Patents Assigned to Dynamic Oil Tools Inc.
  • Patent number: 5732777
    Abstract: There is described a method and an improved apparatus for rotatably suspending a tubing string in a well bore, the apparatus comprising a tubular coupler connected to the uphole end of the tubing string, a tubing hanger disposed annularly about the coupler in fixed axial relationship, the coupler being rotatable relative to the hanger, a hanger bowl for supporting the hanger therein so that the tubing string connected to the coupler can be suspended in the well bore and a drive system operably connected to the coupler and extending through the hanger bowl which can be actuated to rotate the coupler and hence the tubing string attached thereto.
    Type: Grant
    Filed: December 28, 1995
    Date of Patent: March 31, 1998
    Assignee: Dynamic Oil Tools Inc.
    Inventors: Allan D. Grimshaw, Dwayne S. Norman
  • Patent number: 5642782
    Abstract: Described is a clutch for providing a rotatable connection between the downhole end of a tubing string and a tubing anchor comprising first and second tubular subs and a connector device between the tubular subs, the connector device initially preventing relative rotation between the tubular subs and thereafter permitting relative rotation.
    Type: Grant
    Filed: February 23, 1996
    Date of Patent: July 1, 1997
    Assignee: Dynamic Oil Tools Inc.
    Inventors: Allan D. Grimshaw, Dwayne S. Norman