Patents by Inventor Qiulian LONG

Qiulian LONG 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).

  • Cationic copolymer and use thereof in lost circulation additive
    Patent number: 10266617
    Abstract: A cationic copolymer represented by the following formula (I) has a viscosity average molecular weight in a range from 2 million to 10 million. In the cationic copolymer, the mole fractions of three structural units corresponding to three monomers are as follows: x being in a range from 0.01 to 20%, y being in a range from 0 to 15%, and z=1?x?y. When used in the construction of leaking stoppage in an oil well, a cationic chemical lost circulation additive prepared with the cationic copolymer is mixed with an anionic drilling fluid in a section of the wellbore where lost circulation occurs. Then neutral reaction and cross linking reaction occur, so that the viscosity of the resulting mixture rapidly increases to form a space grid structure. This blocks off the leakage path, and thus effects on efficient leaking stoppage in a short time period.
    Type: Grant
    Filed: October 25, 2013
    Date of Patent: April 23, 2019
    Assignees: CHINA PETROLEUM & CHEMICAL CORPORATION, CHINA PETROLEUM & CHEMICAL CORPORATION EXPLORATION & PRODUCTION RESEARCH INSTITUTE
    Inventors: Changming Su, Mengyun Zhao, Jianzheng Su, Rusheng Zhang, Qiulian Long, Suobing Zhang, Danian Zhang, Chenggang Zheng, Yusheng Ma
  • CATIONIC COPOLYMER AND USE THEREOF IN LOST CIRCULATION ADDITIVE
    Publication number: 20160200848
    Abstract: A cationic copolymer represented by the following formula (I) has a viscosity average molecular weight in a range from 2 million to 10 million. In the cationic copolymer, the mole fractions of three structural units corresponding to three monomers are as follows: x being in a range from 0.01 to 20%, y being in a range from 0 to 15%, and z=1?x?y. When used in the construction of leaking stoppage in an oil well, a cationic chemical lost circulation additive prepared with the cationic copolymer is mixed with an anionic drilling fluid in a section of the wellbore where lost circulation occurs. Then neutral reaction and cross linking reaction occur, so that the viscosity of the resulting mixture rapidly increases to form a space grid structure. This blocks off the leakage path, and thus effects on efficient leaking stoppage in a short time period.
    Type: Application
    Filed: October 25, 2013
    Publication date: July 14, 2016
    Applicants: CHINA PETROLEUM & CHEMICAL CORPORATION, CHINA PETROLEUM & CHEMICAL CORPORATION EXPLORATION & PRODUCTION RESEARCH INSTITUTE
    Inventors: Changming SU, Mengyun ZHAO, Jianzheng SU, Rusheng ZHANG, Qiulian LONG, Suobing ZHANG, Danian ZHANG, Chenggang ZHENG, Yusheng MA