Equal flow pulse jet drilling bit device and design method thereof

Abstract

The invention relates to an equal flow pulse jet drilling bit device and a design method thereof. A plurality of bit ports are distributed in the bottom wall of a drilling bit water cavity at the upper end of a drilling bit body. All the bit ports are respectively extended downwards, and respectively communicated with spray orifices in the lower end face of the drilling bit body. A static valve disc is installed on the bottom wall of the drilling bit water cavity. The static valve disc is provided with static valve disc water holes. The hole diameter of all the static valve disc water holes is as same as that of all the bit ports. All the static valve disc water holes respectively run through the bit ports in one-to-one correspondence mode. A movable valve disc covers above the static valve disc. The movable valve disc is provided with movable valve disc water holes. When the movable valve disc rotates, the open area of the movable valve disc water holes and the static valve disc water holes along the axial direction is constant value. The static valve disc water holes are round holes. The movable valve disc water holes are annular sector holes. The radial distance of the annular sector holes is as same as the hole diameter of the static valve disc water holes. The center of a center circle of the annular sector holes and the circle center of the static valve disc water holes are located on the same circumference. The equal flow pulse jet drilling bit device can improve bottom hole cleaning effects and hydraulic drilling ability, and can guarantee stable running status of a high pressure pump.

Description

technical field [0001] The invention relates to a drill bit for drilling, in particular to an equal-flow pulse jet drill bit device; the invention also relates to a design method of an equal-flow 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. With the improvement of the quality of the drill bit and the life of the bearing, the drilling speed and stroke drilling speed of the drilling tool have been greatly improved; the continuous jet drill bit used in large quantities, each drill bit has a uniform flow, and the flow rate of the injected impact fluid is low. less, the drilling efficiency is severely limited. The pulse jet drill b...

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Problems solved by technology

[0007] In the above patents, the flow field of the jet at the bottom of the drill bit is well-proportioned, and the equal-flow pulse jet has not been realized.

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