Blowout preventer ram lock
AssigneeHydril Company
InventorRichard A. Olson
Life of this patent
Estimating the term…
Abstract
A new and improved ram lock for blowout preventer rams which permits locking of the ram at multiple and adjustable positions to compensate for wear on sealing elements of blowout preventer rams and increase sealing action of the ram without requiring separate special control lines. Automatic locking of the ram at a desired position, such as in adjustable sealing positions to compensate for ram elastomer wear, is obtained.
Claims40
In a blowout preventer having at least one blowout preventer ram movable therein to adjustable closed positions for sealing contact with a well pipe or the like in a bore of the blowout preventer, a ram lock for locking the ram at the adjustable closed positions, comprising:
- (a) ram carrier means comprising a ram piston having a piston rod with a threaded surface formed thereon for moving the ram to the adjustable closed positions in the blowout preventer;
- (b) lock means for locking said ram carrier means at adjustable closed positions, comprising:
- (1) a lock nut having a threaded surface formed thereon and engaged by said threaded surface on said ram piston rod for rotational movement with respect thereto during movement of the ram;
- (2) a movable clutch plate mounted with said lock nut for rotational movement therewith, said movable clutch plate having ratchet teeth formed thereon;
- (3) a fixed clutch plate having ratchet teeth formed thereon;
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- (4) means mounting said fixed clutch plate with the blowout preventer against relative movement with respect thereto;
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- (c) means for moving said ratchet teeth of said fixed clutch plate and said movable clutch plate into engagement to lock said ram carrier means against outward movement as the ram is moving inwardly.
In a blowout preventer, a ram lock for automatically locking the ram against reverse or outward movement during inward movement to a closed position for contact of the ram with a well pipe or the like in a bore of the preventer, comprising:
- (a) ram carrier means comprising a ram piston having a piston rod with a threaded surface formed thereon for moving the ram to and from the adjustable closed position;
- (b) lock means for locking said ram carrier means against outward movement as the ram is moving inwardly, said lock means comprising:
- (1) a lock nut having a threaded surface formed thereon and engaged by said threaded surface on said ram piston rod for rotational movement with respect thereto during movement of the ram;
- (2) a movable clutch plate mounted with said lock nut for rotational movement therewith, said movable clutch plate having ratchet teeth formed thereon;
- (3) a fixed clutch plate having ratchet teeth formed thereon;
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- (4) means mounting said fixed clutch plate with the blowout preventer against relative movement with respect thereto;
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- (c) means for moving said ratchet teeth of said fixed clutch plate and said movable clutch plate into engagement to lock said ram carrier means against outward movement as the ram is moving inwardly.
A ram lock for a blowout preventer ram for locking the ram at an adjustable closed position for sealing contact with a well pipe or the like in the blowout preventer, comprising:
- (a) ram carrier means comprising a ram piston having a piston rod with a threaded surface formed thereon for moving the ram to the adjustable closed positions in the blowout preventer;
- (b) lock means for locking said ram carrier means at adjustable closed positions, comprising:
- (1) a lock nut having a threaded surface formed thereon and engaged by said threaded surface on said ram piston rod for rotational movement with respect thereto during movement of the ram;
- (2) a movable clutch plate mounted with said lock nut for rotational movement therewith, said movable clutch plate having ratchet teeth formed thereon;
- (3) a fixed clutch plate having ratchet teeth formed thereon;
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- (4) means mounting said fixed clutch plate with the blowout preventer against relative movement with respect thereto;
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- (c) means for moving said ratchet teeth of said fixed clutch plate and said movable clutch plate into engagement to lock said ram carrier means against outward movement as the ram is moving inwardly.
A ram lock for a blowout preventer ram for automatically locking the ram against reverse or outward movement, during inward movement to a closed position for contact of the ram with a well pipe or the like in a bore of a blowout preventer, comprising:
- (a) ram carrier means comprising a ram piston having a piston rod with a threaded surface formed thereon for moving the ram to and from the adjustable closed position;
- (b) lock means for locking said ram carrier means against outward movement as the ram is moving inwardly, said lock means comprising:
- (1) a lock nut having a threaded surface formed thereon and engaged by said threaded surface on said ram piston rod for rotational movement with respect thereto during movement of the ram;
- (2) a lock nut clutch plate mounted with said lock nut for rotational movement therewith, said lock nut clutch plate having ratchet teeth formed thereon;
- (3) a fixed clutch plate having ratchet teeth formed thereon;
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- (4) means mounting said fixed clutch plate with the blowout preventer against relative movement with respect thereto;
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- (c) means for moving said ratchet teeth of said movable clutch plate and said fixed clutch plate into engagement and resisting relative movement therebetween in response to the closing fluid pressure.
Dependencies are inferred from the claim text.