Method for determining drilling conditions while drilling

Details Method for determining drilling conditions while drilling Method for determining drilling conditions while drilling

1988-07-13

1989-08-01

Levy, Stewart J.

Measuring and testing

Borehole or drilling

Downhole test

175 39, 175 50, E21B 4900

Patent

active

048523992

ABSTRACT:
Downhole torque and rate of penetration are utilized to develop indications of formations that are porous, argillaceous or tight. This information is useful as an aid in selecting drilling practices and drilling bits. The method separates bit effects from lithology effects when drilling with roller cone or PDC bits by utilizing surface and subsurface wellsite sensors to determine averaged values of real time penetration rate and downhole torque. Changes in bit torque are used to broadly classify the lithology into three categories: porous, argillaceous and tight formations while trends in bit torque and rate of penetration in shale are used to separate wear of the bit from changes in formation strength.

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