Well rod, centralizer and centralizer stop interfaces with wear

Details Well rod, centralizer and centralizer stop interfaces with wear Well rod, centralizer and centralizer stop interfaces with wear

1995-09-14

1997-12-02

Dang, Hoang C.

Wells

With below and above ground modification

Eduction pump or plunger in well

1662413, E21B 1710

Patent

active

056925620

ABSTRACT:
Improved wear interface surfaces on well rod centralizers and centralizer stops. Well apparatus includes a rotary tool in a string of tubing extending into a well hole in the earth and a rod extending to the ground surface through such tubing which is drivingly connected to the tool. Centralizers are used on the rod and are located between a pair of centralizer stops. The stops and centralizers associated therewith having wear interface surfaces and at least one of the wear interface surfaces which abut one another having a material thereon of a hardness in the range of 7 to 10 in Mohs scale of hardness and thereby having a hardness greater than the hardness of abrasive materials likely, during use, to pass through said tubing.

REFERENCES:
patent: 3104134 (1963-09-01), Nielsen et al.
patent: 4182537 (1980-01-01), Oster
patent: 4606417 (1986-08-01), Webb et al.
patent: 4757861 (1988-07-01), Klyne
patent: 5191938 (1993-03-01), Sable et al.
patent: 5247990 (1993-09-01), Sudol et al.
patent: 5339896 (1994-08-01), Hart et al.

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