Impact rotary drilling is a kind of new drilling technology, developed on the basis of rotary drilling, the principle of which is that the energy of drilling fluid during circulation and hydraulic impactor connected to the bit applies periodic and high-frequency impact loads on the bit to break rocks while rotary drilling. Practices show that the rock-breaking efficiency by the combination of impact and rotary increases 20-80% compared with traditional rotary drilling, especially in medium or harder formations. Meanwhile, drilling costs can be cut down, bit life prolonged and wellbore quality improved. The poster session analyzes the rock-breaking characteristics by impact-rotary drilling, and presents the working principles, lab tests and applications of the impact rotary-drilling tools.
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