Title: Enhanced cross-flow with two jet drilling

Abstract: A drill bit having three cone-shaped cutters is formed with two drilling fluid nozzles on opposite sides of one of the cutters and with an enlarged return passage for the drilling fluid being formed between the other two cutters. Flow restrictors adjacent the two nozzles restrict the flow of return fluid in those areas. A flow diverter in the dome area of the bit extends into the space between the cutters to better direct fluid across the bottom of the hole where cuttings are being generated by the cutter teeth.

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Inventors: Allen, James H. (Lakewood, CA, US)
Baker, III, William (Costa Mesa, CA, US)

Application Number: 933628
Filing Date: 1978-08-14
Publication_date: 1980-02-19
Assignee: Smith International, Inc. (Newport Beach, CA)
Primary Class(es): 175/339
Other Classes:
US Patent Ref:

1922436	Aug, 1933	Herrington	175/340.
1999131	Apr, 1935	Reed	175/339.
2207766	Jul, 1940	Thompson	175/340.
2776115	Jan, 1957	William, Jr.	175/339.
3363706	Jan, 1968	Feenstra	175/340.
3509952	May, 1970	Galle	175/339.
3618682	Nov, 1971	Bennett	175/65.
4022285	May, 1977	Frank	175/340.
4126194	Nov, 1978	Evans	175/340.

Other Refs: 2529380258972

Jan, 1976	DE
Dec, 1969	SU

Primary Examiner: Leppink, James A.
Assistant Examiner: Favreau, Richard E.
Attorney: Knobbe, Martens, Olson, Hubbard & Bear