Patents by Inventor Joe B. Welch

Joe B. Welch 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).

  • Downhole injection system
    Patent number: 6880639
    Abstract: A system for the downhole injection of chemical into a well through capillary tubing using a surface chemical pump includes downhole injection valve. The downhole injection valve includes an upstream and a downstream check valve connected in series. The upstream check valve has an adjustable spring bias. The amount of bias is dependent on the nature of the well and the system for inserting chemical through the capillary tube into the well. The lower check valve has a fixed bias and protects the injection valve from the unwanted backflow of gas, fluids or solids.
    Type: Grant
    Filed: July 16, 2003
    Date of Patent: April 19, 2005
    Assignee: RW Capillary Tubing Accessories, L.L.C.
    Inventors: R. David Rhodes, Joe B. Welch
  • Downhole injection system
    Publication number: 20040040718
    Abstract: A system for the downhole injection of chemical into a well through capillary tubing using a surface chemical pump includes downhole injection valve. The downhole injection valve includes an upstream and a downstream check valve connected in series. The upstream check valve has an adjustable spring bias. The amount of bias is dependent on the nature of the well and the system for inserting chemical through the capillary tube into the well. The lower check valve has a fixed bias and protects the injection valve from the unwanted backflow of gas, fluids or solids.
    Type: Application
    Filed: July 16, 2003
    Publication date: March 4, 2004
    Inventors: R. David Rhodes, Joe B. Welch