Patents by Inventor Xiaoqiang Dong

Xiaoqiang Dong 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).

  • Maleamic acid monomer and preparation method and use thereof
    Patent number: 10538484
    Abstract: A maleamic acid monomer, and a preparation method and a use of the maleamic acid monomer. The structural formula of the monomer is as follows: formula (1), wherein, R is selected from The maleamic acid monomer provided in the present invention may be used as a comonomer to prepare temperature-tolerant and calcium salt-tolerant polymers.
    Type: Grant
    Filed: September 12, 2018
    Date of Patent: January 21, 2020
    Assignees: China Petroleum & Chemical Corporation, SINOPEC Research Institute of Petroleum Engineering
    Inventors: Xiaohua Yang, Yongxue Lin, Jian He, Lin Wang, Haibo Wang, Fan Yang, Zhoujun Li, Xiaoqiang Dong
  • Filtration control agent and a drilling fluid containing the same
    Patent number: 9243180
    Abstract: The present invention provides a filtration control agent and a drilling fluid containing the same. The filtration control agent comprises the product obtained from the reaction of water, lignite, aldehyde and sulfonate polymer at 180-220° C. and the units containing sulfonate groups in the molecular chains of sulfonate polymer are at least 30 wt %. The filtration control agent provided by the present invention features a good filtration loss reduction effect and a low viscosity effect and can improve the rheological behavior of the drilling fluid, thereby meeting the requirements of the drilling of deep wells, ultra-deep wells and ultra high pressure formations.
    Type: Grant
    Filed: September 26, 2012
    Date of Patent: January 26, 2016
    Assignees: China Petroleum & Chemical Corporation, SINOPEC Research Institute of Petroleum Engineering
    Inventors: Xiaohua Yang, Lin Wang, Yongxue Lin, Sheng Li, Long Chai, Xiaoqiang Dong