Pressure relief system and methods of use and making
AssigneeHalliburton Energy Services, Inc.
InventorMark P. Blackman
Life of this patent
Estimating the term…
Abstract
A roller-cone rock bit in which the compensation reservoir is integrated with a hydrostatically-asymmetric seal, such as a V-seal, which provides pressure relief. This seal not only relieves overpressure during filling, and when the grease thermally expands as the bit first goes downhole, but also compensates transient overpressures during operation.
Claims33
A bit for downhole rotary drilling, comprising:
- one or more rotary cutting elements, each rotatably mounted to bearings on a spindle;
- at least one pressure compensation reservoir fluidly connected to said bearings;
- and
- a pressure relief valve fluidly connected to relieve overpressure inside said reservoir, said pressure relief valve comprising a hydrostatically-asymmetric seal which allows fluid passage easily in only one direction.
A bit for downhole rotary drilling, comprising:
- one or more rotary cutting elements, each rotatably mounted to bearings on a spindle;
- at least one pressure compensation reservoir fluidly connected to said bearings;
- and
- a pressure relief valve fluidly connected to relieve overpressure inside said reservoir, said pressure relief valve comprising a hydrostatically-asymmetric seal;
- wherein said seal is more than half as wide as said diaphragm, and is axially separated from said diaphragm by less than half the width of said diaphragm.
A bit for downhole rotary drilling, comprising:
- one or more rotary cutting elements, each rotatably mounted to bearings on a spindle;
- at least one pressure compensation reservoir fluidly connected to said bearings;
- and
- a pressure relief valve fluidly connected to relieve overpressure inside said reservoir, said pressure relief valve consisting of a hydrostatically-asymmetric seal which is integral with said reservoir and which allows fluid passage easily in only one direction.
A bit for downhole rotary drilling, comprising:
- one or more rotary cutting elements, each rotatably mounted to bearings on a spindle;
- at least one pressure compensation reservoir fluidly connected to said bearings;
- and
- a pressure relief valve fluidly connected to relieve overpressure inside said reservoir, said pressure relief valve comprising a hydrostatically-asymmetric seal which is integral with said reservoir and which is oriented so that flow into said reservoir and bypass flow through said seal are in the same direction.
An elastomeric lubricant reservoir diaphragm having a hydrostatically-asymmetric seal integral therewith, at a lip thereof which surrounds a cavity, said seal allows fluid passage easily in only one direction;
- whereby said seal provides pressure relief for overpressures inside said cavity.
Dependencies are inferred from the claim text.