Self powered downhole tool anchor

Patent · Tue Feb 07 04:00:00 EST 1984

OSTI ID:6928003

Hyland, C R

A self powered downhole tool anchor device is disclosed. It is preattached to a downhole tool (T) and unitarily supported by a drill string (DS) for a single trip into a well bore, actuated by forceful engagement with the bottom or plug (P) in the well bore and attachment to a well bore casing (C). The anchor device comprises an inner mandrel and lower cone containing a piston and fluid (F) for axially displacing an outer mandrel and piston connected thereto by shear screws. An upper cone on the outer mandrel is connected by shear pins to a slip housing containing radially expandable slips keyed to the lower cone. A self contained power supply (PS) of combustible material (M) is ignited by a firing pin striking a primer igniter (I) and generates gas pressure applied to the piston 30 and fluid (F) to shear pin and axially displace the outer mandrel and piston upper cone slip housing slips and ratchet ring relative to inner mandrel and cone. Screws are then sheared off releasing upper cone from slip housing and allowing relative displacement therebetween to radially expand slips into gripping engagement with the well bore casing (C). A mechanical firing mechanism includes a preloaded compressed spring actuated hammer retained against a spring housing and in a cocked firing position by a shear pin extending from an outer housing. A trigger engaged by the spring housing has a foot which engages the bottom of or plug (P) in the well bore. Lowering of a predetermined amount of weight of the assembled unit causes pin to shear and release the hammer which strikes and propels the firing pin into the igniter capsule I.

• Assignee: Christensen, Inc.
• Patent Number(s): US 4429741
• OSTI ID: 6928003
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
ACTUATORS
BOREHOLES
CAVITIES
DESIGN
DRILL PIPES
DRILLING EQUIPMENT
EQUIPMENT
EXPANSION
FASTENERS
HYDRAULIC EQUIPMENT
JOINTS
MACHINE PARTS
MECHANICAL STRUCTURES
PIPES
PISTONS
PRESSURIZING
SPRINGS
SUPPORTS
THREADED JOINTS
TOOLS
WELL SERVICING