| EXPRO NORTH SEA LIMITED Patent applications |
| Patent application number | Title | Published |
|---|
| 20110163830 | FLOW LINE ELECTRIC IMPEDANCE GENERATION - A flowline electrical impedance generation apparatus for generating a local electrical impedance in a metallic tubing portion of a flowline may be used in place of insulation joints in various systems. The impedance generation apparatus is tuned or tuneable to achieve maximum impedance at chosen frequencies, i.e., frequencies which it is desired to block. | 07-07-2011 |
| 20110148656 | DOWNHOLE POWER GENERATION - Downhole electrical power generation apparatus and methods of using stored pressurized gas and/or ambient downhole pressure. One example comprises first and second fluid receiving chambers, a fluid communication path for allowing flow of fluid from the first chamber via the fluid communication path to the second chamber and a turbine generator disposed so that fluid flowing from the first chamber via the fluid communications path to the second chamber operates the turbine generator to generate electrical power. | 06-23-2011 |
| 20110094752 | CONTROL OF SUB SURFACE SAFETY VALVES - A well installation including metallic structure having downhole metallic tubing for conveying product towards the surface, a sub surface safety valve disposed in the downhole metallic tubing for interrupting flow of product towards the surface when closed and allowing flow of product towards the surface when open. Also, valve control means are disposed downhole and arranged for detecting electrical signals in the downhole metallic tubing and for holding the valve open while receiving an electrical signal, and surface signaling means for applying an electrical signal to metallic structure of the well for transmission via the downhole metallic tubing towards the valve control means so as to hold the valve open. The system can be made more robust by ensuring that the control means will only hold the valve open while receiving a signal of given characteristics to help prevent stray currents erroneously holding the valve open. This signal selective aspect of the system may be implemented using a tuned impedance generation means. | 04-28-2011 |
| 20100047040 | DEPLOYMENT SYSTEM - A deployment system ( | 02-25-2010 |
