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US 2019/0376364 A1Published application
Hydrostatic Equalizing Stem Check Valve
AssigneeHalliburton Energy Services, Inc.
InventorsThomas Murphy, Peter DW Inglis
Life of this patent
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Abstract
A pressure-activated device is inserted in a string for insertion into a borehole. The pressure-activated device has an indexing mechanism. The pressure-activated device has a piloted check valve that prevents the indexing mechanism from operating unless a pressure on an outside diameter of the pressure-activated device exceeds an activation threshold.
Claims17
An apparatus comprising:
- a piston chamber;
- a piston moveable within the piston chamber, the piston having a cylinder head and a pilot rod extending from the cylinder head;
- a check valve having:
- an open position in which fluid flow is permitted from a permanent fluid communication path to an equalizing fluid communication path and is permitted from the equalizing fluid communication path to the permanent fluid communication path, and
- a closed position in which fluid flow through the equalizing fluid communication path is permitted from the permanent fluid communication path to the equalizing fluid communication path and is not permitted from the equalizing fluid communication path to the permanent fluid communication path;
- a valve spring urging the check valve into the closed position;
- a piston spring urging the pilot rod of the piston into engagement with the check valve to urge the check valve into the open position;
- a gland surrounding pilot rod;
- an equalizing chamber between the cylinder head of the piston and the gland;
- and
- a hydrostatic fluid communication path between the equalizing chamber and a source of hydrostatic pressure.
8 more elements
An apparatus comprising:
- a tubular housing having an inside diameter and an outside diameter;
- a low pressure chamber in the tubular housing between the inside diameter and the outside diameter;
- a permanent fluid communication path fluidly coupled to the low pressure chamber;
- a high pressure chamber in the tubular housing between the inside diameter and the outside diameter;
- a bleed valve between the high pressure chamber and the low pressure chamber;
- an equalizing fluid communication path between the low pressure chamber and the high pressure chamber;
- an indexing mechanism capable of indexing in the presence of a difference between a pressure in the low pressure chamber and a pressure in the high pressure chamber;
- and
- a piloted check valve fluidly coupled to the outside diameter of the tubular housing and operable to close when a fluid pressure at the outside diameter of the tubular housing exceeds an activation pressure, the piloted check valve located to interrupt the equalizing fluid communication path upon closing.
6 more elements
A method comprising:
- including in a string for insertion into a borehole a pressure-activated device having:
- an indexing mechanism, and
- a piloted check valve that prevents the indexing mechanism from operating unless a pressure on an outside diameter of the pressure-activated device exceeds an activation threshold.
Dependencies are inferred from the claim text.