PDC (Polycrystalline Diamond Compact) drilling head with dynamic stress interference principle

Abstract

The invention provides a PDC drilling head with a dynamic stress interference principle. The PDC drilling head comprises a drilling head body and at least two cutter wings, wherein the cutter wings and the drilling head body are fixedly connected or are molded integrally, the drilling head is provided with mixed cutting units composed of PDC teeth and impact teeth, the PDC teeth and the impact teeth in the mixed cutting units are arranged on two adjacent cutter wings correspondingly, the impact teeth can generate impact motions, in the mixed cutting units, the positional relation between the PDC teeth and the impact teeth is constructed to be in the peripheral direction formed by drilling head rotating, the PDC teeth are arranged behind the impact teeth, furthermore, the range of the distance D between the PDC teeth and the impact teeth is that the D is larger than or equal to d and less than or equal to 4d, and the d is the diameter of the PDC teeth. By means of the PDC drilling headwith the dynamic stress interference principle, the problems of the poor cutting tooth intrusion ability, the low rock breaking efficiency and the short drilling head working life in hard formation drilling of the drilling head can be solved.

Description

technical field [0001] The invention relates to technical fields such as petroleum and natural gas drilling engineering, mining engineering, geological drilling, tunnel engineering, etc., and specifically relates to a PDC drill bit with the principle of dynamic stress interference. Background technique [0002] The drill bit is a tool that directly contacts the rock during the drilling process and breaks the rock through cutting and impacting. PDC (Polycrystalline Diamond Compact) drill bits, as an important type of existing drill bit technology, are more and more widely used in oil drilling, geology and even construction engineering. The PDC bit is used to break the rock mainly by cutting through the PDC teeth set on the bit. In soft to medium hard formations, it can obtain ideal drilling speed and has been widely used in oil and gas drilling. [0003] With the exhaustion of shallow oil and gas resources, the focus of oil and gas exploration and development has gradually s...

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a PDC drill bit with the principle of dynamic stress interference to solve the problems existing in the prior art: in drilling hard formations, the PDC teeth have poor penetration ability, low rock breaking efficiency and short working life of the drill bit.

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