Well bore apparatus with annulus pressure releasable tubing seal unit

Patent · Tue Feb 12 04:00:00 EST 1980

OSTI ID:5825580

Kovacs, J P

Well bore apparatus is installed in a well casing on a tubular string having a packer anchored in and forming a seal within the casing. In the tubing string above the packer is a safety valve structure held open by the pressure of fluid supplied through control fluid tubing extending to the top of the well between the exterior of the tubing string and the casing. A long tubing seal structure has a lock releasable by the pressure of fluid supplied through the annulus, or alternatively by rotation of the tubing in an emergency. The tubing seal structure is released to enable the tubing string to move freely in either direction, in response to pressure and/or temperature changes, whereby tension and compression reversals are eliminated. The tubing string above the sealing receptacle can be pulled from above the packer and other downhole structures. The hydraulic release is operable by annulus pressure to release the receptacle for longitudinal movement relative to a long sealing slick joint after testing of the packer.

• Assignee: Baker International Corp
• Patent Number(s): US 4187906
• OSTI ID: 5825580
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
CONTROL EQUIPMENT
ENGINEERING
EQUIPMENT
FLOW REGULATORS
FLUID FLOW
NATURAL GAS WELLS
OIL WELLS
PACKINGS
RESERVOIR PRESSURE
SAFETY ENGINEERING
SEALS
TUBES
VALVES
WELL CASINGS
WELL PRESSURE
WELLS