Patents by Inventor Rushan Liu

Rushan Liu 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).

  • 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
  • Publication number: 20040180795
    Abstract: The present invention provides an electropositive and water-based production well treating fluid system. The production well treating fluid system can be made to exhibit electropositivity by using a cationic viscosifier meanwhile matched with a cationic fluid loss additive and optionally matched with a mud-building agent, electrical stabilizing agent, colloid-stabilizing agent, lubricant, oil layer protective agent and/or weighting agent. Such kind of electropositive production well treating fluid can solve better the contradiction between “treating fluid stability” and “bore hole stability”, and has features in strong ability of inhibiting the dispersion of clay, good effect of protecting oil-gas reservoir, fast drilling speed, regular shape of bore hole and good resistance to salt. The present invention relates further to a method of preparing said production well treating fluid system and use of the drilling fluid and well completion fluid in petroleum drilling and well completion.
    Type: Application
    Filed: November 21, 2003
    Publication date: September 16, 2004
    Inventors: Changming Su, Rushan Liu, Weiping Xu, Zengchen Guan, Peizhi Yu, Xiushan Liu, Juafen Li, Baoyu Guo, Yingchun Cui, Caixuan Guo, Jing Li