Patents by Inventor Zhenping XU

Zhenping XU 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).

  • Method for detecting formation resistivity outside of metal casing using time-domain electromagnetic pulse in well
    Patent number: 8756017
    Abstract: A method for detecting formation resistivity outside of metal casing using time-domain electromagnetic pulse in a borehole, the method including steps of a) providing a borehole large power pulse transmitting source, recording an induced electromotive force ?, and full time digital recording a transmitted waveform and a received signal; b) conducting transmission-reception and superimposing received signals to improve signal to noise ratio; c) calculating corresponding casing response according to known casing parameters and recorded current waveform of the transmitting source to obtain a relative induced electromotive force ??f; d) correcting relative induced electromotive force value; e) carrying out one-dimensional inversion and converting the observation signal into radial variation information of the formation resistivity; f) obtaining a two-dimensional image of the longitudinal and radial resistivity distribution of outer cased formation resistivity for measured well sections; and g) determining residua
    Type: Grant
    Filed: July 8, 2011
    Date of Patent: June 17, 2014
    Assignee: Yangtze University
    Inventors: Wenbao Hu, Liangjun Yan, Junmin Wang, Zhenping Xu, Mingzhang Luo, Zhuliu Su, Xingong Tang, Diren Liu, Qingli Chen, Xingbing Xie, Kui Xiang, Yurong Mao
  • METHOD FOR DETECTING FORMATION RESISTIVITY OUTSIDE OF METAL CASING USING TIME-DOMAIN ELECTROMAGNETIC PULSE IN WELL
    Publication number: 20120215448
    Abstract: A method for detecting formation resistivity outside of metal casing using time-domain electromagnetic pulse in a borehole, the method including steps of a) providing a borehole large power pulse transmitting source, recording an induced electromotive force ?, and full time digital recording a transmitted waveform and a received signal; b) conducting transmission-reception and superimposing received signals to improve signal to noise ratio; c) calculating corresponding casing response according to known casing parameters and recorded current waveform of the transmitting source to obtain a relative induced electromotive force ??f; d) correcting relative induced electromotive force value; e) carrying out one-dimensional inversion and converting the observation signal into radial variation information of the formation resistivity; f) obtaining a two-dimensional image of the longitudinal and radial resistivity distribution of outer cased formation resistivity for measured well sections; and g) determining residua
    Type: Application
    Filed: July 8, 2011
    Publication date: August 23, 2012
    Inventors: Wenbao HU, Liangjun YAN, Junmin WANG, Zhenping XU, Mingzhang LUO, Zhuliu SU, Xingong TANG, Diren LIU, Qingli CHEN, Xingbing XIE, Kui XIANG, Yurong MAO