Patent ID: 9042200
Filing Date: 2015-05-26
Classification: E21B

Abstract:
1. A downhole telemetry system usable within a completed subterranean well including an internal tube space, tubing annulus and a packer, the downhole telemetry system comprising: at least one pressure pulse generator is configured to generate a pressure pulse, the at least one pressure pulse generator connected to at least one of (i) the internal tube space of the well, wherein the generated pressure pulse propagates downwards into the internal tube space and then upwards through the packer to the tubing annulus, and (ii) the tubing annulus, wherein the generated pressure pulse propagates downwards into the tubing annulus and then upwards through the packer to the internal tube space, at least one first pressure transmitter located in the internal tube space to measure a pressure of the internal tube space when the generated pressure pulse propagates downwards into the tubing annulus and then upwards through the packer to the internal tube space, at least one second pressure transmitter located in the tubing annulus to measure a pressure of the tubing annulus when the generated pressure pulse propagates downwards into the internal tube space and then upwards through the packer to the tubing annulus, the packer providing hydraulic isolation of the tubing annulus, at least one transmitter located below the packer to respond to at least one physical quantity characterizing a bottom-hole zone, a data encoder located below the packer to read out the at least one transmitter located below the packer, a pressure pulse modulator adapted to change amplitude characteristics or phase characteristics of the pressure pulse generated by the at least one pressure pulse generator and located on the tubing annulus below the packer, wherein the pressure pulse modulator is a mechanical device which is controlled by the data encoder and which changes hydraulic characteristics of a tube segment where the pressure pulse modulator is installed, a surface-mounted data-collection unit which converts an output data of the at least one first pressure transmitter and the at least one second pressure transmitter into analog or digital data, and a surface-mounted data decoder to receive and analyze the analog or digital data from the surface-mounted data-collection unit.