×

Surface controlled formation isolation valve adapted for deployment of a desired length of a tool string in a wellbore

  • US 6,085,845 A
  • Filed: 12/10/1996
  • Issued: 07/11/2000
  • Est. Priority Date: 01/24/1996
  • Status: Expired due to Term
First Claim
Patent Images

1. An apparatus for building a desired length of tool string for downhole operations in a wellbore, comprising:

  • a valve disposed between an upper section and a lower section of the wellbore, the valve adapted to move between a closed position to allow the tool string to be built in the upper section of the wellbore and an open position to allow the tool string to be lowered from the upper section of the wellbore through the valve to the lower section of the wellbore; and

    a controller for opening and closing the valve comprising;

    a valve manifold;

    a gas reservoir; and

    a flowline interconnecting the valve manifold and the gas reservoir to the valve.

View all claims
  • 2 Assignments
Timeline View
Assignment View
    ×
    ×