Schlumberger Technology Corporation

Wellbore Integrity Solutions LLC

Christopher Kang Potter

Charles H Dewey

Shantanu N Swadi

Alan Fairweather

Manoj D Mahajan

Kenneth Daniel Hora

Walter E Friedl

Milling systems, tools, and methods include using a mill with secondary attrition system to re-mill cuttings and other debris away from the face of the mill. The secondary attrition system may be located uphole of the mill may be used to stage conditioning and re-sizing of debris. After debris is generated by the mill, the secondary attrition system may re-mill the debris to a finer size before allowing the debris to pass out of the sleeve. The debris may be re-milled by secondary cutting elements while within an annular gap positioned radially between the sleeve and a drive shaft for the mill. The annular gap may have a variable width as a result of a tapered outer surface of the drive shaft and/or a tapered inner surface of the sleeve. The variable width may cause debris to be re-milled into increasingly finer sizes.

Milling tools with a secondary attrition system

Growing community of inventors

The Woodlands, TX, United States of America

Christopher Kang Potter