Variable-gauge stabilizer used for well drilling

Abstract

The invention discloses a variable-gauge stabilizer used for well drilling. The variable-gauge stabilizer used for well drilling comprises an upper connector part, a stabilizer body and a lower connector part. The stabilizer body comprises a ring-shaped top wall, an outer wall, an inner wall and a ring-shaped bottom wall, and therefore a containing cavity can be formed between the ring-shaped topwall and the ring-shaped bottom wall. A liquid passing hole penetrating the top face and the bottom face of the ring-shaped top wall is formed in the ring-shaped top wall. The upper connector part comprises an upper connector body, and a pipe cavity is defined by the side wall of the upper connector body. The pipe cavity communicates with the containing cavity through the liquid passing hole. A telescopic mechanism is arranged in the containing cavity, a through hole is formed in the ring-shaped bottom wall, and the telescopic mechanism stretches out or contracted in the containing cavity through the through hole. A supporting mechanism is arranged between the telescopic mechanism and the lower connector part, and the telescopic mechanism drives the supporting mechanism to conduct supportoutwards or inward resetting. By means of the variable-gauge stabilizer used for well drilling, reactive torque supporting can be provided for an underground power drilling tool, fatigue damage of thereactive torque to a continuous pipe is reduced or eliminated, the continuous pipe is protected, and the service life of the continuous pipe is prolonged; and in addition, the drilling and mining efficiency can be improved, and the mining cost is reduced.

Description

technical field [0001] The invention relates to the technical field of oilfield drilling tools, in particular to a variable-diameter stabilizer for drilling. Background technique [0002] With the deepening of oilfield development, there are more and more ultra-deep wells and horizontal wells characterized by high torque. The traditional drilling method is to use the drill pipe to drill underground. Every time you drill down a certain distance, you must stop and continue to connect the drill pipe. Especially when encountering ultra-deep wells or horizontal wells, the cost of connecting the drill pipe is very high. More time, this method will inevitably greatly reduce the drilling efficiency. [0003] In the drilling process, in order to control the trajectory of the wellbore and prevent the well deviation, stabilizers are commonly used. When the traditional drilling tools are affected by the formation conditions and drilling construction technology, it is difficult to follo...

AI Technical Summary

Problems solved by technology

[0004] However, the diameter of the existing stabilizers is mostly fixed, which requires frequent drilling and tripping, which greatly increases the drilling cost and reduces the drilling efficiency

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