Step-by-step adjustable borehole finisher

Abstract

The invention provides a step-by-step adjustable borehole finisher, and belongs to the technical field of petroleum operation equipment. The step-by-step adjustable borehole finisher is composed of anupper joint, a shell and a lower joint which are sequentially connected in a threaded mode; a core shaft is arranged in the shell, and an upper cover, an outer-diameter adjusting assembly, a disc spring rear cover, a cutter body assembly and a piston assembly are sequentially mounted on the periphery of the core shaft from top to bottom; and the outer-diameter adjusting assembly is sleeved with adisc spring at the upper end of the core shaft, and the periphery of the disc spring is sequentially sleeved with a third-stage disc spring tube, a second-stage disc spring tube and a first-stage disc spring tube from top to bottom. The step-by-step adjustable borehole finisher is novel and reasonable in structural design and convenient to use and operate, the outer diameter of a tool can be adjusted, the needs for finishing the well wall and enlarging the well diameter can be met, during gypsum-salt layer well drilling, the well wall can be repaired midway, then drilling continues being conducted, the problem that at present, the function cannot be achieved through similar tools is solved, and the higher operation requirement is met.

Description

technical field [0001] The invention belongs to the technical field of petroleum operation equipment, in particular to a step-by-step adjustable borehole trimmer. Background technique [0002] During the drilling process, sometimes it is necessary to repair the well wall and expand the well diameter, but the outer diameter of the conventional well diameter expansion tool is not variable, and the well diameter below the technical casing cannot be repaired and expanded, and some of them cannot be adjusted. diameter size, and sometimes due to the large diameter expansion, large rock blocks fall to the drill bit and accumulate, causing complicated downhole accidents such as drill sticking. In gypsum-salt layer drilling, it is often necessary to repair the borehole wall halfway, and then resume drilling, which cannot be realized by similar tools at present. Contents of the invention [0003] The present invention aims at overcoming the deficiency of the prior art, and provides...

AI Technical Summary

Problems solved by technology

[0002] During the drilling process, sometimes it is necessary to repair the well wall and expand the well diameter, but the outer diameter of the conventional well diameter expansion tool is not variable, and the well diameter below the technical casing cannot be repaired and expanded, and some of them cannot be adjusted. diameter size, and sometimes due to the large diameter expansion, large rocks in the well diameter will fall to the drill bit and accumulate, causing complicated downhole accidents such as drill sticking

In gypsum-salt layer drilling, it is often necessary to repair the wellbore halfway, and then resume drilling. Currently, similar tools cannot achieve this function

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