Anti-stagnation tool based on flexible rods

Abstract

The invention discloses an anti-stagnation tool based on flexible rods and belongs to the field of drilling of ultra-deep petroleum wells. By the adoption of the anti-stagnation tool based on the flexible rods, the problem that the rock breaking efficiency is lowered due to the fact that a drill bit gets stuck or slides in the drilling process is solved. According to the main technical scheme, a vibration reduction assembly, an upper shell, a middle shell and a lower shell are connected in sequence through threads; the lower end of a combined disc spring pushes an anti-falling pipe to make a central pipe stretch, and the anti-falling pipe is positioned in the axial direction through an upper connector shaft shoulder of the middle shell; a flexible rod system rotates leftwards, and the upper end and the lower end of the flexible rod system are fixed in circular grooves in the lower end of the middle shell and the upper end of a central pipe boss correspondingly; the flexible rods are installed in the way that the upper ends and the lower ends of the flexible rods are inclined by 30-40 degrees and are in the stretching state initially; during operation, the drilling pressure is transmitted to the central pipe through the combined disc spring, and the torque is transmitted to the central pipe through the flexible rod system; and when the central pipe rotates reversely, the flexible rod system contracts, the combined disc spring is compressed by the central pipe to contract in the axial direction to reduce the cutting depth of the drill bit, and the drill bit is in a rock stratum all the time in the whole process.

Description

technical field [0001] The invention relates to an anti-sluggish tool based on a flexible rod used in the fields of oil and gas ultra-deep wells and extended-reach drilling. Background technique [0002] In recent years, with the continuous development of my country's industry, the demand and extraction of oil and natural gas are also increasing. However, this situation has led to the depletion of a large number of shallow oil and gas resources. In order to alleviate the shortage of oil resources in our country, people began to exploit oil in areas with severe environmental conditions such as deep wells and ultra-deep wells. However, according to the situation at the mining site, it is shown that in the process of drilling ultra-deep wells, extended-reach wells, and horizontal wells, the PDC bit is prone to slippage during the drilling process, especially when encountering soft and hard formations, causing the bit and the drill bit to slip. The frequent holding jump and to...

AI Technical Summary

Problems solved by technology

However, according to the situation at the mining site, it is shown that in the process of drilling ultra-deep wells, extended-reach wells, and horizontal wells, the PDC bit is prone to slippage during the drilling process, especially when encountering soft and hard formations, causing the bit and the drill bit to slip. The frequent jumping and torsional vibration of the tool will lead to chipping and damage of the drill bit, and damage to the downhole drilling tool assembly, which will reduce the mechanical penetration rate of the bit and the rock breaking efficiency, and increase the drilling cost

In order to deal with this phenomenon, most of the current drilling sites use the method of drilling to solve the phenomenon of drill sticking and drilling, because the drilling efficiency will be greatly reduced with the increase of the number of tripping

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