Patents by Inventor Daogang Cai

Daogang Cai 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).

  • Permanent packer and extended gas lift method using permanent packer
    Patent number: 11994011
    Abstract: The present invention discloses a permanent packer and an extended gas lift method using the permanent packer, the method comprising: S1. imbedding the extended gas lift embedded pipe when setting the permanent packer, wherein the extended gas lift embedded pipe has an upper end being closed and a lower end being open, is provided therein with a one-way valve through which the fluid can pass from top to bottom; S2. lowering a breaking device from the production casing when in the extended gas lift, to break the upper end of the extended gas lift embedded pipe such that the upper and lower ends of the extended gas lift embedded pipe are communicated; and S3. injecting gas into the production casing, lifting the accumulated liquid in the bottom hole to the ground surface, to complete the extended gas lift.
    Type: Grant
    Filed: September 16, 2020
    Date of Patent: May 28, 2024
    Assignees: PetroChina Company Limited, Sichuan Shengnuo Oil. and Gas Engineering Technology Service Co. Ltd
    Inventors: Weilin Wang, Huiyun Ma, Changqing Ye, Hao Tan, Hanbing Tang, Daogang Cai, Xueqiang Wang, Yukui Hong, Fengjing Sun, Wei Zhou, Ting Zhang, Zonghao Dong, Yan Huang, Yun Miao
  • PERMANENT PACKER AND EXTENDED GAS LIFT METHOD USING PERMANENT PACKER
    Publication number: 20220349282
    Abstract: The present invention discloses a permanent packer and an extended gas lift method using the permanent packer, the method comprising: S1. imbedding the extended gas lift embedded pipe when setting the permanent packer, wherein the extended gas lift embedded pipe has an upper end being closed and a lower end being open, is provided therein with a one-way valve through which the fluid can pass from top to bottom; S2. lowering a breaking device from the production casing when in the extended gas lift, to break the upper end of the extended gas lift embedded pipe such that the upper and lower ends of the extended gas lift embedded pipe are communicated; and S3. injecting gas into the production casing, lifting the accumulated liquid in the bottom hole to the ground surface, to complete the extended gas lift.
    Type: Application
    Filed: September 16, 2020
    Publication date: November 3, 2022
    Inventors: Weilin Wang, Huiyun Ma, Changqing Ye, Hao Tan, Hanbing Tang, Daogang Cai, Xueqiang Wang, Yukui Hong, Fengjing Sun, Wei Zhou, Ting Zhang, Zonghao Dong, Yan Huang, Yun Miao