Patents by Inventor Liu CUI

Liu CUI 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 evaluating downhole working condition of a PDC bit
    Patent number: 11959375
    Abstract: A method for evaluating a downhole working condition of a PDC bit includes: performing an indoor test, including performing a drilling test in different full-sized cores by using the PDC bit with different degrees of abrasion and balling under condition of given WOB and rotational speed, to acquire change characteristics of a WOB, a rotational speed, a torque, a ROP and a bit vibration of the PDC bit in different time domains; improving and perfecting an existing prediction model and evaluation method for the downhole working condition through data obtained by the test to obtain the method; reading parameters of the WOB, the rotational speed, the torque and the ROP in real time during drilling; determining the downhole working condition of the PDC bit by using the method in the improving and perfecting.
    Type: Grant
    Filed: March 16, 2021
    Date of Patent: April 16, 2024
    Assignee: CNPC Engineering Technology R&D Company Limited
    Inventors: Guodong Ji, Haige Wang, Meng Cui, Zhao Meng, Qiang Wu, Li Liu, Jiawei Zhang, Changchang Chen, Liu Cui, Jing Yu
  • METHOD FOR DETECTING ABNORMAL DIRECT CURRENT VOLTAGE MEASUREMENT IN HIGH VOLTAGE FLEXIBLE DIRECT CURRENT TRANSMISSION SYSTEM
    Publication number: 20240097434
    Abstract: A method for detecting abnormal direct current voltage measurement in a modular multilevel converter high voltage direct current transmission system is provided. In the method, a valve group voltage at a detection pole is obtained, voltages at voltage measurement points at the detection pole are collected, and comparison and determination are performed based on the actual arrangement of the voltage measurement points, and then whether an abnormal measurement occurs at each of the voltage measurement points is determined.
    Type: Application
    Filed: May 18, 2022
    Publication date: March 21, 2024
    Applicant: ELECTRIC POWER RESEARCH INSTITUTE. CHINA SOUTHERN POWER GRID
    Inventors: Qinlei CHEN, Shuyong LI, Qi GUO, Libin HUANG, Xuehua LIN, Zhijiang LIU, Deyang CHEN, Chao LUO, Guanming ZENG, Mengjun LIAO, Lijun DENG, Liu CUI, Zhida HUANG, Haiping GUO, Tianyu GUO
  • METHOD FOR EVALUATING DOWNHOLE WORKING CONDITION OF A PDC BIT
    Publication number: 20210301643
    Abstract: A method for evaluating a downhole working condition of a PDC bit includes: performing an indoor test, including performing a drilling test in different full-sized cores by using the PDC bit with different degrees of abrasion and balling under condition of given WOB and rotational speed, to acquire change characteristics of a WOB, a rotational speed, a torque, a ROP and a bit vibration of the PDC bit in different time domains; improving and perfecting an existing prediction model and evaluation method for the downhole working condition through data obtained by the test to obtain the method; reading parameters of the WOB, the rotational speed, the torque and the ROP in real time during drilling; determining the downhole working condition of the PDC bit by using the method in the improving and perfecting.
    Type: Application
    Filed: March 16, 2021
    Publication date: September 30, 2021
    Inventors: Guodong JI, Haige WANG, Meng CUI, Zhao MENG, Qiang WU, Li LIU, Jiawei ZHANG, Changchang CHEN, Liu CUI, Jing YU