Rheometer for drilling-mud viscosity measurements
AssigneeGeolog S.r.l.
InventorAntonio Calleri
Life of this patent
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Abstract
Described herein is a rheometer comprising 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 and adapted to contain a fluid; 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 to 20 mm; wherein said stator has a radius which is longer than the outside radius of said cylindrical twin helix.
Claims11
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.
Dependencies are inferred from the claim text.