Arrangement method of carbide blades on well drilling inside cutter bit and cutter bit

Abstract

The invention discloses an arrangement method of carbide blades on a welling drilling inside cutter bit and the cutter bit. The method comprises the following steps of: surfacing a layer of tungsten carbide particle surfacing welding body (2) on a front cutter face of a cutter body (1) by utilizing a tungsten carbide welding rod; piling up the front end face of the tungsten carbide particle surfacing welding body (2) to form a rectangular plane (3); and inlaying the carbide blades on the rectangular plane (3) according to a certain rule while piling up the rectangular plane (3), wherein the inlaying depth is larger than 1 / 2 of the height C of the carbide blades. The invention adopts the carbide blades with cutting edges and the staggered pattern, the cutting edges enable the cutting resistance to be less, and the cutting speed to be improved greatly; the staggered pattern forms interruption cutting, and the cuttings are shorter so as to be easier to be brought to the ground or dropped into a well bottom, so that jamming of a drilling tool is prevented, and the cutting construction is safer and more convenient. The invention provides more convenient conditions for faster and better implementation of casing pipe replacement operation under the well.

Description

technical field [0001] The invention relates to a method for arranging cemented carbide blades on an inner drilling cutter head and the cutter head, and belongs to the technical field of geological drilling tools. Background technique [0002] In oil drilling operations, once the casing in the well is damaged, it must be replaced, the casing of the damaged section is cut off and taken out, and a new casing is inserted in the damaged section. The process of cutting the casing is: lower the mechanical or hydraulic inner cutter to the cutting position, and the cutter head rotates around the pin shaft and radially opens under the action of mechanical force or hydraulic pressure. At this time, the rotating mechanical or hydraulic inner cutter Cutting knife, the tip of the knife touches the casing, increase the mechanical force or hydraulic pressure, the tip of the knife cuts into the casing for cutting, continue to increase the mechanical force or hydraulic pressure, the tip of t...

AI Technical Summary

Problems solved by technology

The actual micro-process of cutting is the cutting of the casing wall by grinding and milling of the cemented carbide individual. The vibration is severe, and it is difficult to cut multi-layer casing. The cutting time is long, which will prolong the construction period and increase the cost.

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