Downhole telemetry system

Patent metadata

Field	Value
Publication number	US-9042200-B2
Application number	US-63707409-A
Country	US
Kind code	B2
Filing date	Dec 14, 2009
Priority date	Dec 12, 2008
Publication date	May 26, 2015
Grant date	May 26, 2015

Abstract

A downhole telemetry system usable with a subterranean well comprises at least one pressure pulse generator, at least one pressure transmitter located in an internal tube space in the well and at least one pressure transmitter located in a tubing annulus. The system comprises a packer providing hydraulic isolation of the tubing annulus and at least one transmitter located below the packer and responding to at least one physical quantity characterizing a bottom-hole zone. The system also includes a data encoder located below the packer to read out the transmitter located below the packer and to respond to at least one physical quantity characterizing the bottom-hole zone, a pressure pulse modulator to modulate pressure pulses generated by the pressure pulse generator, a surface-mounted data-collection unit to converts the output data of the transmitters and to provide a surface-mounted data decoder with data for analysis.

First claim

The invention claimed is:

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.

2. The system of claim 1 , wherein the pressure pulse modulator has a form of a valve chamber.

3. The system of claim 1 , wherein the at least one pressure pulse generator is a mechanical device that increases or decreases the pressure pulse.

4. The system of claim 1 , wherein the at least one physical quantity, which characterizes the bottom-hole zone and which the at least one transmitter located below the packer responds to, is a pressure or a temperature.

5. The system of claim 1 , wherein the at least one first pressure transmitter is located in the internal tube space in a well head.

Assignees

• Segal Arkadiy Yurievich
• Schlumberger Technology Corp

Inventors

• Segal Arkadiy Yurievich

Classifications

• E21B47/20 Primary

  by modulation of mud waves, e.g. by continuous modulation · CPC title

• E21B47/182 Primary

  Fixed Constructions · mapped topic

• E21B47/12

  Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling · CPC title