Friction-reducing device
This patent describes a sucker rod coupling adapted to reduce friction within production tubing in a well bore. It comprises: a substantially cylindrical body member and roller assemblies; the body member comprising means at each end thereof for attaching the coupling to a sucker rod, and axially and circumferentially spaced recesses, each recess containing a roller guide connected to the body, and each recess being further adapted to receive and support a roller assembly around the roller guide in such manner that the roller assembly can revolve around the roller guide; the roller assemblies each comprising rollers rotatably mounted on and linked by a chain, the rollers being adapted to reduce frictional contact between the body member and the tubing by rotating between the roller guide and the tubing while the chain revolves around the roller guide.
- Assignee:
- NOV; NOV-90-029045; EDB-90-152720
- Patent Number(s):
- US 4919205; A
- Application Number:
- PPN: US s 7-441827
- OSTI ID:
- 6572705
- Country of Publication:
- United States
- Language:
- English
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