engleski

A High-Temperature Low-Cost Rotational Speed Transducer for Oil-Well Telemetry

High-temperature environment of an oil-well requires reliable downhole instrumentation, typically based on simple and robust circuits, low power consumption and smart measurement algorithms. In this paper, we present electronic design and measurement methodology for a simple, low-cost rotational speed transducer, optimized for downhole spinner-flowmeter application and multichannel telemetry. We have developed and experimentally evaluated an effective algorithm for direction-sensitive rotational speed measurement, which combines quadrature pulse decoding with the method of dependant count. The algorithm employs temperature compensation techniques, making it suitable for lowcost high-temperature circuit designs. Our preliminary results confirm reliable operation of the transducer, targeted at hightemperature, short-term oil-well logging applications.

oil-well telemetry; rotational speed measurement; lowcost

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