Patents by Inventor Jiafen Li

Jiafen Li 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).

  • Copolymer and preparation method and application thereof
    Patent number: 8623791
    Abstract: A copolymer and preparation method and application thereof are disclosed. The copolymer is random copolymer obtained from monomers consisting of acrylamide, acrylic acid, alkenyl sulfonate, 2-acrylamido-dodecyl sulfonate, p-styrene sulfonate or isoprene sulfonate and so on. The copolymer of present invention can be used as fluid loss additive and has good fluid loss properties, which would not make the drilling fluid thicken at high temperature of 200° C. and high salt conditions of saturated brine. It has a medium-pressure fluid loss after aging and rolling for 16 h at high temperature of 200° C., as measured in accordance with the American Petroleum Institute Standard Test at room temperature, and has good properties of high temperature-resisting and salt-resisting.
    Type: Grant
    Filed: September 23, 2011
    Date of Patent: January 7, 2014
    Assignees: China Petroleum & Chemical Corporation, Sinopec Research Institute of Petroleum Engineering
    Inventors: Xiaohua Yang, Lin Wang, Jiafen Li, Xiaolin Qian, Xianguang Wang, Sheng Li, Liwei Ren, Changming Su, Zhifa Wang, Guichuan Liu, Bingzhong Shi
  • COPOLYMER AND PREPARATION METHOD AND APPLICATION THEREOF
    Publication number: 20120077718
    Abstract: A copolymer and preparation method and application thereof are disclosed. The copolymer is random copolymer obtained from monomers consisting of acrylamide, acrylic acid, alkenyl sulfonate, 2-acrylamido-dodecyl sulfonate, p-styrene sulfonate or isoprene sulfonate and so on. The copolymer of present invention can be used as fluid loss additive and has good fluid loss properties, which would not make the drilling fluid thicken at high temperature of 200° C. and high salt conditions of saturated brine. It has a medium-pressure fluid loss after aging and rolling for 16 h at high temperature of 200° C., as measured in accordance with the American Petroleum Institute Standard Test at room temperature, and has good properties of high temperature-resisting and salt-resisting.
    Type: Application
    Filed: September 23, 2011
    Publication date: March 29, 2012
    Applicants: SINOPEC RESEARCH INSTITUTE OF PETROLEUM ENGINEERING, China Petroleum & Chemical Corporation
    Inventors: Xiaohua YANG, Lin Wang, Jiafen Li, Xiaolin Qian, Xianguang Wang, Sheng Li, Liwei Ren, Changming Su, Zhifa Wang, Guichuan Liu, Bingzhong Shi
  • Electropositive production well treating fluid and method of preparing the same
    Patent number: 7323434
    Abstract: An electropositive and water-based production well treating fluid system exhibits electropositivity by using a cationic viscosifier meanwhile matched with a cationic fluid loss additive and, optionally, contains a mud-building agent, an electrical stabilizing agent, a colloid-stabilizing agent, lubricant, an oil layer protective agent and/or a weighting agent. The electropositive production well treating fluid can beffer solve the contradiction of technical requirements between “treating fluid stability” and “bore hole stability”, and features a strong ability to inhibit the dispersion of clay, a good effect of protecting oil-gas reservoirs, fast drilling speeds, regular shape of bore holes and good resistance to salt.
    Type: Grant
    Filed: November 21, 2003
    Date of Patent: January 29, 2008
    Assignees: China Petroleum & Chemical Corporation, Exploration & Production Research Insitute, SINOPEC, China Petro-Chemical Corporation Shengli Petroleum Administrative Bureau
    Inventors: Changming Su, Rushan Liu, Weiping Xu, Zengchen Guan, Peizhi Yu, Xiushan Liu, Jiafen Li, Baoyu Guo, Yingchun Cui, Caixuan Guo, Jing Li