Boring or penetrating the earth – Processes – Boring curved or redirected bores
Patent
1981-01-08
1984-01-31
Novosad, Stephen J.
Boring or penetrating the earth
Processes
Boring curved or redirected bores
175 76, 175325, E21B 708, E21B 1702
Patent
active
044284411
ABSTRACT:
A method for reducing the sticking tendency of a rotating drill string in its drill cuttings and the surrounding wall cake by constructing the drill string elements, such as the tool joints, drill collars, wear knots, etc. with noncircular cross-sectional shapes. The noncircular shapes may be triangular, square or other higher order multi-faceted shapes, or elliptical, etc. Rotation of the drill string causes a periodic opening to form between the noncircular elements and the cuttings and wall cake which results in a movement of the mass of solids around the noncircular elements to positions away from the drill string, thereby mitigating the tendency of the drill string to differentially stick. Further, hydraulic seals are also likely to be broken by the reciprocating action of the noncircular elements.
REFERENCES:
patent: 3146611 (1964-09-01), Fox
patent: 3237427 (1966-03-01), Scarborough
patent: 3267695 (1966-08-01), Toelke
patent: 3382938 (1968-05-01), Williams, Jr.
patent: 3525237 (1970-08-01), Lari
patent: 4246975 (1981-01-01), Dellinger
Gilman M. G.
McKillop A. J.
Mobil Oil Corporation
Novosad Stephen J.
Powers, Jr. J. F.
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