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High-performance corrosion-resistant economic composite steel coiled tubing and manufacturing method thereof

A composite steel material and manufacturing method technology, applied in the direction of rigid pipe, pipe, pipeline protection, etc., can solve the problem that the coiled tubing cannot fully meet the economic, efficient, safe and reliable operation requirements, and the performance cannot fully meet the field operation requirements of the coiled tubing. Unable to withstand pressure loads and other problems, to achieve the effect of solving insufficient corrosion resistance, good plasticity and toughness, and low cost

Inactive Publication Date: 2017-09-08
JASON ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing coiled tubing can no longer fully meet the economical, efficient, safe and reliable operation requirements of coiled tubing
Conventional low-grade coiled tubing (CT70, CT80, CT90) is subject to various corrosion effects such as pitting corrosion, stress corrosion, CO2, Cl-, SSC, HIC, etc. due to material limitations, and frequent on-site fracture accidents; CT100 and above High-grade high-strength coiled tubing, although it has good fatigue resistance, its corrosion resistance is seriously reduced with the increase of strength grade, and its hardness exceeds the hydrogen sulfide resistance requirements of the NACE MR0175 standard of the American Corrosion Association (hardness shall not exceed 22HRC) , poor corrosion resistance, especially not applicable to the environment containing hydrogen sulfide; although other stainless steel coiled tubing and titanium alloy coiled tubing have basic corrosion resistance, but the manufacturing cost is relatively high (generally 3-8 times that of carbon steel coiled tubing) ), it is difficult to promote the application on a large scale
In recent years, the newly researched composite coiled tubing is made of braided fiber material, which is also expensive to manufacture, and it cannot withstand pressure loads, and its performance cannot fully meet the field operation requirements of coiled tubing.

Method used

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  • High-performance corrosion-resistant economic composite steel coiled tubing and manufacturing method thereof
  • High-performance corrosion-resistant economic composite steel coiled tubing and manufacturing method thereof
  • High-performance corrosion-resistant economic composite steel coiled tubing and manufacturing method thereof

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specific Embodiment

[0045] Please refer to Figure 1-3 As shown, a high-performance corrosion-resistant economical composite steel coiled tubing includes a base layer 1 and a composite layer 2, and the base layer 1 and the composite layer 2 are metallurgically combined; wherein the base layer 1 is a carbon steel or low alloy steel layer, The composite layer 2 is a corrosion-resistant alloy layer. The composite layer 2 is arranged on the inner or outer surface of the base layer 1 to form a single-layer composite coiled tubing. The composite layer 2 is arranged on the inner surface and the outer surface of the base layer 1 to form an inner and outer composite layer coiled tubing.

[0046] Each component and mass percentage in the base layer 1 are as follows:

[0047] C 0.06%-0.23%, Mn 0.5%-2.1%, P≤0.02%, S≤0.005%, Si 0.15%-0.5%, Cr 0.35%-1.6%, Mo 0.02%-0.3%, Ni 0.05%-0.97 %, Cu 0.1%-0.5%, Nb+Ti+V≤0.2%, Fe balance.

[0048] The composite layer 2 is an austenitic stainless steel layer, and the co...

Embodiment 1

[0070] A method for manufacturing high-performance corrosion-resistant economical composite steel coiled tubing. The coiled tubing includes an inner base layer and an outer layer composite tube of an outer composite layer. According to the chemical composition requirements of the coiled tubing base material, the coiled tubing is smelted in an electric furnace (EF), Ladle refining (LF) and vacuum degassing (VD) are used to smelt, precisely control the chemical composition of molten steel, reduce harmful non-metallic elements and inclusions, and carry out continuous production through mold electromagnetic stirring technology, mold non-sinusoidal vibration technology, and light reduction technology. Cast billets, through controlled rolling and controlled cooling technology, to obtain low-carbon low-alloy steel coils with excellent microstructure and grain size ASTM Grade12. According to mass percentage, its specific chemical composition is as follows: C 0.08%, Mn 0.75%, P 0.010%, ...

Embodiment 2

[0074] A method for manufacturing high-performance, corrosion-resistant and economical composite steel coiled tubing. The coiled tubing includes a base layer and an inner and outer layer composite tube of an inner and outer composite layer. According to the chemical composition requirements of the coiled tubing base material, the coiled tubing is smelted in an electric furnace (EF), ladle Refining (LF) and vacuum degassing (VD) smelting, precise control of the chemical composition of molten steel, reducing harmful non-metallic elements and inclusions, continuous casting through mold electromagnetic stirring technology, mold non-sinusoidal vibration technology, and light reduction technology After being formed into billets, low-carbon low-alloy steel coils with good microstructure and grain size of ASTM Grade13 are obtained through controlled rolling and controlled cooling technology. According to mass percentage, its specific chemical composition is as follows: C 0.12%, Mn 0.87...

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Abstract

The invention relates to high-performance corrosion-resistant economic composite steel coiled tubing and a manufacturing method thereof. The high-performance corrosion-resistant economic composite steel coiled tubing comprises a base layer and a composite layer, wherein the base layer and the composite layer are in metallurgical bonding; the base layer is a carbon steel layer or a low alloy steel layer; the composite layer is a corrosion-resistant alloy layer; and the composite layer is arranged on the inner surface or the outer surface of the base layer. The high-performance corrosion-resistant economic composite steel coiled tubing is high in strength, good in plasticity and toughness, corrosion resistant in use and good in economy.

Description

technical field [0001] The invention relates to the technical field of pipes for land and sea oil and gas wells, in particular to a high-performance corrosion-resistant economical composite steel coiled oil pipe and a manufacturing 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, there are more and more ultra-deep, high temperature, high pressure, high water content, and highly corrosive oil wells, and the operating condit...

Claims

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Application Information

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IPC IPC(8): F16L9/02F16L58/08C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/58C22C38/04C22C38/02B23P15/00
Inventor 蔡孝井陈化顺任成军林旭闫光
Owner JASON ENERGY TECH CO LTD
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