Helical tooth ladder bottom-spraying type diamond bit

Abstract

The invention relates to a helical tooth ladder bottom-spraying type diamond bit comprising a drilling bit steel body and a diamond working layer installed on one end part of the drilling bit steel body; the drilling bit steel body has a tubular structure on the whole; the diamond working layer is installed at the tube end of the drilling bit steel body and has a cone structure on the whole; a cone-type end of the diamond working layer is provided with a rock core inlet; the surface where buses of the diamond working layer are positioned is provided with right-handed screw fan-shaped blocks; multiple fan-shaped blocks are installed in the circumferential direction of the diamond working layer with intervals; the total projection area of the fan-shaped blocks is less than 40% of the projection area of a bit bottom lip part; a fan-shape recess is formed between two fan-shaped blocks; the bottom of each of the fan-shape recess is provided with a water spray hole; the water spray hole is communicated with a tube chamber of the drilling bit steel body. The lip powder discharging and cooling performance of the diamond bit is improved. The helical tooth ladder bottom-spraying type diamond bit has high drilling efficiency and long drilling bit service life.

Description

technical field [0001] The invention relates to the technical field of geological core drilling, and can also be used in the field of oil and natural gas drilling and core drilling, in particular to a helical-tooth stepped bottom spray diamond drill bit. Background technique [0002] In the process of geological core drilling, generally small-diameter drilling methods are used. The lip of the diamond core bit used for drilling is generally thin, and the lip thickness is generally 10-15mm. Drilling parameters with low pressure and low pump volume. For large-diameter diamond drilling, the parameters of low speed, high pressure, and large pump volume are used for drilling. The lip of the diamond core bit is relatively thick, generally more than 30mm. The lip of the traditional diamond bit contacts the rock area too much. When drilling, it needs to add a lot of drilling pressure to meet the requirements of rock extraction. However, when the pressure of the drill bit increases,...

AI Technical Summary

Problems solved by technology

For large-diameter diamond drilling, the parameters of low speed, high pressure, and large pump volume are used for drilling. The lip of the diamond core bit is relatively thick, generally more than 30mm. The lip of the traditional diamond bit contacts the rock area too much. Large, it needs to add a lot of drilling pressure when drilling to meet the requirements of rock extraction

However, when the pressure of the drill bit increases, the torque of the drill string will increase, and the drill pipe is easy to break; under the condition of low speed, the rock breaking efficiency is low; at the same time, the wall of the drill bit lip is thick, and the center of the bottom lip of the drill bit often has poor water flow. It is easy to cause micro-burning and carbonization of diamond, and the service life of the drill bit is low

Therefore, the traditional large-diameter thick-walled diamond bit lip structure has many deficiencies in drilling

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