Hydraulically actuated lock pin for well pipe hanger

Patent · Tue Sep 13 04:00:00 EDT 1988

OSTI ID:6981264

Bridges, C D; Law, R K

This patent describes a wellhead having a bore containing a pipe hanger assembly, an improved means for securing the hanger assembly, comprising in combination: a lock pin extending through a passage provided in the wellhead, the lock pin having an inner end and being moveable to an inner position in which the inner end protrudes into the bore and engages the hanger assembly; a piston and cylinder adapted to be coupled to the wellhead in alignment with the lock pin; means for applying fluid pressure to the cylinder to move the piston nonrotatably and linearly inward for applying an inward force to the lock pin to move the lock pin without rotation to the inner position; and retainer means mounted to the wellhead, operable after the piston has moved the lock pin to the inner position, for securing the lock pin in the inner position while the lock pin is held in the inner position by the piston, for enabling the fluid pressure to be removed.

• Assignee: Vetco Gray, Inc., Houston, TX
• Patent Number(s): US 4770250
• OSTI ID: 6981264
• 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
423000 -- Engineering-- Marine Engineering-- (1980-)
DRILL PIPES
DRILLING
DRILLING EQUIPMENT
EQUIPMENT
FASTENERS
FLUID MECHANICS
HYDRAULIC EQUIPMENT
HYDRAULICS
MECHANICAL STRUCTURES
MECHANICS
NATURAL GAS WELLS
OFFSHORE DRILLING
OIL WELLS
PIPES
PISTONS
SUPPORTS
WELLHEADS
WELLS