Preparation method for hydraulic pressure composite thermometal oil pipe

Abstract

The invention relates to a preparation method for a hydraulic pressure composite thermometal oil pipe. A carbon steel outer pipe is subjected to abrasive blasting and derusting, and the cleaning of the inner surface of the carbon steel outer pipe and the outer surface of a stainless steel inner pipe is ensured; the inner pipe penetrates into the outer pipe, and hydraulic pressure composite is conducted through a hydraulic press after the penetration is completed; the carbon steel outer pipe is made to deform elastically and the stainless steel inner pipe is made to deform plastically in the composite process, so that the inner pipe and the outer pipe are made to combined closely. After the composite process, pipe end machining is conducted before welding, and eddy current inspection is conducted on the whole oil pipe after the pipe end machining is completed; if the oil pipe is qualified through the inspection, the two pipe ends are subjected to bead welding which is completed through an automatic welder, and the bonding strength of the pipe ends are ensured. Pipe end heat treatment is conducted for removing the residual stress of the welding after the welding is completed. After the stress is removed, coping of a screened pipe and turning of threads are conducted, and inspection is conducted after the turning of threads is completed. Coupling and path opening are conducted after the oil pipe is qualified. The whole inner surface of the product prepared through the preparation method is corrosion resistant, and the corrosion-resistance strength is high; the outer pipe ensures that the strength of the composite oil pipe is enough, so that the stainless steel composite oil pipe has the characteristics of anticorrosion and abrasion resistance. Besides, the cost is low and the service life is long.

Description

technical field [0001] The invention relates to a method for preparing a stainless steel bimetal composite oil pipe used in an oil field, in particular to a method for preparing a hydraulic composite bimetal oil pipe, wherein the outer pipe is made of carbon steel and the inner pipe is made of stainless steel. tubing. Background technique [0002] In recent years, there have been many oil pipe and casing damage accidents in oilfields across the country, resulting in huge economic losses. One of the main causes of tubing and casing damage is internal corrosion. The use of stainless steel can prevent corrosion and perforation of oil pipes and casings, but the price is particularly expensive. At present, due to price issues and excessive one-time investment, stainless steel casings are rarely used in domestic oil fields, and only a small part of stainless steel oil pipes are used in individual oil fields. Therefore, it is very necessary and urgent to study oil pipes and casi...

AI Technical Summary

Problems solved by technology

The use of stainless steel can prevent corrosion and perforation of oil pipes and casings, but the price is very expensive

At present, due to the problem of price and excessive one-time investment, domestic oil fields rarely use stainless steel casing, and some oil fields only use a small part of stainless steel tubing

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