Subsea coiled tubing injector with pressure compensation
US7380589B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 9, 2003 |
| Grant date | Jun 3, 2008 |
| Priority date | — |
| Expiry date | Jun 2, 2026 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B19/22
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A pressure compensated tubing injector for injecting coiled tubing into a subsea wellhead or flowline. A traction device including grippers carried on respective opposing chain loops provides gripping engagement with the coiled tubing to longitudinally move the coiled tubing. A plurality of sealed outboard bearing assemblies guide movement of the chain loops. A drive unit powers the chain loops and includes a sealed gear case. One or more pressure compensators are placed in communication with the sealed gear case and one or more of the bearing assemblies, to compensate for subsea pressure and prevent intrusion of seawater. The bearing assemblies may include self-contained pressure compensators.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.