Electromagnetic telemetry apparatus and methods for use in wellbore applications
First Claim
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1. A telemetry apparatus for use in a wellbore, comprising:
- a transmitter at a first location on an electrically-conductive tubular member in the wellbore that induces electromagnetic waves in the electrically-conductive tubular member that travel along an outside surface of the electrically-conductive tubular member, the transmitter including a bobbin placed around the tubular member at the first location with a gap between an inner surface of the bobbin and the tubular member, a transmitter coil wrapped around a circumference of the bobbin, and an electrically-conductive sleeve in the gap between the inner surface of the bobbin and the tubular member, the electrically-conductive sleeve having a plurality of longitudinal slits; and
a receiver placed at a second distal location on the electrically-conductive tubular member that detects the electromagnetic waves induced by the transmitter, the receiver including a receiver coil wrapped around a circumference of the electrically conductive tubular member at the second location, wherein the transmitter induces the electromagnetic waves at a frequency determined based on a spacing between the first location of the transmitter and the second location of the receiver.
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Abstract
In one aspect, an apparatus for use in a wellbore is disclosed that may include a transmitter placed on an electrically-conductive member at a first location in the wellbore configured to induce electromagnetic waves that travel along an outside of the conduit and a receiver placed on the electrically-conductive member at a second distal location in the wellbore configured to detect the electromagnetic waves induced by the transmitter.
36 Citations
23 Claims
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1. A telemetry apparatus for use in a wellbore, comprising:
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a transmitter at a first location on an electrically-conductive tubular member in the wellbore that induces electromagnetic waves in the electrically-conductive tubular member that travel along an outside surface of the electrically-conductive tubular member, the transmitter including a bobbin placed around the tubular member at the first location with a gap between an inner surface of the bobbin and the tubular member, a transmitter coil wrapped around a circumference of the bobbin, and an electrically-conductive sleeve in the gap between the inner surface of the bobbin and the tubular member, the electrically-conductive sleeve having a plurality of longitudinal slits; and a receiver placed at a second distal location on the electrically-conductive tubular member that detects the electromagnetic waves induced by the transmitter, the receiver including a receiver coil wrapped around a circumference of the electrically conductive tubular member at the second location, wherein the transmitter induces the electromagnetic waves at a frequency determined based on a spacing between the first location of the transmitter and the second location of the receiver. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A telemetry apparatus for use in a wellbore having a tubular therein, comprising:
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a transmitter comprising; a bobbin placed around the tubular at the first location with a gap between the an inner surface of the bobbin and the tubular, a first electrically-conductive member having a first plurality of substantially longitudinal slits in the gap between the inner surface of the bobbin and the tubular, wherein with the bobbin is secured around the first electrically-conductive member, and a first coil wrapped around a circumference of the bobbin; a receiver comprising a second electrically-conductive member having a second plurality of longitudinal slits and a second coil wrapped around a circumference of the second electrically-conductive member, the receiver being disposed around the tubular at a second distal location in the wellbore; a transmitter circuit configured to cause the transmitter to induce electromagnetic waves in the tubular at a frequency determined based on the distance between the transmitter and the receiver; and a receiver circuit configured to receive electromagnetic wave signals from the receiver responsive to the transmitted electromagnetic wave signals. - View Dependent Claims (16)
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17. A method of transmitting data along an electrically-conductive tubular member in a wellbore;
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transmitting electromagnetic signals representing data along an outer surface of the electrically-conductive tubular member using a transmitter disposed at a first location on the electrically-conductive tubular member, the transmitter including a bobbin placed around the electrically-conductive tubular member at the first location with a gap between an inner surface of the bobbin and the electrically-conductive tubular member, a transmitter coil wrapped around a circumference of the bobbin and an electrically-conductive sleeve in the gap between the inner surface of the bobbin and the tubular member, the electrically-conductive sleeve having a plurality of longitudinal slits; receiving the electromagnetic waves traveling along the outer surface of the electrically-conductive tubular member responsive to the transmitted electromagnetic waves using a receiver disposed at a second distal location on the electrically-conductive tubular member in the wellbore, the receiver including a receiver coil wrapped around the circumference of the electrically conductive tubular member at the second location, wherein a frequency of the electromagnetic waves is determined from a spacing between the transmitter and the receiver; and determining the data from the received electromagnetic waves. - View Dependent Claims (18, 19, 20, 21, 22, 23)
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Specification