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Hydraulic-fluid-supply-apparatus-and-method-for-a-downhole-tool

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Hydraulic fluid supply apparatus and method for a downhole tool

Details

Inventors: Barrington, Burchus Q.;
Assignee: Halliburton Company (Duncan, OK)
Primary Examiner: Pate, III; William F.
Assistant Examiner:
Attorney, Agent or Firm: Beavers; Lucian Wayne, Walkowski; Joseph A., Weaver; Thomas R.

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.

DETAILED DESCRIPTION What is claimed is: 1.
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.
2.
The apparatus of claim 1, further comprising: an outer tubular member; and an inner tubular member disposed within said outer tubular member; wherein said floating piston means is annular in shape and is disposed between said outer and inner tubular members; wherein said first zone is partially defined by said outer and inner tubular members and a first side of said floating piston means; and wherein said second zone is partially defined by said outer and inner tubular members and a second side of said floating piston means.
3.
The apparatus of claim 2, wherein: said floating piston means includes radially outer and inner seals sealingly engaging said outer and inner tubular members, respectively.
4.
The apparatus of claim 1, further comprising: a dump chamber for receiving hydraulic fluid from a low pressure side of said hydraulically powered component of said downhole tool.
5.
The apparatus of claim 4, wherein: said control valve means is further characterized as including a means for directing hydraulic fluid from said low pressure side of said hydraulically powered component to said dump chamber.
6.
The apparatus of claim 1 in combination with said downhole tool, wherein: said downhole tool includes a subsea test tree; and said hydraulically powered component of said downhole tool includes a hydraulically powered closure valve means for selectively opening and closing a passageway of said subsea test tree

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