MUD HAMMER

摘要

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.

主权项

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; 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.