Apparatus for preventing differential sticking in wells

Details Apparatus for preventing differential sticking in wells Apparatus for preventing differential sticking in wells

1980-12-11

1984-01-24

Novosad, Stephen J.

Boring or penetrating the earth

With tool shaft detail

Shaft carried guide or protector

138143, 138146, 175 40, 464183, E21B 1716, E21B 4700

Patent

active

044270801

ABSTRACT:
A porous layer is placed on the outside of various well implements. The layer allows movement of liquid toward sites of localized low pressure and therefore prevents differential pressure stickage of the well implements on the borehole wall.

REFERENCES:
patent: 1710471 (1929-04-01), Cater
patent: 2335558 (1943-11-01), Young
patent: 2392263 (1946-01-01), Records
patent: 2569625 (1951-10-01), Wyllie
patent: 2843209 (1958-07-01), Degen
patent: 2981333 (1961-04-01), Miller et al.
patent: 3173488 (1965-03-01), Rensvold
patent: 3361203 (1968-01-01), Rensvold
patent: 3411321 (1968-11-01), Schurman

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