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Coiled tubing with on-line continuous production and dynamically adjustable performance and preparation method thereof

A technology for oil tubing and performance, which is applied in the field of coiled tubing and its preparation, can solve the problems of increasing the cost of raw materials, reducing the inner diameter of the coiled tubing and liquid pumping capacity, sacrificing the overall strength and fatigue life of the coiled tubing, and achieving the elimination of bad tissue and durability Excellent corrosion performance and good fatigue life

Active Publication Date: 2020-04-14
JASON ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to balance the bearing capacity of the entire coiled tubing, variable-diameter coiled tubing is now mostly used, and the purpose of increasing the bearing capacity is achieved by increasing the wall thickness near the wellhead. Obviously, this method will inevitably reduce the inner diameter of the coiled tubing. and liquid pumping capability, and will lead to a substantial increase in raw material costs
In addition, when encountering a well section with a harsh corrosive environment, usually the overall strength and fatigue life of the coiled tubing can only be sacrificed to meet the corrosion resistance performance requirements of the product.

Method used

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  • Coiled tubing with on-line continuous production and dynamically adjustable performance and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] According to mass percentage, the chemical composition of the steel used in this embodiment is C 0.17%, Mn 1.5%, P 0.01%, S 0.003%, Si 0.33%, B 0.0005%, and Fe balance. Through microalloying, adding Nb, V or Ti alloying elements, hot rolling to obtain a ferrite + pearlite balance structure with a grain size of 13, after rolling, the steel coil is sheared to obtain a 2.000in*0.175in continuous pipe steel belt.

[0037] Cut the end of the steel strip obliquely at 45° and process I-shaped bevel, and assemble it to prepare for welding. The steel strip welding is completed by plasma welding. After welding, the welding seam reinforcement is removed by grinding, and the welding seam is heated to 550 ° C and air-cooled. Post-weld heat treatment. Complete the butt joint of all steel strip welds according to the above process, and obtain a steel strip with a total length of 4300m.

[0038] The steel strip with a length of 4300m enters the pipe making unit at a speed of 12m / min ...

Embodiment 2

[0043] According to mass percentage, the chemical composition of the steel used in this embodiment is C 0.22%, Mn 1.2%, P 0.01%, S 0.002%, Si 0.15%, Mo 0.25%, B 0.0007%, and Fe balance. Through microalloying, adding Nb, V or Ti alloying elements, hot rolling to obtain a ferrite + pearlite balance structure with a grain size of 13, after rolling, the steel coil is sheared to obtain a 2.000in*0.204in continuous pipe steel belt. Cut the end of the steel strip obliquely at 45° and process I-shaped groove, and assemble it to prepare for welding. TIG welding is used to complete the welding of the steel strip. After welding, the welding seam reinforcement is removed by grinding, and the welding seam is heated to 480°C and air-cooled. Post-weld heat treatment. Complete the butt joint of all steel strip welds according to the above process, and obtain a steel strip with a total length of 3600m.

[0044] The steel strip with a length of 3600m enters the pipe making unit at a speed of ...

Embodiment 3

[0049] According to the mass percentage, the chemical composition of the steel used in this example is C 0.33%, Mn 1.8%, P0.02%, S 0.005%, Si 0.5%, Mo 0.20%, Cr 1.4%, Ni0.05%, Fe balance . Through microalloying, adding Nb, V or Ti alloying elements, hot rolling to obtain a ferrite + pearlite balance structure with a grain size of 14, after rolling, the steel coil is sheared to obtain a 2.000in*0.156in continuous pipe. steel belt. Cut the end of the steel strip obliquely at 45° and process I-shaped groove, and assemble it to prepare for welding. The steel strip is welded by MIG welding. After welding, the welding seam reinforcement is removed by grinding, and the welding seam is heated to 960°C and air-cooled. Post-weld heat treatment. Complete the butt joint of all steel strip welds according to the above process, and obtain a steel strip with a total length of 5500m.

[0050] The steel strip with a length of 5500m enters the pipe making unit at a speed of 14m / min from the ...

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Abstract

The invention relates to the technical field of tubing for an oil-gas well in land and sea, in particular to coiled tubing with online continuous production and dynamically-adjustable performance. Thecoiled tubing comprises 0.17%-0.33% of C, 1.2%-1.8% of Mn, less than or equal to 0.02% of P, less than or equal to 0.005% of S, 0.15%-0.5% of Si, and the balance Fe. The coiled tubing with online continuous production and dynamically-adjustable performance breaks the limitation of factors such as raw materials and welding lines to the performance of the coiled tubing, at the same time, in order to meet the requirements for loading capacity and corrosion resistance of the coiled tubing under different working conditions, the coiled tubing with the uniform structure and performance of welding lines and parent materials, high intensity, good fatigue life, good corrosion resistance and good economy is developed.

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 coiled oil pipe with on-line continuous production and dynamically adjustable performance 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. . With the increasing difficulty of oil and gas field exploitation, deep wells, high pressure wells, and highly corrosive environments are gradually increasing. High strength, high fatigue life, large pip...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/12C22C38/44C22C38/58C21D9/08C21D9/50B23P15/00
CPCB23P15/00C21D9/08C21D9/50C21D2211/005C21D2211/009C22C38/002C22C38/02C22C38/04C22C38/12C22C38/44C22C38/58
Inventor 蔡孝井任成军陈化顺林旭王泰
Owner JASON ENERGY TECH CO LTD
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