Teledrift is a simple, rugged mechanical signalling instrument that can be quickly installed in your drillstring whilst making up the B.H.A. It provides a coontinuous check on hole deviation with a sensing and signalling tool contained in the bore of a special sub just above the drill bit. The tool generates signals in the form of pressure surges in the mud stream. These signals are received by a recorder situated near the driller's station. The recorder provides an individual, permanent chart of each deviation reading.
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