Patents by Inventor Zhennan Zhang

Zhennan Zhang 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).

  • Subsea wellhead pressure indicating and automatic adjusting device for deep-water dual-gradient drilling
    Patent number: 9605499
    Abstract: The present invention relates to deep-water drilling in petroleum engineering and, in particular, to a subsea wellhead pressure indicating and automatic adjusting device for deep-water dual-gradient drilling, comprising a subsea drilling fluid manifold system and a subsea wellhead pressure indicating and automatic adjusting system, wherein the subsea drilling fluid manifold system provides a flow channel for the drilling fluid returning through the wellbore so that the drilling fluid can smoothly return to a drilling platform, and provides a basis for the subsea wellhead pressure indicating and automatic adjusting system; and wherein the subsea wellhead pressure indicating and automatic adjusting system can display and adjust the subsea wellhead pressure in real time, in order to keep the subsea wellhead pressure to be constantly equal to the hydrostatic pressure of the seawater at the seabed.
    Type: Grant
    Filed: September 7, 2016
    Date of Patent: March 28, 2017
    Assignee: China University of Petroleum (East China)
    Inventors: Baojiang Sun, Zhennan Zhang, Zhiyuan Wang, Ning Wang, Xuerui Wang, Guomin Yan, Yang Zhao