Soft formation drill bit

Details Soft formation drill bit Soft formation drill bit

E - Fixed Constructions

21

B

255/74

E21B 10/00 (2006.01) E21B 10/16 (2006.01) E21B 10/52 (2006.01) E21B 17/10 (2006.01)

Patent

CA 1067065

ABSTRACT OF THE DISCLOSURE The invention relates to drill bits and more speci- fically to rook bits for drilling oil wells. It is of particular value in drilling shales, salt, gypsum and the like. For a number of years drill bits have been manufac- tured with rotary cone cutters of the milled tooth type. In more recent years it has been the practice to mount har- dened inserts of tungsten carbide in place of the milled teeth. A milled tooth cutter provides longer teeth and better soft formation penetration than a conventional hardened insert cutter with short insert extension. It will out faster than the conventional hardened insert cutter in such formations but a milled tooth cutter has a short useful life. as compared with a hardened insert cutter. Up till now, hardened insert cutters have not been produced with long insert extension due to the difficulty in anchoring the inserts in the cutters. The present invention provides a rock bit with rotary cone cutters having hardened insert teeth utilizing fewer than the normal number of teeth or of cutters for a given gage hole. The cone cutter body is of greater diameter and a greater wall thickness for approxi- mately the same axial length, to accommodate a greater insert tooth depth or grip length and permit a proportional increase in extension of the insert from the cutter body to provide greater penetration with fewer insert teeth in contact at a given time.

279910

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