filed: June 6, 2006
    Date of Patent: December 4, 2007
    Assignee: Petrochina Company Limited
    Inventors: Shiyi Yuan, Jianhui Luo, Ruoying Pu, Yuzhang Liu, Huaijiang Zhu, Pingmei Wang, Chunming Xiong, Ying Zhang, Fengluan Bai, Jingbo Yang
  • Braided comb-shaped salt-resistant polymer thickening agent
    Publication number: 20060287456
    Abstract: A braided comb-shaped salt-resistant thickening agent for tertiary oil extraction from class I oil reservoir is disclosed. The agent is polymerized with monomer (A) and monomer (B), and monomer (A) is one or multiple water soluble non-saturated compound(s) with alkenyl chain, while monomer (B) is at least one compound with the following formula: Monomer (A) is preferably acrylamide, ethenyl pyrrolidone, 2-acrylamide-2 methylpropane sulfonic acid, and acrylic acid or the mixture of the above said compounds, and in the formula of monomer (B), A is COOH, OH, SO3H, R1 and R2 are H or C1-C12 alkyl, R3 and R4 represent C1-C12 alkyl, C1-C12 alkylaryl, C1-C12 alkyl ether or C1-C12 alkyl ester group. This thickening agent has fine water solubility and good property to thicken water medium. The polymer's molecules present a braided comb-shaped structure in water solution with fine salt-resistant performances.
    Type: Application
    Filed: June 6, 2006
    Publication date: December 21, 2006
    Applicant: PetroChina Company Limited
    Inventors: Shiyi Yuan, Jianhui Luo, Ruoying Pu, Yuzhang Liu, Huaijiang Zhu, Pingmei Wang, Chunming Xiong, Ying Zhang, Fengluan Bai, Jingbo Yang