Patents Assigned to Bull Dog Tool Inc.
  • Patent number: 5743336
    Abstract: In a down-hole well arrangement, an insert pump having a pump barrel is provided, the pump barrel having a top end and a bottom end. Tubing for the down-hole well is also provided, the tubing including one or more tubing members, a seating nipple, and a tubular member having a first end attached to the seating nipple and a second end. A pump-packing device is provided, the pump-packing device having a tubular body having a bottom end attached to the second end of the tubular member and a top end attached to one of the one or more tubing members. The pump-packing device includes one or more annular spacer members, the spacer members being disposed inside the tubular body and having a first inside diameter, and one or more annular flexible elements supported inside the tubular body by the spacer members and having a second inside diameter smaller than the first inside diameter, the second inside diameter being sufficiently large to permit the pump barrel to be removably inserted through the flexible elements.
    Type: Grant
    Filed: September 18, 1996
    Date of Patent: April 28, 1998
    Assignee: Bull Dog Tool, Inc.
    Inventor: Bob G. Davis
  • Patent number: 4493383
    Abstract: The present invention relates to a well clean out tool comprising an elongated body having first and second ends and being adapted to be received within a well borehole. The elongated body is comprised of a plurality of subs including a first sub at a lower portion of the body having a one way valve for permitting only upward flow of fluid. A second sub is arranged above the first sub for receiving and retaining fluid and debris passing through the first sub while a third sub is arranged above the second sub. The third sub includes a second valve for permitting flow only upwardly through the third sub. A fourth or pumping sub is arranged above the third sub with the fourth sub including an outlet for returning fluid to the borehole. The pump sub includes an elongated hollow piston reciprocatingly driven within a casing of the fourth sub.
    Type: Grant
    Filed: June 7, 1983
    Date of Patent: January 15, 1985
    Assignee: Bull Dog Tool Inc.
    Inventors: Robert M. Williams, Bob Davis