Coupling structure for a compound drill stem

Details Coupling structure for a compound drill stem Coupling structure for a compound drill stem

1981-02-25

1983-03-29

Pate, III, William F.

Boring or penetrating the earth

With above-ground means for handling drilling fluid or cutting

With tool shaft having plural passages for drilling fluid

175320, 285330, E21B 1704

Patent

active

043780571

ABSTRACT:
Coupling structure to connect sections of a compound drill stem. The drill stem has concentric passages, one connected to a fluid source to provide fluid in an area being drilled and another connected to a vacuum source to carry off the fluid and accompanying cuttings from the drilling area. In the preferred embodiment, the coupling structure includes a housing with a prismatic surface that telescopically cooperates with a similarly shaped surface of at least one of the drill stem sections to effectively transmit torque through the compound stem.

REFERENCES:
patent: 1455971 (1923-05-01), Rickenbacker et al.
patent: 2839315 (1958-06-01), Artebury et al.
patent: 2967724 (1961-01-01), Adams
patent: 3664441 (1972-05-01), Carey
patent: 3786878 (1974-01-01), Clapner
patent: 3978923 (1976-09-01), Ford
patent: 4031970 (1977-06-01), Belknap
patent: 4285408 (1981-08-01), Franks

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