Mud hammer
First Claim
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1. A mud pulse telemetry method comprising:
- operating a downhole pulser in a drill string to generate pressure pulses by flowing drilling fluid through the drill string, the flowing drilling fluid causing oscillating motion of a movable member of the pulser, the movable member comprising a hammer for generating drilling fluid pulses within a bore of the drill string;
altering motion of the movable member by applying electromagnetic forces to the movable member to alter one or both of the intensity and timing of the pressure pulses according to telemetry data.
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Abstract
A mud hammer is driven by the flow of drilling fluid to generate pressure pulses. Timing and/or amplitude of the pulses are altered to encode data by applying electromagnetic forces to a movable member of the mud hammer. In an example embodiment the movable member carries one or more magnets and electromagnetic forces are applied to the movable member by one or more electromagnets. The mud hammer may also generate electrical power that may be applied to charge batteries and/or drive downhole electrical apparatus.
70 Citations
55 Claims
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1. A mud pulse telemetry method comprising:
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operating a downhole pulser in a drill string to generate pressure pulses by flowing drilling fluid through the drill string, the flowing drilling fluid causing oscillating motion of a movable member of the pulser, the movable member comprising a hammer for generating drilling fluid pulses within a bore of the drill string; altering motion of the movable member by applying electromagnetic forces to the movable member to alter one or both of the intensity and timing of the pressure pulses according to telemetry data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 36, 37)
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24. A method for operating a mud hammer, the method comprising:
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providing a hammer for generating drilling fluid pulses within a bore of a drill string, at least one magnet coupled to the hammer, an electromagnet located to generate a variable magnetic field at the magnet and a power source connected to drive the electromagnet; driving motion of the hammer under the combined influence of a flow of drilling fluid through the bore and the variable magnetic field and controlling the variable magnetic field to alter the motion of the hammer to generate pulses in the drilling fluid, the pulses encoding data. - View Dependent Claims (25, 26)
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27. A mud hammer comprising:
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a hammer movable relative to a fluid port in a bore of a drill string section to generate drilling fluid pulses within the bore; a magnet; a coil located near the magnet; a power source connected to energize the coil to generate a variable magnetic field at the magnet; wherein; one of the magnet and the coil is coupled to the hammer; and the power source comprises a control circuit configured to receive a signal encoding data; and
the control circuit is configured to control the variable current through the coil to alter motion of the hammer to generate drilling fluid pulses encoding the data. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55)
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Specification