Method of completing wells in which the lower tubing is suspended from a tubing hanger below the wellhead and upper removable tubing extends between the wellhead and tubing hanger

Patent · Tue Feb 19 00:00:00 EST 1980

OSTI ID:5707370

James, H J; Young, C R

A method of and apparatus are disclosed for treating or completing wells to provide surface controlled subsurface safety systems in the wells , whether at the time of original completion or when the well is reworked or reequipped. A method and apparatus is provided for installing receptacles at the upper ends of one or more lower well flow conductors left in place in the well below the surface for receiving the lower ends of corresponding upper flow conductor sections having surface controlled subsurface safety valves connected therein for controlling undesired flow from the well through said lower flow conductors in the event of an emergency, disaster or accident damaging the surface flow controlling system or threatening the integrity thereof. A hanger or packer may be installed in the well casing below the surface for supporting the upper ends of the lower flow conductor or conductors therebelow and providing means for connecting receptacles at the upper ends of said lower flow conductors above such hanger or packer. The upper flow conductors having the flow controlling safety valves mounted therein may then be installed in the well in flow communication with the receptacles and the tubing strings or flow conductors therebelow. The upper flow conductor sections may have concentric or laterally offset parallel flow control fluid conduits communicating therewith for controlling actuation of the safety valves from the surface of the well. Also, conductor line means is provided for conducting fluids from above the hanger or packer at the upper end of the lower flow conductor to the annulus in the well casing therebelow for gas lift or for injection into the well producing formation, as desired. Check valve means is provided for controlling backflow through such conductor means from below the hanger or packer to the annulus in the well casing thereabove.

• Assignee: Otis Engineering Corp
• Patent Number(s): US 4189003
• OSTI ID: 5707370
• Resource Relation: Patent File Date: Filed date 21 Jan 1974; Other Information: PAT-APPL-435289
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
03 NATURAL GAS
OIL WELLS
SAFETY ENGINEERING
WELL COMPLETION
EQUIPMENT
CONTROL EQUIPMENT
FLUID FLOW
PACKINGS
PIPES
VALVES
WELL STIMULATION
WELLHEADS
ENGINEERING
FLOW REGULATORS
STIMULATION
WELLS
020300* - Petroleum- Drilling & Production
030300 - Natural Gas- Drilling
Production
& Processing