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ROLLER CONE DRILL BIT STRUCTURE HAVING IMPROVED JOURNAL ANGLE AND JOURNAL OFFSET
ROLLER CONE DRILL BIT STRUCTURE HAVING IMPROVED JOURNAL ANGLE AND JOURNAL OFFSET
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机译:滚子锥钻头的结构改善了杂志的角度和杂志的偏移量
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摘要
A roller cone drill bit is shown which includes at least one roller con e rotatably mounted on a journal forming a part of a bit body. The at least on e cone having cutting elements disposed at selected locations thereon. The at least one roller cone subtends a journal angle of less than about 35 degrees, and has an offset less than about 0.15 inches. In one embodiment, gage row cutting elements on the at least one roller cone define an oversize angle in a range of about - 1.5 to +2 degrees.
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