Wells – Expansible anchor or casing
Patent
1993-04-16
1994-05-03
Bui, Thuy M.
Wells
Expansible anchor or casing
E21B 2300
Patent
active
053078730
ABSTRACT:
A removable lock for installation in a water well having a plastic casing includes a cylindrical body that fits loosely within the plastic casing. The body includes pivotable blades having points that are directed downwardly and outwardly. After the lock has been lowered a substantial distance below the ground into the casing, the blades are forcibly pivoted so that the points of the blades penetrate into the plastic coating. After the lock is thus set, the application of a downward force to the body of the lock will cause the point of the blades to dig deeper into the plastic casing so that the blades cut a slit in the plastic casing if an attempt is made to drive the body downward within the casing. A coupling is included at the top end of the body, and the coupling is engaged to the lower end of a pipe string for moving the lock into the casing and for removing it. To prevent unauthorized removal of the plug, the coupling at the top end of the body is provided with threads of an uncommon type.
REFERENCES:
patent: 3112794 (1963-12-01), Chenoweth
patent: 4058162 (1977-11-01), Smith
patent: 4116274 (1978-09-01), Rankin et al.
patent: 4610309 (1986-09-01), O'Brien et al.
patent: 4796723 (1989-01-01), Lauren et al.
Bui Thuy M.
McKown Daniel C.
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