Wells – Valves – closures or changeable restrictors – Fluid operated
64 1S, E21B 1700
An improved eccentrically weighted drill collar is provided which has a basically stronger structure and stress carrying ability than the eccentrically weighted collar heretofore in field use. The eccentric weighting is provided by a series of blind holes extending down one side of the drill collar. The stronger structure and stress carrying ability is afforded by arranging such holes so that they vary in size in a cyclical pattern along the length of the drill collar.
patent: 2186725 (1940-01-01), Hughes
patent: 2329597 (1943-09-01), Diehl et al.
patent: 2841366 (1958-01-01), Dunn
patent: 3160218 (1964-12-01), Crake
patent: 3391749 (1968-07-01), Arnold
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