Well collar or shoe and cementing/drilling process

Details Well collar or shoe and cementing/drilling process Well collar or shoe and cementing/drilling process

1978-09-11

1979-11-27

Novosad, Stephen J.

Wells

Processes

Cementing, plugging or consolidating

166153, 166193, E21B 3316

Patent

active

041756193

ABSTRACT:
An improved well shoe or collar has at least one tooth protruding from the top of the cement shoulder of the shoe or collar capable of engaging, denting and penetrating a pump down wipe plug and retarding the tendency of the plug to rotate when engaged by a drilling bit, thereby enhancing the drilling action of a drill bit on a pump down wipe plug. An improved process of cementing within a well and drilling through a plug comprises inserting a pump down wipe plug at the interface of a fluid and wet cement, pumping the plug down the well until it comes into contact with a shoulder of a shoe or collar having at least one protrusion extending from the surface of the shoulder capable of engaging, denting and penetrating the plug, subsequently after the cement has set, lowering a drill bit onto the top of the plug, the protrusion retarding the tendency of the plug to rotate with the rotating action of the drill bit and enhancing the drilling action of the bit.

REFERENCES:
patent: 2165433 (1939-07-01), Wickersham
patent: 3545543 (1970-12-01), Kammerer, Jr. et al.
patent: 3581817 (1971-06-01), Kammerer, Jr.
patent: 3913686 (1975-10-01), Manson, Jr.

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