Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Patent
1984-06-29
1985-11-12
Novosad, Stephen J.
Boring or penetrating the earth
Bit or bit element
Rolling cutter bit or rolling cutter bit element
175350, 175361, 175377, 175372, E21B 1010
Patent
active
045522324
ABSTRACT:
A rotary drag drill bit is seen wherein cutter bodies are rotatively connected to a main body structure at a fully offset position. The fully offset position is defined by a rotational axis of each cutter body, a longitudinal axis of the drill bit and end support points or positions of the cutter bodies. The rotational axes of the cutter bodies are perpendicular to the longitudinal axis of the drill bit. The end supports of the cutter body are each equal distance from any point on the longitudinal axis of the drill bit. The cutter bodies of essentially ellipsoidal configuration, being slightly thicker at a mid-portion thereof. Cutting elements are connected to flutes projecting above an outer surface of each cutter body. In a primary rotational direction of the drill string and drill bit, the rows abrade the bottom and side walls of a well bore as the cutter body attacks the earth formation as the drill bit is rotated. The impingement of the cutting elements of the cutter body on the earth formation imparts a secondary rotation to the cutter bodies, which secondary rotation is induced by the primary rotation. The secondary rotation allows the rows of cutting elements to engage the side wall of the bore and gauge the hole as well as abrading away material from the bottom of the well bore. A roller bearing assembly is provided for the cutter body to permit the secondary rotation, while a thrust bearing assembly assists the primary abrasive action imparted by the primary rotational movement of the rotary drill bit. A lubrication system is included in the main body structure of the drill bit wherein both the roller bearing assembly and thrust bearing assembly are lubricated.
REFERENCES:
patent: 1124242 (1915-01-01), Hughes
patent: 1789834 (1931-01-01), Paulsen
patent: 1866082 (1932-07-01), Carlson
patent: 2174587 (1939-10-01), Love
patent: 2182247 (1939-12-01), Catland
patent: 2528300 (1950-10-01), Degner
patent: 2687875 (1954-08-01), Morlan et al.
patent: 3199878 (1965-08-01), Cunningham et al.
patent: 3299973 (1967-01-01), Swart et al.
patent: 4109737 (1978-08-01), Bovenkerk
patent: 4161225 (1979-07-01), Mitchell
Anderson Gregg I.
Goodwin M.
Novosad Stephen J.
Spiral Drilling Systems, Inc.
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