Lubricity testing with shear stress sensors
AssigneeHalliburton Energy Services, Inc.
InventorsDale E. Jamison, Andrew D. Vos
Life of this patent
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Abstract
In some examples, a lubricity testing device comprises a fluid tank and a rotational assembly positioned within the fluid tank. The rotational assembly, in turn, comprises a first shaft, a second shaft positioned within the first shaft, and a flexible coupling positioned between the first and second shafts. The flexible coupling is coupled to a first surface of the first shaft and to a second surface of the second shaft. The rotational assembly further comprises a shear stress sensor abutting the flexible coupling. The lubricity testing device also includes a test specimen abutting the rotational assembly.
Claims20
A lubricity testing device, comprising:
- a fluid tank;
- a rotational assembly positioned within the fluid tank and comprising:
- a first shaft;
- a second shaft positioned within the first shaft;
- a flexible coupling positioned between the first and second shafts, the flexible coupling coupled to a first surface of the first shaft and to a second surface of the second shaft;
- and
- a shear stress sensor abutting the flexible coupling;
- and
- a test specimen abutting the rotational assembly.
A method, comprising:
- providing a fluid tank storing fluid;
- positioning a rotational assembly inside the fluid tank and abutting a test specimen, the rotational assembly comprising multiple concentric shafts, a flexible coupling positioned between the concentric shafts, and a shear stress sensor abutting the flexible coupling;
- rotating the rotational assembly against the test specimen;
- and
- measuring shear stress in the flexible coupling using the shear stress sensor, the shear stress imparted to the flexible coupling as a result of friction between the rotational assembly and the test specimen.
Dependencies are inferred from the claim text.