Hydraulic tools including removable coatings, drilling systems, and methods of making and using hydraulic tools
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United States of America Patent
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Feb 20, 2018
Issued Date -
N/A
app pub date -
Dec 10, 2015
filing date -
Dec 10, 2015
priority date (Note) -
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status (Latency Note)
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Abstract
A hydraulic tool includes a stator, a rotor, and a removable coating. At least one of the stator and the rotor comprises a resilient material. The removable coating has a thickness selected to compensate for expected swelling of the resilient material or an expected contraction of a clearance between the rotor and the stator based on thermal expansion. The removable coating is disposed on a surface of at least one of the rotor and the stator, and the removable coating is formulated to be removed during operation of the hydraulic tool. A method of operating a hydraulic tool includes passing a fluid through the hydraulic tool during rotation of the rotor within the stator and removing at least a portion of the removable coating responsive to rotation of the rotor within the stator as a volume of the resilient material increases responsive to contact with the fluid passing through the hydraulic fluid.
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