Rotational impact drill assembly

Details Rotational impact drill assembly Rotational impact drill assembly

E - Fixed Constructions

21

B

E21B 4/06 (2006.01) E21B 4/10 (2006.01) E21B 10/08 (2006.01) E21B 10/46 (2006.01)

Patent

CA 2380520

Apparatus is provided for introducing a consistent series of small and localized rotary impacts to a PDC bit during drilling, to improve PDC drill bit performance. Rotary impact supplements the nominal torque supplied by the rotary drive thereby avoiding lockup and potentially damaging energy storage in the drill string following windup, should the bit slow or hang up when drilling in difficult formations. The apparatus comprises a rotary hammer which is rotated about a bit shaft's anvil, preferably by a drilling fluid driven turbine. As the hammer rotates, potential energy is built up. When the hammer and anvil connect, the energy is released into the bit shaft and thus into the bit, increases its instantaneous torque and allows it to more effectively cut through difficult formations.

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