Downhole sensing for electromagnetic telemetry
AssigneeSchlumberger Technology Corporation
InventorsLuis Eduardo DePavia, Dean Homan, Robert Tennent, Gaelle Jannin, Liang Sun, Jiuping Chen
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Abstract
A method for recovering data from a downhole tool in a wellbore includes measuring an electromagnetic signal using first and second sensors. At least a portion of the electromagnetic signal is transmitted by a downhole tool positioned in a first wellbore. The first and second sensors are each positioned at a different location along a length of a second wellbore. The electromagnetic signal measured by the first and second sensors is decoded to recover a property measured by the downhole tool.
Claims20
A method for recovering data from a downhole tool in a wellbore, comprising:
- measuring an electromagnetic signal using first and second sensors, wherein at least a portion of the electromagnetic signal is transmitted by the downhole tool positioned in a first wellbore, and wherein the first and second sensors are each positioned at a different location along a length of a second wellbore;
- and
- decoding the electromagnetic signal measured by the first and second sensors to recover a property measured by the downhole tool.
A system for recovering data from a downhole tool in a wellbore, comprising:
- a first sensor configured to measure an electromagnetic signal transmitted by the downhole tool in a first wellbore, wherein the first sensor is in a second wellbore;
- a second sensor configured to measure the electromagnetic signal transmitted by the downhole tool, wherein the first and second sensors are each positioned at a different location along a length of the second wellbore;
- and
- a computer system configured to determine a voltage differential between the first and second sensors and decode the voltage differential to recover a property measured by the downhole tool.
A method for recovering data from a downhole tool in a wellbore, comprising:
- measuring an electromagnetic signal using a toroidal sensor, wherein at least a portion of the electromagnetic signal is transmitted by a downhole tool positioned in a first wellbore;
- and
- decoding the electromagnetic signal measured by the toroidal sensor to recover a property measured by the downhole tool.
Dependencies are inferred from the claim text.