Casing hanger locking device

Patent · Tue Feb 10 04:00:00 EST 1987

OSTI ID:6904677

Wightman, W D

This patent describes a well assembly having a wellhead with a bore containing an internal landing shoulder formed therein and a plurality of internal grooves located above the shoulder, a casing hanger having a body adapted to be mounted to the top of a string of casing. An improved locking and supporting means is described for securing the casing hanger in the wellhead, comprising in combination: a collar slidably mounted to the exterior of the body, the collar protruding from the body for contacting the landing shoulder as the casing hanger is lowered into the wellhead. The collar is movable relative to the body from a lower storage position to an upper set position which occurs when the collar contacts the landing shoulder and the hanger body continues downward movement; and wedge means located between the collar and the body for allowing downward movement of the hanger body when the collar contacts the landing shoulder, but resisting upward movement of the hanger body relative to the collar.

• Assignee: Hughes Tool Co., Houston, TX
• Patent Number(s): US 4641708
• OSTI ID: 6904677
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
42 ENGINEERING
420206 -- Engineering-- Mining & Drilling Equipment & Facilities-- (1980-1989)
DRILL PIPES
DRILLING EQUIPMENT
EQUIPMENT
FASTENERS
HOISTING
HOISTS
MATERIALS HANDLING
MATERIALS HANDLING EQUIPMENT
NATURAL GAS WELLS
OIL WELLS
PIPES
POSITIONING
STORAGE
WELL CASINGS
WELLHEADS
WELLS