Method for protecting a pipe casing from a drill pipe string

Details Method for protecting a pipe casing from a drill pipe string Method for protecting a pipe casing from a drill pipe string

1987-08-28

1989-05-23

Dang, Hoang C.

Boring or penetrating the earth

Processes

166241, 175325, E21B 1710

Patent

active

048321370

ABSTRACT:
An improved method for protecting a drill pipe casing from a rotatable string of drill pipe longitudinally extended therethrough. The method involves positioning a collar structure circumferentially around the upper end of one pipe section which is internally threaded and then thereafter engaging therewith the lower end of a second pipe section which is externally threaded and engageable with said first pipe section. The collar structure is formed of a poly(arylene sulfide) and is a single unitary structure having circumferentially extended outer surfaces which are adapted to resist spinning with the drill pipe string positioned in the casing structure.

REFERENCES:
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patent: 4544701 (1985-10-01), Walker
patent: 4653598 (1987-03-01), Schuh et al.
patent: 4708203 (1987-11-01), Walker
"API Recommended Practice for Drill Stem Design and Operating Limits", (1984), API, pp. 72-76.
"API Specification for Rotary Drilling Equipment", (1984), API, p. 4.
"API Recommended Practice for Care and Use of Casing and Tubing", (1984), p. 6.
Bettis Drilling Products Catalog, pp. 2,3.
"Drilling Engineering", (PennWell Publishing Co., Tulsa, OK), (1985), pp. 488-499.

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