Luca L Ortenzi

US Patent:

6725162, Apr 20, 2004

Filed:

Dec 13, 2001

Appl. No.:

10/015470

Inventors:

John E. Edwards - Feucherolles, FR
Luca Ortenzi - Stafford TX

Assignee:

Schlumberger Technology Corporation - Sugar Land TX

International Classification:

G01V 140

US Classification:

702 6, 324338

Abstract:

A method is disclosed for producing a single logging-while-drilling (LWD) merged caliper from several indirect LWD borehole size measurements. The merging accounts for the varying validity of each input borehole size measurement as a function of the environment, the formation, and the borehole size itself. In one embodiment, the method includes obtaining a plurality of borehole size measurements from a plurality of LWD sensors and weighting each measurement with varying measurement confidence factors. One embodiment of the method includes determining a set of mathematical equations representative of the responses of the multiple sensors and solving the equation set to determine the borehole size. A computer encoded with instructions for weighting borehole size inputs and iteratively processing the weighted inputs to determine the merged caliper is also disclosed.

US Patent:

20030122067, Jul 3, 2003

Filed:

Dec 28, 2001

Appl. No.:

10/034476

Inventors:

R. Radtke - Pearland TX, US
Robert Adolph - Houston TX, US
Helene Climent - Sugar Land TX, US
Luca Ortenzi - Stafford TX, US

International Classification:

G01V005/12

US Classification:

250/269300

Abstract:

A method for tool path identification in formation evaluation includes obtaining measurements of formation properties in azimuthal sectors for each of a plurality of depth levels; calculating quality factors from the measurements; identifying a centroid or maximum of the quality factors among the measurements in each of the azimuthal sectors for each depth level; and associating the centroid or maximum of the quality factors at each depth level along a borehole to form the tool path. Calculating the quality factors may include parameterizing the measurements according to at least one factor selected from a spine factor, a rib factor, and a volumetric photoelectric factor. A method for determining corrected measurements for formation properties includes identifying a tool path from measurements taken in azimuthal sectors at each depth level along a borehole; and calculating a corrected measurement at the each depth level by averaging measurements in the azimuthal sectors adjacent the tool path.