Boring or penetrating the earth – With signaling – indicating – testing or measuring
Patent
1996-03-25
1998-08-18
Dang, Hoang C.
Boring or penetrating the earth
With signaling, indicating, testing or measuring
7315244, 175 39, E21B 4500
Patent
active
057947201
ABSTRACT:
A method of assaying work of an earth boring bit of a given size and design comprises the steps of drilling a hole with the bit from an initial point to a terminal point and recording the distance between the initial and terminal points. A plurality of electrical incremental actual force signals are generated, each corresponding to a force of the bit over a respective increment of the distance between the initial and terminal points. A plurality of electrical incremental distance signals are also generated, each corresponding to the length of the increment for a respective one of the incremental actual force signals. The incremental actual force signals and the incremental distance signals are processed to produce a value corresponding to the total work done by the bit in drilling from the initial point to the terminal point. Using such a basic work assay, a number of other downhole occurrences and/or conditions can be assayed. These include a wear rating for the type of bit, a determination of whether such a bit can drill a given interval of formation, and assessment of the abrasivity of rock drilled (which in turn can be used to modify the assays of other conditions and/or occurrences), a model of the wear of such a bit in current use, and a determination of the mechanical efficiency of the bit.
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Goldman William A.
Smith Lee Morgan
Dang Hoang C.
Dresser Industries Inc.
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