Subsea chemical injection unit for additive injection and monitoring system for oilfield operations
US7234524B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 14, 2003 |
| Grant date | Jun 26, 2007 |
| Priority date | — |
| Expiry date | Mar 1, 2024 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B37/06
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A system monitors and controls the injection of additives into formation fluids recovered through a subsea well. The system includes a chemical injection unit and a controller positioned at a remote subsea location. The injection unit uses a pump to supply one or more selected additives from a subsea and/or remote supply unit. The controller operates the pump to control the additive flow rate based on signals provided by sensors measuring a parameter of interest. A one mode system includes a surface facility for supporting the subsea chemical injection and monitoring activities. In one embodiment, the surface facility is an offshore rig that provides power and has a chemical supply that provides additives to one or more injection units. In another embodiment, the surface facility includes a relatively stationary buoy and a mobile service vessel. When needed, the service vessel transfers additives to the chemical injection units via the buoy.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.