Abstract: A bidirectional telemetry system for data transfer over relatively long distances such as, for example, within an oil or gas well. Data is transferred via cable such as a single conductor cable used for the transmission of various types of logging data including, but not limited to, video signals, pressure and temperature information. A video or other signal can be electronically converted into an amplified current modulated telemetry equivalent, transmitted along a cable having a varied impedance characteristics, and electronically converted back into a compliant voltage modulated composite video standard.

Abstract: An illuminated camera apparatus can be used downhole in wellbores or other environments lacking ambient or available light. Light generated by a light emitting diode or other light source is pointed or reflected toward a glass light pipe that conveys such light past a camera or other visual image sensor. The conveyed light is diffused to evenly illuminate the surrounding environment into the field of view of the camera or other visual image sensor. At least one heat sink can be provided to absorb and/or retain heat, and isolate such heat from thermally sensitive components.

Abstract: A method and apparatus for estimating an orientation of a downhole device conveyed into a well on a conveyance device is disclosed. The apparatus includes a first sensor and a second sensor placed circumferentially spaced apart on the device to provide measurements relating to a selected downhole parameter. A processor is configured to estimate the orientation of the downhole device using a phase difference between the measurements of the first sensor and the second sensor.