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US 7,896,628 B2Granted
Downhole motor seal and method
AssigneeSchlumberger Technology Corporation
InventorsOlivier Sindt, Geoff Downton, Laurent Carteron, Francois Clouzeau
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Abstract
The rotor of a downhole motor includes a mandrel having at least one radial lobe, and an elastomeric tubular sleeve compressed about the mandrel so as to establish frictional engagement therebetween. The sleeve is compressed about the mandrel through one of various processes, including heat shrinking, vacuum shrinking, and stretching.
Claims8
A method for making a rotor of a progressive cavity motor, comprising the step of:
- placing an elastomeric tubular sleeve, formed of a thermally shrinkable elastomer, about a rotor mandrel having at least one radial lobe so as to establish frictional engagement between the rotor mandrel and the tubular sleeve, wherein the rotor mandrel's outer surface provides a roughened surface to enhance the frictional engagement of the tubular sleeve with the rotor mandrel;
- applying heat to shrink the thermally shrinkable elastomer until the rotor mandrel's outer surface securely and frictionally engages the tubular sleeve's inner surface along the roughened surface;
- and
- inserting the rotor with the secured thermally shrinkable elastomer into the progressive cavity motor.
1 more element
Dependencies are inferred from the claim text.