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: 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.

Abstract: A non-electric down-hole formation pressure monitoring system utilizing a typical down-hole chemical injection system for pressure data acquisition used with surface computer integration to produce an accurate picture of formation pressure variations utilizing pressure differentials across a pressure balanced valve located adjacent the chemical injection orifice. Computer controlled manipulation of the injection pump pressure maintains a constant differential pressure across the pressure balance valve thus tracking the well formation pressure deviations. The surface computer monitors pump noise, plumbing noise due to vibration, etc., temperature, and fluid and/or gas coefficients, and compensates for any adverse effects that may affect the accuracy of the formation pressures. Down-hole pressure monitoring is achieved in chemical injection or dedicated pressure-monitoring mode with only minor surface adaptations to the well chemical injection pump skid.

Abstract: A non-electric down-hole formation pressure monitoring system utilizing typical down-hole chemical injection system technology as the basis for pressure data acquisition combined with surface computer integration whereby a constant and accurate picture of formation pressure variations may be obtained and recorded at minimum cost. Computer integration into the chemical injection system allows the pressure differential across the pressure balanced valve located adjacent the chemical injection orifice into the well production casing to be exploited by manipulation of the injection pump pressure thereby maintaining a constant differential pressure across the check valve providing a means for tracking the well formation pressure up or down. Pressure variations in the chemical injection capillary tube on the pump side of the remote pressure balance valve mimic formation flow characteristics which may be monitored by the computer at the surface where pump noise and plumbing noise due to vibration etc.