| Patent Number |
Title Of Patent |
Date Issued |
| 5550411 |
Downhole instrument power supply system using shunt voltage regulation |
August 27, 1996 |
| A downhole power supply system having a variable voltage surface power supply and a downhole shunt voltage regulator between which is disposed in series an energy transducing device. The shunt voltage regulator comprises a current control device which controls the amount of current shunt |
| 5550331 |
System and method of protecting instruments from down-hole fluids |
August 27, 1996 |
| A surfactant composition is used to repel down-hole fluids such as crude oil and water to prevent their adherence to a down-hole instrument for an extended period of time. A down-hole fluid repelling surfactant, preferably in the form of a liquid solution, is applied to an exterior s |
| 5493626 |
Reduced diameter down-hole instrument electrical/optical fiber cable |
February 20, 1996 |
| The down-hole instrument cable includes a hermetically sealed optical fiber surrounded by a protective buffer layer and a protective gel within a protective tube. A layer of electrical conductors between an inner insulator and outer insulator layer surrounds the protective tube, and |
| 5440081 |
System and method of protecting optical elements from down-hole fluids |
August 8, 1995 |
| A surfactant composition is used to repel down-hole fluids such as crude oil and water to prevent remote viewing cameras from being obscured by such fluids, for extended periods of time. An effective amount of a down-hole fluid repelling surfactant, preferably in the form of a liquid |
| 5402165 |
Dual lighting system and method for a video logging |
March 28, 1995 |
| A lighting system for a logging instrument probe for inspecting a passageway having different diameters. The lighting system has a light assembly of a plurality of light sources arranged in tandem. The light assembly is mounted under the sensor to selectively illuminate that part of |
| 5355128 |
Video logging system having an optical communications link |
October 11, 1994 |
| An instrument probe contains a video camera and light source which is positioned in front of the camera for illuminating the passage being inspected, such as a bore or a casing. The power source for the instrument probe is located at the surface. A support cable contains an optical fiber |
| 5202944 |
Communication and power cable |
April 13, 1993 |
| A cable containing an optical fiber for conducting communication signals and electrical conductors for conducting power. The optical fiber is centrally located. An inner layer includes electrical conductors and an outer layer includes electrical conductors interspaced with strength m |
| 5140319 |
Video logging system having remote power source |
August 18, 1992 |
| An instrument probe contains a video camera and light source which is positioned in front of the camera for illuminating the passage being inspected, such as a bore or a casing. The power source for the instrument probe is located at the surface. A support cable contains an optical fiber |
