Decompression to fill pressure
US9175528B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 6, 2013 |
| Grant date | Nov 3, 2015 |
| Priority date | — |
| Expiry date | Sep 6, 2033 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B43/2607
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A method and system for lifting drilling mud from subsea to a drilling vessel includes a pump having a body with a chamber, and a bladder in the chamber. The bladder spans the chamber to define water and mud sides in the chamber. A mud inlet valve allows mud into the mud side of the chamber; which moves the bladder into the water side and urges water from the water side of the chamber through a water exit valve. Pressurized water enters the chamber through a water inlet valve, which in turn pushes the bladder and mud from the chamber through a mud exit valve. The bladder separates the mud and water as it reciprocates in the chamber. A pressure control circuit equalizes pressure across the water valves, and a control valve provides a back pressure in a discharge of the pressure control circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.