Wells – Guide for device or conduit – On sucker or pump rod
Patent
1987-08-06
1988-07-19
Novosad, Stephen J.
Wells
Guide for device or conduit
On sucker or pump rod
175323, 175325, E21B 1710
Patent
active
047578610
ABSTRACT:
A sucker rod coupling assembly is provided for connecting a pair of sucker rods and centralizing the rods in a tubing string. The coupling assembly finds particular application in connection with a rotating rod string driving an oil well downhole screw pump. The coupling assembly comprises a cylindrical solid steel shaft having externally threaded pin ends. A tubular sleeve or layer formed of non-metallic soft resilient abrasion-resistant material, such as polyurethane, is bonded to the surface of the shaft and extends its full length between the pin ends. A pair of internally threaded steel sucker rod box couplings is also provided. The box couplings are provided to interconnect the shaft with the pair of sucker rods. The shaft end face of each box coupling has a ring of soft resilient abrasion-resistant material bonded thereto. A tubular externally fluted centralizer, formed of the same material, fits loosely around the shaft. The centralizer has a snug fit in the tubing and is frictionally gripped so as to be stationary in use. One or more notches extend transversely across the upper end face of the centralizer, to permit fluid flow therethrough so that the centralizer does not seal against the coupling above it. The polyurethane layers on the shaft and coupling end faces protect the steel parts of the coupling assembly against severe abrasion wear from sand particles proceeding through the annular clearance between the centralizer and the shaft. By providing a non-rotating non-metallic centralizer at the locus of the large diameter box ends, wear of the tubing wall is substantially reduced.
REFERENCES:
patent: 2307688 (1943-01-01), Larson
patent: 2690934 (1954-10-01), Holcombe
patent: 2907351 (1959-10-01), Rohrback et al.
patent: 3528499 (1970-09-01), Collett
patent: 4182537 (1980-01-01), Oster
patent: 4549613 (1985-10-01), Case
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