Rolling cutter drill bit
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United States of America Patent
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Apr 14, 1987
Issued Date -
N/A
app pub date -
Feb 3, 1982
filing date -
Mar 24, 1980
priority date (Note) -
Expired
status (Latency Note)
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Abstract
This invention discloses a rolling cone drilling bit having a plurality of cutters which have inserted therein hard metal cutting elements preferably formed of tungsten carbide alloy; and in which bit the rolling cone cutters are located in such a manner that their rotational axes are greatly offset from the rotational axis of the drill bit. In addition, a fluid jetting system is provided in the invention that directs a pressurized fluid spray across the main cutting inserts and against the formation face so that when the drill bit is used in its most advantageous areas, such as the soft, medium-soft and plastic formations, the jetting system prevents 'balling up' of the cutters and greatly increases the drilling efficiency of the bit.
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