Circulation reversing tool

Details Circulation reversing tool Circulation reversing tool

1985-07-17

1987-04-14

Leppink, James A.

Boring or penetrating the earth

With means movable relative to tool below ground to stop...

175317, 175321, 175324, E21B 2100

Patent

active

046570926

ABSTRACT:
A transformable circulation tool for reversing the path of drilling fluid at the drill bit without removing the drill string from the borehole annulus is provided by a substantially hollow body having a chamber with external ports disposed between a section of the body having a through passage and a by-pass passage in combination with a diverter mounted on a telescoping member having means for engaging the body during drilling and disengaging the body for rotation of the diverter with respect to each of the passages. A seal is rotatably mounted to the substantially hollow body between the ports to divide the well borehole into an upper conventional flow portion and a lower portion where the flow of the drilling fluid can be reversed upon command from the surface.

REFERENCES:
patent: 2075064 (1937-03-01), Schumacher et al.
patent: 3365007 (1968-01-01), Skipper
patent: 3743035 (1973-07-01), Tiraspolsky
patent: 3804186 (1974-04-01), Schoeffler
patent: 3823788 (1974-07-01), Garrison et al.

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