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| Number | Title | Issue Date |
| 7458273 | Fiber optic differential pressure sensor A fiber optic differential pressure sensor. In a described embodiment, a differential pressure sensor system for use in a subterranean well includes a fluid property sensing housing having a flow passage formed therethrough. A differential pressure sensor has an opt... | 12/02/2008 |
| 7400803 | Method and apparatus for providing a hydrogen diffusion barrier for fiber optic cables used in hostile environments A fiber optic conduit for use in a hostile environment includes an axial tube. The axial tube comprises a corrosion resistant material and is operable to receive one or more optical fibers. The fiber optic conduit further includes a hydrogen barrier shell that is di... | 07/15/2008 |
| 7360412 | Single point and fiber optic temperature measurement for correction of a gas column weight in a well Fluid column weight correction using discrete point and fiber optic temperature measurement. A method for determining pressure at a distal end of a fluid column in a well includes the steps of: dividing the fluid column into multiple segments; determining a temperat... | 04/22/2008 |
| 7325597 | Safety valve apparatus for downhole pressure transmission systems Safety valve apparatus for a pressure telemetry system utilizing a small diameter tubing conveying pressure from a downhole pressure chamber to the surface, the system pressurized with a monitoring gas, is presented. A check valve assembly is placed along the fluid ... | 02/05/2008 |
