Patents Assigned to Sans. Gas. Inc.
  • Method to prevent gas intrusion into wellbores during setting of cements
    Patent number: 5020594
    Abstract: A method of cementing wells to minimize gas intrusion by applying pressures on the subsurface formations substantially equal to the natural formation pressures.
    Type: Grant
    Filed: June 28, 1990
    Date of Patent: June 4, 1991
    Assignee: Sans. Gas. Inc.
    Inventor: James A. Gill