Drilling monitor

Details Drilling monitor Drilling monitor

E - Fixed Constructions

21

B

354/21

E21B 44/00 (2006.01) E21B 12/02 (2006.01)

Patent

CA 1231448

ABSTRACT In a drilling monitor downhole transducers provide signals representative of torque (T) and axial load (F). A downhole computer receives the torque and load signals and computes therefrom coefficients representative of drilling conditions and further circuitry combines the coefficients into a surface sendable signal indicative of drilling conditions. Signals representing T and F are received from downhole transducers at input ports of the downhole computer. From T and F measurements a relationship between T and F may be established, based on short term modelling. From the system model, torque may be predicted and correlated with the measured values received from the torque transducer. Values for the coefficients are computed and combined for sending from a transmitter to a receiver over a single low speed telemetry channel for display and recording at the surface. The invention overcomes the problem of sending a vast quantity of data to the surface in order to monitor drilling conditions by running a downhole model of the drilling operation.

486099

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