Well tool locking apparatus

Patent · Tue Dec 10 04:00:00 EST 1985

OSTI ID:5913277

Bogard, E L

A clamping apparatus for locking tools in a well is disclosed. A first piston sealably engages a hollow body member to form a chamber, which is filled with a working fluid. A bias member or spring moves the first piston, extending a clamping arm connected to the first piston against the well wall. A second piston is sealably engaged in a bore in the first piston; the bore is in fluid communication with the chamber. The second piston is driven into the bore by a motor, increasing the pressure in the chamber through a passage in the first piston between the bore and the chamber. This increased pressure further urges the first piston and locks the clamping arm against the well wall. The hydraulic pressure is released, and the clamping arm is unlocked, by opening a valve in a line between the chamber and a reservoir. The clamping arm is retracted by driving the second piston into the bore into contact with the first piston, forcing the first piston back against the spring.

• Assignee: Geosource Inc.
• Patent Number(s): US 4557326
• OSTI ID: 5913277
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020200* -- Petroleum-- Reserves
Geology
& Exploration
03 NATURAL GAS
030200 -- Natural Gas-- Reserves
Geology
& Exploration
440400 -- Well Logging Instrumentation
47 OTHER INSTRUMENTATION
DESIGN
EMPLACEMENT
EQUIPMENT
HYDRAULIC EQUIPMENT
NATURAL GAS WELLS
OIL WELLS
OPERATION
PISTONS
RESTRAINTS
WELL LOGGING
WELL LOGGING EQUIPMENT
WELLS