Hydraulic fluid supply apparatus and method for a downhole tool
AssigneeHalliburton Company
InventorBurchus Q. Barrington
Life of this patent
Estimating the term…
Abstract
A hydraulic fluid supply apparatus for a downhole tool includes a first annular zone adapted to be filled with hydraulic oil and a second annular zone adapted to be filled with a pressurized second fluid. The first and second zones are separated by a floating annular piston for transmitting fluid pressure from the second zone to the first zone. A control valve is connected between the first zone and a hydraulically powered component of the downhole tool for directing hydraulic fluid under pressure from the first zone to the hydraulically powered component of the downhole tool.
Claims17
A hydraulic fluid supply apparatus for a downhole tool, comprising:
- a first zone adapted to be filled with hydraulic fluid;
- a second zone adapted to be filled with a pressurized second fluid, said second zone being completely defined within a container means adapted to be placed downhole;
- floating piston means, separating said first and second zones, for transmitting pressure from fluid in one of said zones to fluid in the other of said zones;
- and
- control valve means, connected between said first zone and a hydraulically powered component of said downhole tool, for directing hydraulic fluid under pressure from said first zone to said hydraulically powered component of said downhole tool.
A hydraulic fluid supply apparatus, comprising:
- an upper adapter;
- a lower adapter;
- an outer cylindrical tubular casing means having an upper end attached to said upper adapter and a lower end attached to said lower adapter;
- an inner cylindrical mandrel means concentrically disposed within said outer cylindrical tubular casing means and having upper and lower ends connected to said upper and lower adapters, respectively, said upper and lower adapters and an inner and an outer cylindrical surface of said casing and said mandrel, respectively, defining an annular cavity therebetween;
- a fixed annular divider means, connected between said inner and outer cylindrical surfaces of said casing and mandrel, respectively, and fixed to each of said casing and mandrel, for separating said annular cavity into first and second annular cavity portions;
- and
- a movable annular divider means, sealingly engaging said inner and outer cylindrical surfaces of said casing and mandrel, respectively, for separating said first annular cavity portion into first and second annular zones and for transmitting pressure from fluid in one of said zones to fluid in the other of said zones.
A method of supplying hydraulic fluid under pressure to a downhole tool, said method comprising the steps of:
- connecting to said downhole tool a hydraulic fluid supply apparatus having first and second zones, floating, piston means separating said first and second zones, and control valve means, connected between said first zone and a hydraulically powered component of said downhole tool, for directing hydraulic fluid under pressure from said first zone to said hydraulically powered component;
- filling said first zone with hydraulic fluid;
- filling said second zone with a pressurized second fluid;
- sealing and isolating said second fluid in said second zone thereby providing a self-contained fluid pressure source;
- transmitting pressure from said second fluid in said second zone to said hydraulic fluid in said first zone by means of said floating piston means;
- and
- moving said control valve means to a first position and thereby directing hydraulic fluid under pressure to said hydraulically powered component.
Dependencies are inferred from the claim text.