Dual gradient drilling system and method
US10590721B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 16, 2019 |
| Grant date | Mar 17, 2020 |
| Priority date | — |
| Expiry date | Jan 16, 2039 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B33/064
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A dual gradient drilling system includes a subsea blowout preventer disposed above a wellhead, the subsea blowout preventer having a central lumen configured to provide access to a wellbore, a lower section of a marine riser fluidly connected to the subsea blowout preventer, a closed-hydraulic positive displacement subsea pump system fluidly connected to the lower section of the marine riser and disposed at a predetermined depth, an annular sealing system disposed above the closed-hydraulic positive displacement subsea pump system, and an independent mud return line fluidly connecting one or more pump heads of the closed-hydraulic positive displacement subsea pump system to a choke manifold disposed on a floating platform of a rig.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.