Downhole sensor system using resonant source
First Claim
1. A downhole node for a well, comprising:
- a node housing set in cement, the cement surrounding a casing of the well,a power electrode extending from the node housing to the casing; and
a ground electrode extending from the node housing to the cement and/or surrounding geologic structure;
wherein the node is powered by a power source for transmitting AC power to the node via the casing by establishing a standing wave in the casing, wherein the power source adjusts a frequency of the AC power to ensure that the node is located at an antinode of the standing wave.
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Accused Products
Abstract
A well telemetry system supplies power to downhole sensor nodes employed for obtaining telemetry data in oil wells. The nodes are held in the cement that lines the well and surround the casing. At the surface, an AC power unit is connected to the casing and geological structure that surrounds the cement. Power to nodes is supplied using an AC resonant circuit that generates standing waves of electrical power on the casing. Power from the standing waves is delivered to the nodes which are located at antinodes of the standing wave. The nodes are held in cement that surround the casing, with one of their two electrodes connected to the casing and the other connected to the cement or to geological structure.
47 Citations
20 Claims
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1. A downhole node for a well, comprising:
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a node housing set in cement, the cement surrounding a casing of the well, a power electrode extending from the node housing to the casing; and a ground electrode extending from the node housing to the cement and/or surrounding geologic structure; wherein the node is powered by a power source for transmitting AC power to the node via the casing by establishing a standing wave in the casing, wherein the power source adjusts a frequency of the AC power to ensure that the node is located at an antinode of the standing wave. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A well telemetry system for a well, comprising:
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one or more nodes set in cement, the cement surrounding a casing of the well; and a power source for transmitting AC power to the nodes via the casing by establishing a standing wave in the casing; and wherein the power source adjusts a frequency of the AC power to ensure that the nodes are located at antinodes of the standing wave. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification