E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
255/69
E21B 10/46 (2006.01) E21B 10/54 (2006.01) E21B 10/60 (2006.01)
Patent
CA 1259605
EXPENDABLE DIAMOND DRAG BIT Abstract of the Disclosure Drag-type drilling bits are disclosed which have at least one blade and a plurality of fluid flow channels incorporated in the blade for conducting drilling fluid or drilling mud from the hollow interior of the bit to discharge or ejection ports located in the front cutting edge of the blade. Rods of diamonds or of like "hard" cutter insert materials are incorporated in the blade in such a configuration that as the blade wears away or erodes and small pieces of diamonds are lost during drilling, more diamonds are exposed to the formation for drilling. During erosion or wear of the blades, the fluid discharge ports continue to operate to eject drilling fluid adjacent to substantially each diamond rod, whereby the flushing away of cuttings and cooling of the diamonds is greatly improved. In some embodiments of the invention rods of alternating hard and soft materials are also disposed substantially parallel with the diamond or like "hard" cutter insert, rods. When the soft material of the rods is exposed for drilling the formation, kerfs are formed which are thereafter "chipped away" by the subsequently exposed hard material of the rods.
532790
Oyen Wiggs Green & Mutala Llp
Smith International Inc.
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