Method of determining the drilling conditions associated with th

Details Method of determining the drilling conditions associated with th Method of determining the drilling conditions associated with th

1991-07-11

1993-06-08

Williams, Hezron E.

Measuring and testing

Borehole or drilling

Downhole test

731515, 73152, 175 39, 175 50, E21B 4400, E21B 4700

Patent

active

052169170

ABSTRACT:
This invention is based on a new model describing the drilling process of a drag bit and concerns a method of determining the drilling conditions associated with the drilling of a borehole through subterranean formations, each one corresponding to a particular lithology, the borehole being drilled with a rotary drag bit, the method comprising the steps of: measuring the weight W applied on the bit, the bit torque T, the angular rotation speed .omega. of the bit and the rate of penetration .nu. of the bit to obtain sets of data (W.sub.i, T.sub.i, .nu..sub.i, .omega..sub.i) corresponding to different depths; calculating the specific energy E.sub.i and the drilling strength S.sub.i from the data (W.sub.i, T.sub.i, .nu..sub.i, .omega..sub.i); identifying at least one linear cluster of values (E.sub.i, S.sub.i), said cluster corresponding to a particular lithology; and determining the drilling conditions from said linear cluster. The slope of the linear cluster is determined, from which the internal friction angle .phi. of the formation is estimated. The intrinsic specific energy .epsilon. of the formation and the drilling efficiency are also determined. Change of lithology, wear of the bit and bit balling can be detected.

REFERENCES:
patent: 4627276 (1986-12-01), Burgess et al.
patent: 4697650 (1987-10-01), Fontenot
patent: 4876886 (1989-10-01), Bible et al.

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