Patents Represented by Attorney, Agent or Law Firm Brigitte Jeffry Echols
  • Two stage downhole drilling fluid filter
    Patent number: 6715570
    Abstract: A two stage filter for drilling fluid using downhole tools filters solid materials from the drilling fluid and has a first, outer filter section and a second, inner filter section. A portion of the drilling fluid flowing through the first section is received by the second section, and passed on to the fluid using device of the tool. A flow area of the first filter section is greater than a flow area of the second filter section.
    Type: Grant
    Filed: September 17, 2002
    Date of Patent: April 6, 2004
    Assignee: Schumberger Technology Corporation
    Inventors: Geoff Downton, Christian Menger, Henry Phan