Flexible drill string member especially for use in directional d

Details Flexible drill string member especially for use in directional d Flexible drill string member especially for use in directional d

1987-10-22

1989-03-14

Kisliuk, Bruce M.

Boring or penetrating the earth

With tool shaft detail

Helix or helically arranged structure

138118, 464 18, 29469, E21B 1722, B23P 2100

Patent

active

048118001

ABSTRACT:
The invention relates to an improved drill string member having at least one spiral groove formed in its outside surface and incorporating a combination of engineering considerations and criteria such that the invention member will have an extraordinarily high performance capacity in directional drilling. The invention member can make bends in the well on radii as short as 25-50 feet and is particularly suitable for operation together with downhole motor driven bits.

REFERENCES:
patent: 2460657 (1949-02-01), Robinson
patent: 2999552 (1961-09-01), Fox
patent: 3125173 (1964-03-01), Fox
patent: 3194331 (1965-07-01), Arnold
patent: 3360960 (1968-01-01), Massey
patent: 3554307 (1971-01-01), Yount
patent: 4365678 (1982-12-01), Fitch
patent: 4443762 (1984-04-01), Kuckes
patent: 4460202 (1984-07-01), Chance et al.

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