Procedure for measuring the rate of penetration of a drill bit

Measuring and testing – Borehole or drilling – Downhole test

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175 40, E21B 4500

Patent

active

048438758

ABSTRACT:
The invention relates to a procedure for measuring the rate of penetration V.sub.F of a drill bit fixed to the lower end of a drill string lowered into a well. During an initial period, the well is drilled keeping, on average, the value of weight F of the drill string measured at the surface relatively constant, and the instantaneous values of the drill string rate of penetration V.sub.S and the weight F are measured at the surface at different successive moments. The value of the drill string average rate of penetration V.sub.SM at the surface is determined from the values of V.sub.S measured and the successive values of dF/dt of the first derivative with respect to time. The coefficient of apparent rigidity of the drill string during the initial period is then determined from the values of V.sub.SM, V.sub.S and dF/dt. Finally, the rate V.sub.F is calculated.

REFERENCES:
patent: 2669871 (1954-02-01), Lubinski
patent: 3777560 (1973-12-01), Guignard
patent: 4512186 (1985-04-01), Edwards
patent: 4616321 (1986-10-01), Chan

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