Modernization of rock-cutting tool for rotary-percussion drilling that implements eccentric application of impact pulses

Rotary percussion drilling with pneumatic hammers is a promising, high-performance method widely used in the practice of geological exploration, the performance of which is determined mainly by pressure and the amount of cleaning agent supplied by the compressor. The parameters of commercially available high-pressure compressors do not allow drilling at a depth of more than 300 meters, which is one of the main limiting factors of its practical application in production conditions. One of the ways to improve the performance of the rotary-percussion drilling of wells, and at the same time the maximum depth of drilled wells is to improve the mechanism of rock destruction by applying eccentric impact pulses to the drilling tool, which will make it possible to implement more actively the tangential component of the impact pulse that affects the shape and the volumes of the fracture holes being formed, providing additional splitting of the rock in the direction of the rock face. The paper discusses the ways to perfect the known designs of bits for rotary-percussion drilling of wells implementing eccentric application of impact impulses, issues of geometric substantiation of the shape of an eccentric protrusion on a drill bit torus shim for rotary-percussion drilling and oscillations of torus shim when transmitting eccentric impact pulses from the point of view of enhancement durability of a construction and accuracy of transfer of eccentric impact pulses.

drilling, productivity, eccentricity, impact, destruction, rock

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