Drill string pup joint for preventing annular balling by utilizing ultrasonic vibration

Abstract

The invention relates to a drill string pup joint for preventing annular balling by utilizing ultrasonic vibration. The drill string pup joint comprises an upper joint, ultrasonic vibration working heads, a pup joint main body, a lower joint and ultrasonic generators, wherein the pup joint main body is positioned between the upper joint and the lower joint, an inner sleeve is coaxially arranged on the pup joint main body, a closed interlayer is formed between the pup joint main body and the inner sleeve, a plurality of ultrasonic vibration working heads are embedded in the periphery of the outer wall of the pup joint main body, each ultrasonic vibration working head is a barrel with an opening in the bottom end, the opening end of each ultrasonic vibration working head is fixedly connected with the pup joint main body, the opening end of each ultrasonic vibration working head is located in a closed interlayer, an ultrasonic generating device is arranged in a cavity of each ultrasonic vibration working head, and an amplitude-change pole of each ultrasonic generating device is connected with the closed end of the corresponding ultrasonic vibration working head. According to the drill string pup joint, resonance effect and cavitation effect generated by ultrasonic vibration are utilized to crush rock debris and formed balling drums, and accidents such as drill jamming caused by formation of large balling drums are prevented.

Description

Technical field: [0001] The invention relates to the field of oil and natural gas drilling, and is mainly used in the drilling nipple for preventing annular mud bag in the fields of petroleum engineering, mining engineering, geotechnical engineering, etc., and specifically relates to a kind of anti-annulus mud bag using ultrasonic vibration drill string short joints. Background technique: [0002] Oil and natural gas drilling is a very important step. Drilling is a process in which a drill bit penetrates a hard formation to form a wellbore. During the drilling process, a large amount of cuttings will be produced as the drill bit grinds the formation. Drilling fluid returns to the surface from the annulus between the drill string and the borehole wall. When a large amount of cuttings accumulate in the annulus, especially large pieces of cuttings, they will form mud packets and adhere to the well wall or drill pipe when they accumulate, resulting in huge friction between the ...

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a drill string nipple utilizing ultrasonic vibration to prevent annulus bagging. This kind of drill string nipple utilizing ultrasonic vibration to prevent annulus bagging is used to solve the unsatisfactory removal effect of cuttings in the prior art. , the large pieces of cuttings cannot be broken, and the formation of mud packs can only stop drilling to eliminate the accident and then drill again.

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