Removable Control Line Barrier
First Claim
1. An operating assembly for a borehole tool, comprising:
- a hydraulically actuated tool supported on a tubular string for placement at a predetermined depth;
a control line extending to an actuator for said tool, said actuator operating the tool with a predetermined pressure lower than hydrostatic pressure in said control line with said tool at said predetermined depth;
a barrier in said control line that when closed limits hydrostatic pressure on said actuator to below said predetermined pressure as said tool is delivered to said predetermined depth;
said barrier selectively defeated after said tool reaches said predetermined depth.
1 Assignment
0 Petitions
Accused Products
Abstract
A hydraulically operated downhole tool located at a depth where control line hydrostatic pressure would normally set the tool is temporarily isolated from hydrostatic pressure and changes thereto from well exposure or downhole operations until properly located. A removable barrier is placed in the control line to the tool at a height from the tool that limits the hydrostatic force exposed to the actuation mechanism for the tool. The preferred barrier is a rupture disc that is selectively broken with applied pressure from a remote location, typically the surface above the well. The mounting depth of the barrier can be varied to control the maximum hydrostatic pressure seen by the tool as it is advanced to the intended position.
11 Citations
18 Claims
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1. An operating assembly for a borehole tool, comprising:
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a hydraulically actuated tool supported on a tubular string for placement at a predetermined depth; a control line extending to an actuator for said tool, said actuator operating the tool with a predetermined pressure lower than hydrostatic pressure in said control line with said tool at said predetermined depth; a barrier in said control line that when closed limits hydrostatic pressure on said actuator to below said predetermined pressure as said tool is delivered to said predetermined depth; said barrier selectively defeated after said tool reaches said predetermined depth. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of operating a hydraulically actuated borehole tool using a control line, comprising;
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locating the tool at a predetermined depth where hydrostatic pressure in the control line exceeds the pressure in the control line needed for tool actuation; preventing tool actuation when moving the tool to said predetermined depth by locating a barrier in the control line to keep the hydrostatic pressure between the tool and the barrier below the needed actuation pressure for the tool; removing the barrier to actuate the tool. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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Specification