E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/44
E21B 43/12 (2006.01) E21B 33/129 (2006.01) E21B 34/10 (2006.01) E21B 43/14 (2006.01)
Patent
CA 1170982
ABSTRACT A well valve system for producing a well along a tubing string and a tubing-casing annulus including a tubing string having a well packer for sealing the annulus around the tubing, sleeve valves in the tubing above and below the packer for controlling communication between the annulus and the tubing, a tubing safety valve and a separate annulus safety valve in the tubing controlling flow between the sleeve valves past the packer along an annular flow passage independent of the tubing string bore. The tubing and annulus safety valves are removeable. The sliding sleeve valves are opened when the annulus safety valve is installed and closed when the annulus safety valve is removed. The sleeve valves include a shutter for protecting the valve seals during opening and closing. The annulus safety valve includes a housing having fixed seals engaging the tubing wall above and below the sleeve valves, a valve tube assembly including an annular valve member in the housing, springs for closing the valve member, a hydraulic piston for opening the valve member, and annular flow passages along the housing and valve tube assembly past the valve member for conducting fluids from the lower sleeve valve past the packer to the upper sleeve valve. The annulus safety valve is held open by control fluid pressure, closed by spring force, and may be pumped open by fluid in the annulus above the valve. The only moving seals of the annulus safety valve are protected in- ternally.
390770
Otis Engineering Corporation
Riches Mckenzie & Herbert Llp
LandOfFree
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