FIELD: measuring equipment.
SUBSTANCE: group of inventions relates to the means for measuring drilling parameters and transmitting the measured data in the downhole during the drilling process. In particular, a telemetry system is provided for determining parameters during drilling, comprising a lower toroid containing a lower toroid winding and further configured to receive a signal from one or more sensors, an upper toroid, wherein the upper toroid comprises an upper toroid winding, and a magnet located along the rotating element inside one of the lower or upper toroid. Herewith one of the upper or lower toroid is further configured to engage with the rotating element. The lower toroid and the upper toroid are located in such a manner that the signal from the lower toroid is induced in the upper toroid.
EFFECT: lower toroid winding is nonuniform, so that the signal induced in the upper toroid, indicates the shaft rotation speed of the hydraulic downhole motor.
20 cl, 8 dwg
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