Patents by Inventor Andrew W. Vigor

Andrew W. Vigor 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).

  • Circulating valve apparatus and drill stem test method allowing selective fluid communication between an above packer annulus and a rathole
    Patent number: 5275241
    Abstract: A test string section for a well comprises a circulating valve (40) including a mandrel (60), a rupture disk (68), and a series of ports (56). The valve is arranged above a packer. A second port (50) is arranged on a pipe section (44) below the packer and a flow tube (52) extends through the internal bore (66). On rupturing the rupture disk, the port (56) is opened whereby mud can be pumped into a rathole via the port to kill the rathole while the seal of the packer against a wall of the wellbore is still intact and the packer remains in a set condition.
    Type: Grant
    Filed: December 1, 1992
    Date of Patent: January 4, 1994
    Assignee: Schlumberger Technology Corporation
    Inventors: Andrew W. Vigor, Adrian J. Stewart, Dinesh R. Patel