Drill pipe protector

Details Drill pipe protector Drill pipe protector

1987-10-15

1989-01-10

Bryant, III, James E.

Pipes and tubular conduits

Combined

With hose protector

138108, 138178, 175325, 1510405, F16L 5700

Patent

active

047966700

ABSTRACT:
A drill pipe protector which surrounds and embraces a section of drill pipe. The protector includes at least an outer portion and surface made of an elastomeric material in which a quantity of small, hard particles are interspersed. During drilling operations when the protector is placed in sliding contact with the interior surface of casing in a wellbore, the particles exposed on the protectors surface abrade away rust and other protrusions from the inner surface of the casing to rapidly reduce frictional torque and drag experienced in running the drill string. As particles and elastomer are abraded away, additional particles are exposed. In the preferred embodiment the protector is a sleeve consisting of a pair of semi-cylindrical sections, each having an outer elastomeric layer containing approximately 27% by volume and 43% of the combined weight of substantially spherical glass particles sized in the range of 0.15-0.25 millimeters and having a hardness on the MOH scale of approximately 5.5.

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patent: 4349050 (1982-09-01), Bergstrom et al.
patent: 4602690 (1986-07-01), Steizer
"Rubber Drillpipe Protectors Reduce Rotary Torque", K. T. Corbett and R. Dawson, SPE Paper No. 15565, 61st Annual Technical Conference and Exhibition of the Society of Petroleum Engineers, New Orleans, La., Oct. 5-8, 1986.

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