Impregnated PDC bit

Abstract

The invention relates to an impregnated PDC bit. The impregnated PDC bit consists of a PDC composite sheet, a diamond-impregnated layer, a matrix, a steel core and a joint, wherein the diamond-impregnated layer, the matrix and the steel core are sintered into a bit body; a flow channel is formed on the diamond-impregnated layer and the matrix of the bit body; the PDC composite sheet is soldered in the diamond-impregnated layer or in the diamond-impregnated layer and the matrix; when 0-PDC composite sheet diameter / 3 is exposed, the composite sheet stays in a surface impregnated state; the PDC composite sheet covers the crown contour line of the bit; and the joint is connected with the bit body. The impregnated PDC bit not only keeps the advantages of high rate of penetration of PDC bits for shearing and crushing rocks, but also furthest protects the PDC composite sheet by using an impregnated structure. Meanwhile, the diamond-impregnated layer has the functions of plowing, so that the diamond content of the bit is increased, the service life is effectively prolonged and the drilling footage of the bit is improved.

Description

technical field [0001] The invention belongs to a drill bit for petroleum and geological well drilling. Background technique [0002] At present, the existing PDC drill bits have the advantages of fast mechanical penetration rate, high footage, low drilling pressure, and high applicable rotational speed in adapting to formations. They have been widely used in petroleum and geological drilling, and have brought great benefits to the drilling industry. economic and social benefits. However, because the PDC composite sheet of the PDC bit is brittle and easy to break, and there is only one layer of diamond on the front surface, the diamond content is relatively small for hard abrasive formations, resulting in relatively short life and low footage in these formations. Existing diamond-impregnated drill bits use small-grain diamonds as cutting elements. Because the diamond-impregnated layer of the drill bit is mixed with diamond particles, the diamond content is relatively high a...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problems of less footage of existing PDC drill bits and lower ROP of impregnated diamond bits in hard abrasive formations, the present invention provides a rock-shearing and breaking function, higher ROP, and impregnated diamond drill bits. The diamond layer not only protects the PDC composite sheet to the greatest extent, but also increases the diamond content, so the drill bit has a higher service life and footage

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