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US 8,800,689 B2Granted
Floating plug pressure equalization in oilfield drill bits
AssigneeHalliburton Energy Services, Inc.
InventorMichael B. Crawford
Life of this patent
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Abstract
A drill bit of the type used to drill a wellbore in the earth can comprise a bore formed in the drill bit, and a plug sealingly and reciprocably disposed in the bore, whereby the plug prevents fluid communication between sections of the bore in the drill bit. The plug can comprise a spherically-shaped member. The plug can comprise a floating plug sealingly and reciprocably disposed in the bore, whereby pressure in the different sections of the bore on respective opposite sides of the plug is substantially equalized.
Claims7
A wellbore drill bit, comprising:
- a bore formed in the drill bit;
- and
- a spherically-shaped plug disposed in the bore, the plug sealingly engaging and slidingly contacting the bore, whereby the plug permits pressure communication between first and second sections of the bore while preventing fluid communication between the first and second sections, wherein the first bore section is in fluid communication with an exterior of the drill bit, and wherein the second bore section is in fluid communication with an annular gap between two seals.
A wellbore drill bit, comprising:
- a bore formed in the drill bit;
- a spherically-shaped plug sealingly and slidingly disposed in the bore, whereby the plug permits pressure communication between first and second sections of the bore while preventing fluid communication between the first and second sections, wherein the plug slidingly contacts the bore;
- and
- at least two seals which seal off an annular gap, and wherein the first bore section is in fluid communication with the annular gap between the seals.
1 more element
Dependencies are inferred from the claim text.