Measurement while drilling electromagnetic telemetry system using a fixed downhole receiver
First Claim
1. A downhole telemetry system, comprising:
- a first tubular disposed within a borehole, the first tubular having an elongated body and including at least one slot formed in a portion thereof;
a second tubular being disposed within the first tubular; and
a receiver adapted to receive a signal, the receiver being mounted on the outer surface of the second tubular within the first tubular such that the receiver is aligned with the at least one slot formed in the first tubular.
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Accused Products
Abstract
A system and method for enhancing the reception of electromagnetic (EM) waves in a fixed downhole receiver of an EM telemetry system is provided. In one embodiment, slots are formed in a portion of an outer casing and an EM receiver is positioned within the outer casing so as to be aligned with the slots formed therein. In another embodiment, an inductive coupling arrangement is provided to transfer signals from an EM receiver mounted on the outside surface of an outer casing to a wireline that is attached to the outer surface of an inner casing, which is disposed within the outer casing. In yet another embodiment, an insulated gap is formed in the surface of the outer casing. An EM receiver, mounted on the outer surface of the inner casing, is positioned above the insulated gap of the outer casing. An electrical coupling mechanism is further provided to electrically couple the inner and outer conductors at a point above the EM receiver.
125 Citations
39 Claims
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1. A downhole telemetry system, comprising:
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a first tubular disposed within a borehole, the first tubular having an elongated body and including at least one slot formed in a portion thereof;
a second tubular being disposed within the first tubular; and
a receiver adapted to receive a signal, the receiver being mounted on the outer surface of the second tubular within the first tubular such that the receiver is aligned with the at least one slot formed in the first tubular. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for downhole telemetry, comprising:
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disposing a first tubular within a borehole, the first tubular including at least one slot formed in a portion thereof;
disposing a second tubular within the first tubular, the second tubular having at least one receiver mounted on its outer surface;
positioning the second tubular within the first tubular such that the at least one receiver is aligned with the slotted portion of the first tubular; and
receiving a signal at the at least one receiver. - View Dependent Claims (11, 12, 13, 14)
coupling a wireline to the receiver;
attaching the wireline to the outer surface of the second tubular; and
carrying the received signal from the receiver to a remote location over the wireline.
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14. The method of claim 10, further comprising:
applying an insulating material onto the outer surface of the second tubular, and carrying the received signal along the second tubular.
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15. A downhole telemetry system, comprising
a first tubular disposed within a borehole; -
a second tubular being disposed within the first tubular, the second tubular having a wireline attached to its outer surface;
a receiver adapted to receive a signal, the receiver being mounted on the outer surface of the first tubular;
a first coupler mounted on the outer surface of the first tubular and connected to the receiver; and
a second coupler mounted on the outer surface of the second tubular and connected to the wireline;
wherein the first coupler is adapted to transfer the signal received by the receiver to the wireline via the second coupler. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22)
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23. A method for downhole telemetry, comprising:
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mounting a first inductive coupler and a receiver on the outer surface of a first tubular, the first inductive coupler and receiver being connected to each other;
mounting a second inductive coupler on the outer surface of a second tubular;
disposing the second tubular within the first tubular; and
receiving a first signal at the receiver and transferring the first signal from the first inductive coupler to the second inductive coupler. - View Dependent Claims (24, 25, 26, 27)
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28. A downhole telemetry method, comprising:
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mounting a first inductive coupler and a transceiver on the outer surface of a first tubular, the first inductive coupler and transceiver being connected to each other;
mounting a second inductive coupler on the outer surface of a second tubular;
disposing the second tubular within the first tubular; and
receiving a first signal at the transceiver and transferring the first signal from the first inductive coupler to the second inductive coupler. - View Dependent Claims (29, 30, 31, 32)
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33. A downhole telemetry system, comprising:
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a first tubular disposed within a borehole, the first tubular having an elongated body and including an insulated gap formed in a portion thereof;
a second tubular disposed within the first tubular, the second tubular having a receiver mounted on its outer surface; and
an electrical coupling mechanism adapted to electrically couple the first tubular to the second tubular; and
wherein the second tubular is positioned within the first tubular such that the electrical coupling mechanism is positioned above the receiver on the second tubular and the receiver is positioned above the insulated gap formed in the first tubular. - View Dependent Claims (34, 35, 36, 37, 38)
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39. A method for downhole telemetry, comprising:
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disposing a first tubular within a borehole, the first tubular having an elongated body and including an insulated gap formed in a portion thereof;
disposing a second tubular within the first tubular, the second tubular having a receiver mounted on its outer surface, and the second tubular being positioned with the first tubular such that the receiver mounted on its surface is positioned above the insulated gap formed in the first tubular; and
electrically coupling the first tubular to the second tubular, the electrical coupling occurring above the receiver mounted on the second tubular.
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Specification