High-alloy and corrosion-resistant continuous oil pipe formed by high frequency induction welding and manufacturing method thereof

A high-frequency induction welding and corrosion-resistant technology, which is applied in high-frequency current welding equipment, welding equipment, metal processing equipment, etc., can solve the problems of high technical difficulty and undiscovered high-frequency induction welding of high-alloy duplex stainless steel, and achieve Good fatigue life, good resistance to uniform corrosion, and high welding efficiency

Inactive Publication Date: 2018-12-07
JASON ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high technical difficulty, there has been no public report on high-frequency induction welding of high-alloy duplex stainless steel.

Method used

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  • High-alloy and corrosion-resistant continuous oil pipe formed by high frequency induction welding and manufacturing method thereof
  • High-alloy and corrosion-resistant continuous oil pipe formed by high frequency induction welding and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A high-frequency induction welded high-alloy corrosion-resistant coiled tubing, the coiled tubing is a duplex stainless steel coiled tubing, the duplex stainless steel coiled tubing is a ferrite and austenitic duplex stainless steel, and the alloy elements of the duplex stainless steel coiled tubing are determined according to the quality In terms of fractions, it includes the following composition and components: C 0.012%, Mn 1.1%, P 0.013%, S 0.002%, Si 0.55%, Cr 22.5%, Mo 3.2%, Ni 4.8%, N 0.17%, Fe balance. It is smelted by EAF AC electric arc furnace, and then refined by VOD vacuum electric arc furnace. Through chemical composition ratio and hot rolling + solid solution treatment, a ferrite + austenite two-phase structure is obtained, wherein the ferrite content is 35%. After the pickling treatment, the finished steel coil material with a wall thickness of 0.175in was obtained. The steel coil is longitudinally cut according to the outer diameter requirement of the ...

Embodiment 2

[0038] A high-frequency induction welded high-alloy corrosion-resistant coiled tubing, the coiled tubing is a duplex stainless steel coiled tubing, the duplex stainless steel coiled tubing is a ferrite and austenitic duplex stainless steel, and the alloy elements of the duplex stainless steel coiled tubing are determined according to the quality In terms of fractions, it includes the following composition and components: C 0.01%, Mn 1.25%, P 0.017%, S 0.002%, Si 0.36%, Cr 25%, Mo 4.5%, Ni 8.0%, N 0.26%, Fe balance. It is smelted by EAF AC electric arc furnace, and then refined by AOD argon oxygen decarburization. Through chemical component distribution and hot rolling + solution treatment, a ferrite + austenite two-phase structure is obtained, wherein the ferrite content is 55%. After the pickling treatment, the finished steel coil material with a wall thickness of 0.156in was obtained. The steel coil is longitudinally cut according to the outer diameter requirement of 1.75in...

Embodiment 3

[0042] A high-frequency induction welded high-alloy corrosion-resistant coiled tubing, the coiled tubing is a duplex stainless steel coiled tubing, the duplex stainless steel coiled tubing is a ferrite and austenitic duplex stainless steel, and the alloy elements of the duplex stainless steel coiled tubing are determined according to the quality Fractional, including the following composition and components: C 0.018%, Mn 0.96%, P 0.01%, S 0.002%, Si 0.45%, Cr 30.0%, Mo 1.5%, Ni 4.5%, N 0.4%, Fe balance . It is smelted by EAF AC electric arc furnace, and then refined by VOD vacuum electric arc furnace. Through chemical composition ratio and hot rolling + solution treatment, a ferrite + austenite two-phase structure is obtained, wherein the ferrite content is 45%. After the pickling treatment, the finished steel coil material with a wall thickness of 0.156in was obtained. The steel coil is longitudinally cut according to the outer diameter requirement of the 2in pipe. After mi...

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Abstract

The invention belongs to the technical field of pipe materials for land and ocean oil and gas wells, and particularly relates to a high-alloy and corrosion-resistant continuous oil pipe formed by highfrequency induction welding. The continuous oil pipe is a ferrite and austenite duplex stainless steel continuous oil pipe, and the content of ferrite in a metallographic structure of the continuousoil pipe ranges from 35% to 55%. The continuous oil pipe is high in content of alloy elements, and can meet the application requirements of high-pressure, high-CO2 and H2S corrosion environments. Themanufactured continuous oil pipe is high in strength and long in fatigue life, and the flexible fatigue life of the continuous oil pipe can be 3-5 times that of a conventional CT90 continuous pipe.

Description

technical field [0001] The invention belongs to the technical field of pipes for land and sea oil and gas wells, and relates to a high-frequency induction welded high-alloy corrosion-resistant coiled oil pipe and a preparation method thereof. Background technique [0002] Coiled tubing is different from conventional threaded tubing. It is a single, thousands-meter-long non-joint tubing that is wound on a drum and can be run down or pulled out continuously. Coiled tubing technology is currently a relatively advanced technology in the world. Due to its low operating cost, simplicity, time-saving, safety and reliability and other superior performances, it is widely used in many fields such as sand washing, well washing, well logging, well completion, and drilling. . [0003] With the continuous development of oil and gas fields, CO 2 、H 2 S, Cl - The number of oil wells continues to increase, and the operating conditions of coiled tubing are deteriorating. However, the exi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00B23K13/02C21D9/08C21D9/50C22C38/00C22C38/02C22C38/04C22C38/44C22C38/58
CPCB23K13/025B23P15/00C21D9/08C21D9/50C22C38/001C22C38/02C22C38/04C22C38/44C22C38/58
Inventor 陈化顺蔡孝井林旭任成军王泰徐常富
Owner JASON ENERGY TECH CO LTD
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