Sucker rod coupling with protective coating

Details Sucker rod coupling with protective coating Sucker rod coupling with protective coating

1989-01-12

1990-03-06

Novosad, Stephen J.

Wells

With below and above ground modification

Eduction pump or plunger in well

166105, 285 55, 403270, 403307, E21B 17042

Patent

active

049057600

ABSTRACT:
A standard size, steel oil well sucker rod coupling is machined to decrease its external diameter, producing a constant diameter along its length. Then, the coupling is machined to produce chamfers or bevels around the circumference on the ends, such that the diameter at the radial faces is less than at the body of the coupling. Next, abrasive blast-cleaning of the coupling produces a uniform, angular, anchor profile along the machined areas on the exterior of the coupling. Finally, a specially selected, fusion bonded, resinous coating is applied to the exposed surface. The radial faces may or may not be coated. The unique protective coatings impart abrasion resistance in a pumping oil well and serve as an electrical barrier to preclude electrochemical, corrosive, attack of the mild steel coupling core. Extended service life of the coupling is achieved.

REFERENCES:
patent: 2690934 (1954-10-01), Holcombe
patent: 3201158 (1965-08-01), Meripol
patent: 4147819 (1979-04-01), Hukumoto et al.
patent: 4205926 (1980-06-01), Carlson
patent: 4396658 (1983-08-01), Mettes et al.
patent: 4573712 (1986-03-01), Cameron
patent: 4602807 (1986-07-01), Bowers

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