High bending strength ratio drill string components

Details High bending strength ratio drill string components High bending strength ratio drill string components

1986-09-19

1988-08-02

Novosad, Stephen J.

Boring or penetrating the earth

With tool shaft detail

166242, 138155, 138177, E21B 1700

Patent

active

047608897

ABSTRACT:
A drill collar is disclosed having a fishing neck just behind the pin end, which has a reduced dimension compared with the box end. Hence, the tool is particularly well suited for being oriented with its pin end up in a drill string. The BSR is enhanced while the collar retains good "fishability", and "washoverability", characteristics.

REFERENCES:
patent: 2539057 (1951-01-01), Brown
patent: 2676820 (1954-04-01), Boice
Technical Drilling Tools, Inc. publication No. 3, "Drill Collars and Drilling String Accessories", May 1979.

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