Logging while drilling method and apparatus for measuring format

Radiant energy – Geological testing or irradiation – With drill or drilling

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Details

250264, 250266, 2502693, 2502644, 2502698, G01V 510, G01V 512

Patent

active

054731585

ABSTRACT:
A method and apparatus for measuring formation characteristics as a function of angular distance segments about the borehole is disclosed. The measurement apparatus includes a logging while drilling tool which turns in the borehole while drilling. Such characteristics as bulk density, photoelectric effect (PEF), neutron porosity and ultrasonic standoff are all measured as a function of such angular distance segments where one of such segments is defined to include that portion of a "down" or earth's gravity vector which is in a radial cross sectional plane of the tool. The measurement is accomplished with either a generally cylindrical tool which generally touches a down or bottom portion of the borehole while the tool rotates in an inclined borehole or with a tool centered by stabilizer blades in the borehole.

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patent: 5237540 (1993-08-01), Malone
patent: 5250806 (1993-10-01), Rhein-Knudsen et al.
SPWLA 31st Annual Logging Symposium, Jun. 24.-27, 1990, An Innovative Approach to Correct Density Measurements While Drilling for Hole Size Effect, by Best, D.; Wraight, P.; and Holenka J.

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