Subsea wellhead pressure indicating and automatic adjusting device for deep-water dual-gradient drilling
US9605499B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 7, 2016 |
| Grant date | Mar 28, 2017 |
| Priority date | — |
| Expiry date | Sep 7, 2036 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B21/082
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The present invention relates to deep-water drilling in petroleum engineering and, in particular, to a subsea wellhead pressure indicating and automatic adjusting device for deep-water dual-gradient drilling, comprising a subsea drilling fluid manifold system and a subsea wellhead pressure indicating and automatic adjusting system, wherein the subsea drilling fluid manifold system provides a flow channel for the drilling fluid returning through the wellbore so that the drilling fluid can smoothly return to a drilling platform, and provides a basis for the subsea wellhead pressure indicating and automatic adjusting system; and wherein the subsea wellhead pressure indicating and automatic adjusting system can display and adjust the subsea wellhead pressure in real time, in order to keep the subsea wellhead pressure to be constantly equal to the hydrostatic pressure of the seawater at the seabed. The present invention makes it possible to keep the subsea wellhead pressure to be constantly equal to the hydrostatic pressure of the seawater at the seabed in an automatic and real-time way, ensuring successful implementation of the dual-gradient drilling.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.