James A Renfroe

US Patent:

46243100, Nov 25, 1986

Filed:

May 20, 1985

Appl. No.:

6/736232

Inventors:

Ralph H. Echols - Carrollton TX
Bhanubhai H. Patel - Grand Prairie TX
James B. Renfroe - Valencia CA

Assignee:

Otis Engineering Corporation - Carrollton TX

International Classification:

E21B 4312
E21B 3410

US Classification:

166106

Abstract:

A well system employs a pump to lift liquid through a primary tubing and subsurface safety valve. The tubing passes through a packer and a vent valve vents gas from the well through the packer. The power transfer means may extend through the vent valve and the vent valve may also control a cross-over in the packer for recirculation of liquid to the pump when the well is shut-in. The vent valve has associated therewith a kill valve permitting pumping of kill fluid into the well. The vent remains closed in the presence of ambient pressure up to a selected value and above this value the kill valve opens thus permitting testing of the packer with annulus pressure below the selected pressure and pump through to kill the well with pressure above the selected pressure.