Staged annular restriction for managed pressure drilling
US11377917B2 · kind B2 · utility
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16References
20Claims
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Key dates
| Filing date | Dec 7, 2017 |
| Grant date | Jul 5, 2022 |
| Priority date | — |
| Expiry date | Jan 7, 2038 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B47/10
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An apparatus includes a conduit forming part of a drilling fluid return path from a wellbore. The the conduit has at least one well outflow control in the conduit. The at least one well fluid outflow control has at least two annular flow restrictors each separately operable to close to a respective inner diameter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.