Side port nozzle in a PDC bit

(19)

(11)

EP 0 959 224 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	12.07.2000 Bulletin 2000/28

(43)	Date of publication A2:
	24.11.1999 Bulletin 1999/47

(21)	Application number: 99303972.6

(22)	Date of filing: 21.05.1999

(51)	International Patent Classification (IPC)⁷: E21B 10/60

(84)	Designated Contracting States:
	AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
	Designated Extension States:
	AL LT LV MK RO SI

(30)

Priority:

22.05.1998 US 84066
13.05.1999 US 311141

(71)	Applicant: Dickey, Winton B.
	Rosharon, Texas 77583 (US)

(72)	Inventor:
	Dickey, Winton B. Rosharon, Texas 77583 (US)

(74)	Representative: Lawrence, John et al
	Barker Brettell 138 Hagley Road Edgbaston Birmingham B16 9PW Birmingham B16 9PW (GB)

(54)	Side port nozzle in a PDC bit

(57) Using a nozzle having both a main passageway and a side passageway in a fixed head drill bit, especially a PDC bit, provides increased cooling and cleaning power, especially to the outer cutting surfaces. Additionally, causing a smaller side port passageway in a jet nozzle to intersect a larger main passageway in the nozzle in a manner that does not contain a chamfer or taper creates a non-plugging side port. The side port can then be sized down smaller than the size of the expected largest particle present in the mud without causing problems.

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