Development Of The Matrix Of Impregnated Diamond Bit In Slippery Formation

Mineral resources are the material basis of social development and have a fundamental,overall and strategic position in the process of modernization in our country.In mineral resource exploration,the drilling efficiency and drilling cost of slippery formations(weakly abrasive formations)have always been bottlenecks restricting the exploration speed.Although reducing the wear resistance and hardness of the drill bit matrix can increase the drilling speed of the slippery formation to a certain extent,it also greatly reduces the service life of the drill bit.With the continuous deepening of the exploration depth of mineral resources,the weight of the impact of the life of the drill bit on the comprehensive cost of drilling and the efficiency of drilling is increasing.Therefore,the development of a diamond that can increase the drilling speed of slippery formations without shortening the service life The drill bit has very important engineering significance.The traditional solution is to reduce the wear resistance and hardness of the drill bit matrix to improve the cutting edge efficiency and drilling efficiency of the drill bit.As the drilling depth increases,the life of the drill bit becomes more and more important.The development of a drill bit matrix that is easy to edge out and has a long service life is of great significance to solving the problem of drilling into slippery formations.To ensure the service life of the diamond bit,it means that in the drilling of slippery formations,the wear resistance and hardness of the bit matrix cannot be reduced to increase the speed of diamond particles.In order to achieve this goal,we first analyzed the cutting edge mechanism of diamond particles in the tire block.Through analysis,it is believed that adding easy-to-break hollow microspheres into the conventional matrix matrix may increase the cutting edge speed of diamond particles.In order to verify the feasibility of this approach,hollow spheres of three materials: alumina ceramics,yttrium-stabilized zirconia ceramics,and calcium-stabilized zirconia ceramics were selected,and 13 carcass samples of different formulations were sintered and tested.Three-factor four-level orthogonal experiment was performed on the samples,and the hardness,impact toughness,flexural strength and wear resistance of each sample were measured.The morphology of the carcass sample with the sharpened edge was observed by scanning electron microscope.The test results show that adding ceramic hollow balls to the carcass reduces the hardness of the carcass slightly.The more hollow balls and the larger the particle size,the lower the bending strength and impact toughness of the carcass.The more ceramic hollow balls are added,the better the carcass wear resistance.The greater the amount of ceramic hollow balls added,the greater the surface roughness of the carcass.The addition of ceramic hollow spheres increases the porosity of the matrix,thereby increasing the speed of diamond particles.Through comparative analysis of test results,the effect of adding yttrium-stabilized zirconia ceramic hollow spheres is better.When 10% yttrium-stabilized zirconia hollow spheres with a volume content of 10% are added to the carcass of 35/40 mesh,the carcass hardness is 23.4HRC,impact toughness is 2.9J/cm~2,bending strength is 903.7MPa,and wear resistance The index is 5.19E-06.The comprehensive mechanical properties of the drill matrix of this formula can meet the drilling requirements.In order to avoid the premature fall of the nearby diamond due to the rupture of the ceramic hollow ball,Ti-plated diamond was selected to be added to the matrix to improve the matrix's ability to encase the diamond and the strength of the diamond,and 50% concentration was selected to be added to the matrix.35/40 mesh Ti diamond plated.In order to verify whether the matrix with ceramic hollow balls and Ti-plated diamond matches the slippery formation,five drill bits were selected for micro-drilling test.The test results showed that the drilling speed of the drill bit with this formula was 1.5?2 times that of the diamond bit with the same diamond concentration.;and the service life is also significantly improved,which is about 1.2 times that of the diamond bit with the same diamond concentration.