Grinding and casing milling workover tools manufacturing technology and mold

Abstract

The invention discloses a manufacturing process of a grinding, casing milling and well repairing tool. Firstly, a to-be-machined casing is sleeved with a mold, the end portion of the mold is provided with inner edges extending towards the axis, and gaps are reserved between the inner edges and the end face of the to-be-machined casing; after the to-be-machined casing and the mold are preheated to a surfacing temperature, the end face of the to-be-machined casing is coated with soldering flux, and surfacing of priming weld layers is started; YD hard alloy particles are subjected to horizontal surfacing in the gaps; and after the surfacing is completed, the mold is dismantled, the welded tool is subjected to postwelding heat preservation and is cooled after heat preservation is performed for a period of time, and welding is completed. A filling material can flow in the gaps between the mold and the casing due to the welding manner, the particles are distributed evenly to achieve the purpose of the horizontal surfacing, the above welding temperature is stable, the temperature loss is avoided as much as possible, the welding strength and the welding efficiency are improved, and therefore the impact toughness, the abrasion resistance, the service life and other indexes of the tool are improved. The invention discloses the mold for manufacturing the grinding, casing milling and well repairing tool at the same time.

Description

technical field [0001] The invention relates to a series of milling and casing milling tools for oil field workover operations, in particular to a manufacturing process of the grinding and milling and casing milling tools. Background technique [0002] Grinding and milling are two commonly used processes in oil field workover operations. In the process of oil field production, for example, when the well pipe string and tools are buried by sand or cemented, the packer or bridge plug is stuck, the downhole casing is deformed or broken, etc., milling and casing milling are required during processing . In order to save cost, the conventional sleeve milling head and grinding shoe are usually welded by the main body made of ordinary metal and the cutter head made of YD alloy. However, due to the problems in the existing manufacturing process, the grinding and sleeve milling tools If the welding strength is not enough, it may collapse and fall off after long-term work, and the se...

AI Technical Summary

Problems solved by technology

[0003] Therefore, the technical problem to be solved by the present invention is the problem of short service life due to insufficient welding strength of grinding and milling tools, and further provides a manufacturing process that can improve the service life of grinding and milling tools

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