Downhole telemetry and control system
First Claim
1. A downhole telemetry and power system for use with a borehole extending into a formation, the borehole including a casing positioned within the borehole and a piping structure contained within the casing, the system comprising:
- a surface choke coupled to the piping structure;
a surface system including a data source providing data to be transmitted, a power amplifier coupled to the data source and to an external power source, the power amplifier having an output electrically coupled to the casing and the piping structure downhole from the surface choke, the power amplifier operative to provide a power signal having a first frequency and to modulate, in a first modulation scheme, the power signal with the data to be transmitted, wherein the first frequency of power signal is selected as a function of the depth of the borehole;
a downhole choke having a first inductance, the downhole choke disposed downhole a predetermined distance within the borehole and disposed coaxially about the piping structure, wherein the first inductance is selected as a function of the depth of the borehole;
a downhole system including a power supply electrically coupled to the downhole choke, the power supply configured and arranged to receive at least a portion of the modulated power signal and to provide at least one output voltage, the downhole system further including a receiver electrically coupled to the choke coil and configured and arranged to demodulate the modulated power signal to recover the data to be transmitted.
1 Assignment
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Accused Products
Abstract
A power transmission and data communications system for use in a gas or oil well borehole is disclosed. The borehole includes a casing and a piping structure therein and at least one downhole equipment module located therein. The system provides for the power signal that is used to provide power transfer to be modulated with data and control signals that are to be transmitted to the downhole equipment located in the downhole equipment modules. In particular, the system provides for the power/data signal to be electrically coupled to the case and piping structure for transmission downhole. The downhole equipment includes a power supply that is operative to recover the power signal portion of the power/data signal and to provide power to the other downhole equipment. A downhole receiver is operative to recover the data portion of the power/data signal and to demodulate the data provided thereon. The system can further include a downhole data source coupled to a downhole transmitter for impressing the downhole data onto the case and piping structure for transmission uphole. A receiver contained in the surface equipment is operative to receive and recover the transmitted downhole data for analysis and storage by surface equipment.
24 Citations
38 Claims
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1. A downhole telemetry and power system for use with a borehole extending into a formation, the borehole including a casing positioned within the borehole and a piping structure contained within the casing, the system comprising:
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a surface choke coupled to the piping structure;
a surface system including a data source providing data to be transmitted, a power amplifier coupled to the data source and to an external power source, the power amplifier having an output electrically coupled to the casing and the piping structure downhole from the surface choke, the power amplifier operative to provide a power signal having a first frequency and to modulate, in a first modulation scheme, the power signal with the data to be transmitted, wherein the first frequency of power signal is selected as a function of the depth of the borehole;
a downhole choke having a first inductance, the downhole choke disposed downhole a predetermined distance within the borehole and disposed coaxially about the piping structure, wherein the first inductance is selected as a function of the depth of the borehole;
a downhole system including a power supply electrically coupled to the downhole choke, the power supply configured and arranged to receive at least a portion of the modulated power signal and to provide at least one output voltage, the downhole system further including a receiver electrically coupled to the choke coil and configured and arranged to demodulate the modulated power signal to recover the data to be transmitted. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38)
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Specification