Valve assembly for drilling mud circulation and associated drilling elements
US9976366B2 · kind B2 · utility
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1References
9Claims
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Assignee
Inventor
Key dates
| Filing date | Sep 1, 2014 |
| Grant date | May 22, 2018 |
| Priority date | — |
| Expiry date | Dec 20, 2034 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B21/106
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A valve assembly is for selectively opening and closing a radial aperture provided on a drilling element for drilling mud circulation. The valve assembly includes a valve body that has an inlet aperture and an outlet aperture, and a duct for putting the apertures in communication with each other, thereby defining a mud path (p). The valve assembly includes at least two shutters arranged in a cascade along the direction of the mud path (p), thus forming at least a double barrier.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.