Stagnation-prevention drilling tool capable of reducing stick slip phenomenon through multi-head helical pair

Abstract

The invention relates to a stagnation-prevention drilling tool capable of reducing a stick slip phenomenon through a multi-head helical pair. The stagnation-prevention drilling tool is installed on the upper portion of a drill bit in a thread connection mode and comprises an upper assembly, a vibration absorption assembly and a lower assembly. The rear end of the vibration absorption assembly is provided with an upper connector assembly, and the front end of the vibration absorption assembly is provided with the lower assembly. Vibration generated in the work process of the tool is absorbed through disc springs connected in series, a pressure cavity and a rubber spring. Through matching of a spiral outer shell and a spiral transmission shaft, the multi-head helical pair is formed. When the reaction torque acting on the drill bit is increased and a stick slip or clamping phenomenon occurs, the spiral transmission shaft rotates backwards relative to the spiral outer shell, and therefore small-amplitude reverse rotation is applied to the drill bit. The reaction force of the ground to the drill bit is lowered, stress of the drill bit reaches balance again, and therefore efficient rock breaking with the drill bit is realized. According to the stagnation-prevention drilling tool capable of reducing the stick slip phenomenon through the multi-head helical pair, the vibration generated during rock breaking with the drill bit can be absorbed, the stick slip phenomenon is reduced, and continuous drilling of the drill bit is guaranteed.

Description

technical field [0001] The invention belongs to the field of petroleum and natural gas drilling engineering and relates to a novel downhole drilling tool, in particular to an anti-stagnation drilling tool capable of reducing stick-slip through a multi-head screw. Background technique [0002] At present, oil and gas exploration and development have entered a bottleneck state. The development of conventional oil and gas fields has gradually entered the later stage. Global oil and gas development has gradually shifted to unconventional oil and gas development, gradually shifting from shallow to deep and ultra-deep layers, and from land to ocean development. With the changes in the mining environment of oil and gas fields, the requirements for their mining modes and technologies are getting higher and higher. Compared with the development of conventional oil and gas fields, the difficulty of oil and gas extraction in deep, ultra-deep oil and gas and complex geological structures...

AI Technical Summary

Problems solved by technology

[0003] In the process of oil and gas drilling, especially the drilling process, due to the complex working environment of the drill bit, its force also changes irregularly with the increase of the drilling depth. Through the drill bit, the formation reaction force is transmitted to the upper drilling tool assembly. The regular formation reaction force will have a huge impact on the working performance of drilling tools and bring inconvenience to drilling operations

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