Detachable apparatus for preventing differential pressure sticki

Details Detachable apparatus for preventing differential pressure sticki Detachable apparatus for preventing differential pressure sticki

1983-03-17

1986-07-29

Novosad, Stephen J.

Boring or penetrating the earth

With tool shaft detail

Shaft carried guide or protector

175 40, E21B 1700, E21B 3100

Patent

active

046026908

ABSTRACT:
A removable 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: 1647907 (1927-11-01), Doty
patent: 2324547 (1943-07-01), Wagner
patent: 2569625 (1951-10-01), Wyllie
patent: 2843209 (1958-07-01), Degen
patent: 3099318 (1963-07-01), Miller et al.
patent: 3361203 (1965-10-01), Rensvold
patent: 4266578 (1981-05-01), Swain et al.
patent: 4277108 (1981-07-01), Wallace

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