The Wear Mechanism Of Impregnated Diamond Bit In Igneous Rock Formation

Igneous rocks are widely distributed in oil and gas basin, the igneous reservoirs have already been found at home and abroad, with the demand of oil and gas resources increased, igneous reservoir exploitation is paid more and more attention, But this kind of rocks has deep reservoir, complex overlying strata, high temperature and frequent lithology change, it also has big difference between physical and mechanical properties, high rock abrasiveness, high hardness, low drillability, low bit adaptability, low efficiency of rock broken, leading to drilling speed slowly. Impregnated diamond bit is that the diamond particles are inserted into the body of the diamond drill bit, with the wear of diamond particles, threshing and the exposure of new diamond particles, we must ensure that the bit has a longer service life and the average drilling rate; Impregnated diamond bit is the main rock broken tool to deal with hard abrasive formation, compared with cone bit and PDC bit, this bit has a significant advantage in the igneous rock formation.In this paper, we took the volcano rock in the north of Songliao Basin as the subject to identify lithologic identification, the prediction of rock mechanical parameters and abrasive test, classification and prediction; and the use abrasive experiment system to simulate the wear mechanism of impregnated diamond bit matrix and diamond particles, to reveal mechanism of the broken rocks, wear mechanism of diamond particles and matrix, diamond protrusion mechanism. Finally, the mechanical drilling rate equation of impregnated diamond bit is based on the diamond particles and matrix constant wear, to evaluate the impregnated diamond bit drilling efficiency. Which lays a foundation for impregnated diamond bit selecting and personalized designing in igneous rock formation in the future.