A Downhole Pulse Jet Drill Bit Device

Abstract

The invention relates to an underground pulsing jet drill bit device. A double-end sleeve, a drill bit connector and a drill bit body are sequentially screwed; the upper end of the drill bit body is provided with a drill bit water cavity; a plurality of drill bit water holes are distributed in the bottom wall of the drill bit water cavity; all of the drill bit water holes are uniformly distributed by using the axial line as the center; each drill bit water hole downwards extends and is communicated with a corresponding spray hole formed in the lower end surface of the drill bit body; the center of the double-end sleeve and the center of the drill bit connector are provided with a center water passage communicated with the drill bit water cavity; a static valve disc is arranged on the bottom wall of the drill bit water cavity; static valve disc water holes are formed in the static valve disc; each static valve water hole has the same hole diameter as the drill bit water hole and is in one-to-one corresponding communication with the corresponding drill bit water hole; a movable valve disc capable of rotating around the axial line covers the static valve disc; at least one movable valve disc water hole is formed in the movable valve disc; and the movable valve disc water hole has the same hole diameter as the static valve disc water hole, and is positioned on the same circumference as the static valve disc water hole. The drill bit device has the advantages that the shaft bottom cleaning effect can be improved; and the hydraulic rock breaking capability can be improved.

Description

technical field [0001] The invention relates to a drill bit for drilling, in particular to a downhole pulse jet drill bit device, which belongs to the technical field of oil and gas drilling equipment. Background technique [0002] In the process of oil and gas drilling, jet drilling technology is to clean the bottom cuttings and assist mechanical rock breaking by generating high-speed jet at the nozzle of the drill bit, so as to achieve the purpose of increasing the mechanical penetration rate. The existing downhole drill bit device comprises a coaxial double female sleeve, a drill joint and a drill body, the lower end of the double female sleeve is screwed to the upper end of the drill joint, and the lower end of the drill joint is screwed to the upper end of the drill body. The lower end of the body is equipped with a blade, and the upper end of the drill body is provided with a drill bit water cavity extending downward along the axis. There are a plurality of drill bit w...

AI Technical Summary

Problems solved by technology

The device that actively generates pulses requires external power, and the drill bit is located thousands of meters downhole, so it is not realistic and unreliable to transmit power from the ground to the downhole, and the control of the pulse device is also very difficult

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