Collapsible spider for use in supporting casing during upward dr

Details Collapsible spider for use in supporting casing during upward dr Collapsible spider for use in supporting casing during upward dr

1977-02-28

1979-01-09

Pate, III, William F.

Boring or penetrating the earth

With tool drive prime mover or above-ground mechanical...

With installing casing

294 8624, 294 97, E21B 1900

Patent

active

041333985

ABSTRACT:
During upward drilling operations the casing for the hole is, at times, supported from the drill stem from which the cutterhead is operatively driven. A collapsible spider is placed about the drill stem and supported therefrom, and has extension arms which, during one operating condition, pass underneath the lower end of the casing for providing it with vertical support, and in another operating condition are pivotally folded upwardly so that the casing may be moved vertically past both the spider and its associated drill stem.

REFERENCES:
patent: 549024 (1895-10-01), Ross
patent: 1282479 (1918-10-01), Smith
patent: 1502105 (1924-07-01), Loy
patent: 2160472 (1939-05-01), Cizek
patent: 3284125 (1966-11-01), Blaske, Sr. et al.
patent: 3469298 (1969-09-01), Pizzagalli
patent: 4011907 (1977-03-01), Clay

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