Wells – Processes – Placing or shifting well part
Patent
1992-06-18
1993-08-31
Britts, Ramon S.
Wells
Processes
Placing or shifting well part
166 664, 166120, B21B 2306
Patent
active
052400778
ABSTRACT:
A setting tool for setting in a bore hole a downhole device such as plugs and packers is actuated by supplying a voltage signal to direct current motor that drives a hydraulic pump. The hydraulic pump delivers high pressure fluid to a setting chamber to displace a piston received therein. Relative movement of the piston to the chamber imparts a setting force to the downhole device with a shearing action between an outer setting sleeve and an internal mandrel. A hydraulic fluid reservoir is located on the backside of the setting piston, such that displacement of the setting piston during setting forces fluid toward the pump. An accumulator located between the reservoir and the pump accommodates thermal expansion of the fluid. A relief valve at the outlet of the pump provides back pressure to ensure that a minimum positive pressure is maintained at the intake of the pump. A second setting stage provides additional setting force. Controlling the voltage level of the signal to the motor permits control over the setting tool's stroke and actuation rate to permit fine control over setting.
REFERENCES:
patent: 3903965 (1975-09-01), Ahlstone
patent: 4350205 (1982-09-01), Goldschild et al.
patent: 4493374 (1985-01-01), Magee, Jr.
patent: 4545433 (1985-10-01), Wambaugh
patent: 4554973 (1985-11-01), Shonrock et al.
patent: 4856582 (1989-08-01), Smith et al.
patent: 5137086 (1992-08-01), Stokley et al.
Britts Ramon S.
Dresser Industries Inc.
Tsay Frank S.
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