Annulus pressure operated well monitoring
First Claim
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1. A method of communicating between a downhole system and a remote location using intermittent electrical power, the method comprising the steps of:
- receiving in the downhole system a series of spaced apart transmissions of electrical power, the system being powered by the electrical power transmissions;
setting a first telemetry bit to indicate a first bit value of a first byte of data in response to a first one of the electrical power transmissions;
communicating the first bit value to the remote location;
setting a second telemetry bit to indicate a second bit value of the first byte of data in response to a second one of the electrical power transmissions; and
communicating the second bit value to the remote location.
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Abstract
A method is provided for monitoring a well. In a described embodiment, the method uses annulus pressure to communicate between a downhole system and a remote location. The method may use intermittent electrical power generated by changes in annulus pressure to power the downhole system. Various sensors and well tools may be monitored and actuated by the downhole system, and acquired data may be transmitted to the remote location.
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Citations
64 Claims
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1. A method of communicating between a downhole system and a remote location using intermittent electrical power, the method comprising the steps of:
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receiving in the downhole system a series of spaced apart transmissions of electrical power, the system being powered by the electrical power transmissions;
setting a first telemetry bit to indicate a first bit value of a first byte of data in response to a first one of the electrical power transmissions;
communicating the first bit value to the remote location;
setting a second telemetry bit to indicate a second bit value of the first byte of data in response to a second one of the electrical power transmissions; and
communicating the second bit value to the remote location. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A method of communicating between a downhole system and a remote location, the method comprising the steps of:
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generating a series of pressure changes in a well;
acquiring into the downhole system at least one byte of data from a downhole sensor; and
transmitting to the remote location individual bits of the byte in response to respective separate ones of the series of pressure changes. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30)
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31. A method of communicating between a downhole system and a remote location, the method comprising the steps of:
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selectively altering an effective volume in a well, thereby indicating a corresponding value of a bit of a byte of data to be transmitted;
changing pressure in the well;
detecting at the remote location the effective volume of the well in response to the pressure changing step, thereby receiving the corresponding bit value at the remote location; and
repeating the selectively altering, pressure changing and detecting steps for each bit of the byte of data, thereby transmitting the byte of data to the remote location. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43)
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44. A method of communicating between a remote location and a downhole system in a well, the method comprising the steps of:
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assigning a first predetermined pressure change in the well to a corresponding first bit value;
assigning a second predetermined pressure change in the well to a corresponding second bit value; and
selectively changing pressure in the well to thereby transmit a succession of bits having the corresponding first and second values. - View Dependent Claims (45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57)
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58. A method of communicating between a remote location and a downhole system in a well, the method comprising the steps of:
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applying a first predetermined pressure change at the remote location to an annulus formed between a tubular string and a wellbore of the well, the first pressure change being indicative of a first bit value;
applying a second predetermined pressure change at the remote location to the annulus, the second pressure change being indicative of a second bit value; and
selectively repeating the first and second pressure change applying steps to thereby transmit a succession of the first and second bit values to the downhole system. - View Dependent Claims (59, 60, 61, 62, 63, 64)
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Specification