Method and arrangement for performing drilling operations
US7513310B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 12, 2004 |
| Grant date | Apr 7, 2009 |
| Priority date | — |
| Expiry date | Nov 9, 2024 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B21/08
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An arrangement and a method to control and regulate the bottom hole pressure in a well during subsea drilling at deep waters: The method involves adjustment of a liquid/air interface level in a drilling riser. The arrangement comprises a drilling riser with an outlet at a depth below the water surface. The outlet is connected to a subsea pumping system with a flow return conduit back to a drilling vessel. The intention of the system is to transport the drilling fluid and the formation particles to the surface on the drilling unit prior to setting structural pipe on the seabed and when drilling at least one hole section after the first surface structural casing have been set. The apparatus is used in order to drill all surface hole sections with the riser installed in order to avoid “pump & dump” procedures and to recover all mud and chemicals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.