Churn screw drill for drilling

Abstract

The invention provides a churn screw drill for drilling. The churn screw drill for drilling comprises a bypass valve assembly, an anti-falling assembly, a motor assembly, a universal shaft assembly and a transmission shaft assembly, wherein the universal shaft assembly comprises a universal shaft assembly housing and a universal shaft; the transmission shaft assembly comprises a water cap and a transmission shaft; the universal shaft, the water cap and the transmission shaft are sequentially connected through screw threads; a main liquid delivery hole is formed in the center of the water cap; a plurality of water cap liquid inflow holes which are evenly distributed in a circular array mode and communicate with the main liquid delivery hole are formed in the side face of the water cap; a liquid delivery channel communicating with the lower end of the main liquid delivery hole is arranged in the center of the transmission shaft; a stop baffle is installed on the inner side of the universal shaft assembly housing; and the water cap liquid inflow holes are covered with the stop baffle when rotated to the stop baffle, so that the total liquid inflow area of the water cap is decreased. The churn screw drill for drilling has the beneficial effects that through the design, torsion and rotation speed of the motor assembly can be periodically changed, thus, a motor can generate continuous torsion while high-frequency low-amplitude torsion impact shock is transferred to a drill bit, and accordingly the jamming and slippage phenomena of the drill bit are avoided.

Description

technical field [0001] The invention relates to the technical field of drilling tools, in particular to a rotary percussion screw drilling tool for drilling. Background technique [0002] With the continuous development of oil and gas exploration and development, the proportion of deep wells and ultra-deep wells in oil and gas fields to the entire oil and gas wells continues to increase. However, the formation rocks in deep wells have high strength, high abrasiveness, and poor drillability, resulting in serious drill tool bounce, which eventually leads to slow drilling speed, long drilling cycle, and increased drilling costs. In addition, when the rock-breaking ability of the drill bit is insufficient, the drill bit that eats the rock stops rotating instantly, and the drill string rotates until the energy accumulated at the drill bit reaches the critical value of shearing and breaking the formation. The entire drill string enters a "stick-slip" cycle. The appearance of the...

AI Technical Summary

Problems solved by technology

The appearance of the "card-slip" phenomenon directly causes irregular vibration, and a much higher impact load than usual is applied to the PDC (Polycrystalline Diamond Compact bit) bit teeth, resulting in premature failure of the bit and shortening the BHA (bottom hole assembly ) service life of the bottom hole assembly, which will ultimately affect the wellbore quality

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