US 12,222,270 B2
Rheometer for drilling-mud viscosity measurements
Antonio Calleri, San Giuliano Milanese (IT)
Assigned to Geolog S.r.l., Milan (IT)
Filed by Geolog S.r.l., San Giuliano Milanese (IT)
Filed on Mar. 13, 2022, as Appl. No. 17/693,360.
Claims priority of application No. 102021000006032 (IT), filed on Mar. 15, 2021.
Prior Publication US 2022/0291107 A1, Sep. 15, 2022
Int. Cl. G01N 11/14 (2006.01); E21B 21/01 (2006.01); G01N 33/28 (2006.01)
CPC G01N 11/14 (2013.01) [E21B 21/01 (2013.01); G01N 33/2823 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A method for measuring viscosity of a drilling mud, the method comprising:
providing a rheometer, including: a rotor comprising a rotary shaft and at least two screws extending longitudinally along a first portion of said shaft; a motor coupled to said shaft and adapted to rotatably drive said rotor; a stator having a cylindrical shape; wherein said at least two screws form a cylindrical twin helix; wherein said cylindrical twin helix has an inside radius of 2 mm to 10 mm and an outside radius of 10 mm to 20 mm; wherein said stator has an inside radius which is 31% longer than the outside radius of said cylindrical twin helix;
feeding the stator with a drilling mud, said drilling mud comprising cuttings;
activating the motor for rotating the cylindrical twin helix so as to stir the drilling mud;
measuring the viscosity of the drilling mud during stirring.