Oil well pump
This patent describes a subsurface well pump for disposition within a working barrel of a well bore and arranged for reciprocal movement therebetween for elevating well fluid from a subsurface well fluid reservoir to the surface of the ground for recovery of the fluid, the improvement comprising sealing means provided on the pump for engagement with the inner periphery of the working barrel for precluding leakage of fluid between the working barrel and the outer periphery of the pump, the sealing means comprising rigid, substantially cylindrical, inner ring means and yieldable annular body means disposed around and covering the entire outer periphery of the inner ring means and adapted to extend, during use, axially into sealing engagement beyond the dimensions of the inner ring means and the yieldable annular body means having an annular groove provided around the outer periphery thereof for receiving a portion of the well fluid therein to assure an efficient lubrication between the outer periphery of the body means and the inner periphery of the working barrel during a pumping operation and the yieldable annular body means having a fluid channel provided around the inner periphery thereof for receiving fluid pressure of the well fluid therein to assure radial expansion and sealing engagement to the inner periphery of the working barrel.
- Assignee:
- NOV; NOV-89-034355; EDB-89-024578
- Patent Number(s):
- US 4762476
- OSTI ID:
- 6542936
- Country of Publication:
- United States
- Language:
- English
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