Formation evaluation system and method
First Claim
1. A method of evaluating a subterranean formation having a wellbore penetrating the subterranean formation, comprising the steps of:
- deploying a downhole tool into the wellbore;
transmitting a first electromagnetic encoded telemetry signal through the subterranean formation between a downhole tool and a surface unit;
calculating a wellsite parameter from the first encoded electromagnetic telemetry signal;
encoding at least one subsequent electromagnetic telemetry signal with data correlated with the calculated wellsite parameter;
transmitting at least one subsequent electromagnetic telemetry signal through the subterranean formation between a downhole tool and a surface unit;
receiving the second electromagnetic telemetry signal by a surface electromagnetic unit; and
determining the wellsite parameter from the at least one subsequent electromagnetic telemetry signal.
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Abstract
A formation evaluation system for a subterranean formation penetrated by a wellbore. The formation evaluation system is provided with a downhole tool and a sensor. The downhole tool is positionable in the wellbore. The downhole tool has a downhole electromagnetic unit for communication with a surface electromagnetic unit. The sensor determines at least one wellsite parameter from the electromagnetic signal. The downhole tool and the surface electromagnetic unit are adapted to pass electromagnetic signals there between. The electromagnetic signals pass through the subterranean formation whereby the senor determines the at least one wellsite parameter from the electromagnetic signal.
36 Citations
21 Claims
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1. A method of evaluating a subterranean formation having a wellbore penetrating the subterranean formation, comprising the steps of:
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deploying a downhole tool into the wellbore; transmitting a first electromagnetic encoded telemetry signal through the subterranean formation between a downhole tool and a surface unit; calculating a wellsite parameter from the first encoded electromagnetic telemetry signal; encoding at least one subsequent electromagnetic telemetry signal with data correlated with the calculated wellsite parameter; transmitting at least one subsequent electromagnetic telemetry signal through the subterranean formation between a downhole tool and a surface unit; receiving the second electromagnetic telemetry signal by a surface electromagnetic unit; and determining the wellsite parameter from the at least one subsequent electromagnetic telemetry signal.
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2. A formation evaluation system for a subterranean formation penetrated by a wellbore, comprising:
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a downhole tool positionable in the wellbore, the downhole tool having a downhole electromagnetic unit adapted to communicate with a surface electromagnetic unit via a electromagnetic signal; and wherein the electromagnetic signal passes through the subterranean formation between the downhole electromagnetic unit and the surface electromagnetic unit such that a wellsite parameter is determined as a function of one of
1) voltage and
2) current employed to generate the electromagnetic signal as attenuated by passing through the subterranean formation. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of evaluating a subterranean formation penetrated by a wellbore, comprising:
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positioning a downhole tool in the wellbore; transmitting an electromagnetic signal between a downhole electromagnetic unit of the downhole tool and a surface electromagnetic unit, wherein the electromagnetic signal transmits one of data and a command and passes through the subterranean formation; and determining a wellsite parameter from the electromagnetic signal as a function of one of
1) voltage and
2) current relating to the electromagnetic signal as attenuated by passing through the subterranean formation. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21)
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Specification