The ways to increase the intensity of rock destruction using diamond crown bits

Abstract

Diamond drilling with the use of both natural and synthetic diamonds and their compositions in complex geological conditions accompanied by abnormal wear of the rock cutting tool and insufficiently effective utilization of the energy supplied to the slaughter. Study of regularities in the formation stresses in the rock cutting tool at the interface it with the rock during drilling and distribution of these stresses will provide an idea of the concentration and, as a consequence, the wear patterns of the matrix of the diamond crown. This article presents the study results of contact stresses in the matrix impregnated crown bits of trapezoidal and truncated hemisphere profile shapes using a three-dimensional photoelasticity methods. The results of previous theoretical studies on the distribution of unit loads on the profile matrix impregnated bit were confirmed. The necessity to equip the most stressed parts of the drill crown bit profile matrix was grounded. The possibility to change rock cutting intensity with a diamond tool by using different matrix materials for hardness was proved. Results of comparative tests in a production environment of impregnated crown bits of different profiles equipped with wear resistant materials in the most highly stressed end portions of the matrix, and the bits with different degrees of hardness of the matrix material were presented.