Wellbore signal generator
First Claim
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1. A signal generator comprisinga tool body operable to be disposed in a wellbore casing;
- a first electromagnet disposed within said tool body;
a second electromagnet disposed within said tool body opposite said first electromagnet; and
a power supply operable to selectively provide electrical current to said first and second electromagnets so as to generate a magnetic force that attracts the wellbore casing to the electromagnets so as to displace the wellbore casing, wherein a signal is generated by the displacement of the wellbore casing.
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Abstract
Methods and apparatus for generating a signal with a signal generator comprising a tool body disposed in a tubular member. A first and second electromagnets are disposed within the tool body such that the second electromagnet is opposite the first electromagnet. A power supply selectively provides electrical current to the first and second electromagnets so as to displace the tubular member and generate a signal in the surrounding formation.
26 Citations
29 Claims
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1. A signal generator comprising
a tool body operable to be disposed in a wellbore casing; -
a first electromagnet disposed within said tool body; a second electromagnet disposed within said tool body opposite said first electromagnet; and a power supply operable to selectively provide electrical current to said first and second electromagnets so as to generate a magnetic force that attracts the wellbore casing to the electromagnets so as to displace the wellbore casing, wherein a signal is generated by the displacement of the wellbore casing. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A signal generator comprising:
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a plurality of electromagnets disposed about a tool body disposed in a wellbore casing; and a power supply operable to provide electrical current to said plurality of electromagnets so as to create an attractive magnetic force between the electromagnets and the wellbore casing, wherein the attractive magnetic force generates a displacement of the casing. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A method of generating a seismic signal in a formation comprising:
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disposing a tool in a wellbore casing, wherein the tool comprises a plurality of electromagnets; supplying electrical power to the tool; and selectively applying the electrical power to the electromagnets so as to generate a magnetic force that attracts the wellbore casing to the electromagnet so as to displace the wellbore casing. - View Dependent Claims (24, 25, 26, 27, 28, 29)
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Specification