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J55-steel-grade SEW expandable casing tube and manufacturing method thereof

A technology of expansion casing and manufacturing method, which is applied in non-API oil casing, new J55 steel grade SEW expansion casing, alloy design and manufacturing, can solve the problem of inability to ensure weld performance, complex heat treatment process, and unfavorable scale Problems such as production and product promotion, to achieve the effect of uniform deformation performance of the economy as a whole, avoiding energy consumption and cost increase, and broad-scale application prospects

Active Publication Date: 2015-08-12
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

20G seamless pipe has high plasticity, but low dimensional accuracy, poor strength and toughness (Charpy impact absorption energy of full-size sample at 0°C ≤ 10J), especially the low impact toughness makes it suitable for transportation, hoisting, installation and service, etc. The ability to resist impact loads during the process is poor, and it is easy to produce microcracks under the action of impact, which will lead to cracks or even fractures during the service process, and there are large safety hazards; although the traditional J55 steel grade HFW welded pipes have high dimensional accuracy, but due to the weld seam The microstructure and properties of the base metal are quite different, and it is difficult to ensure the goal of uniform deformation as a whole, resulting in severe bending of the pipe along the weld after expansion, which seriously affects the performance of the product
The high alloy composition and the use of precious metals not only increase the cost, but also increase the carbon equivalent of the material virtually, which affects the weldability of the pipe, and cannot ensure 100% weld performance without any defects, which in turn causes the steel pipe to expand during the expansion process. It is very easy to crack along the weld and fail to go down the well, which has a major hidden danger in safe operation
The second is that the heat treatment process is complicated and the energy consumption is high
In order to achieve the goal of organizational regulation, the multi-pass off-line heat treatment process for steel pipes will significantly increase energy consumption and manufacturing costs, which is not conducive to large-scale production and product promotion

Method used

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  • J55-steel-grade SEW expandable casing tube and manufacturing method thereof
  • J55-steel-grade SEW expandable casing tube and manufacturing method thereof
  • J55-steel-grade SEW expandable casing tube and manufacturing method thereof

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Experimental program
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Effect test

Embodiment 1

[0016] The chemical composition of the hot-rolled steel coil in this embodiment is (mass percentage, %): C 0.06, Si 0.22, Mn 1.16, Cr 1.07, B 0.0008, P 0.014, S 0.004, and the balance is Fe.

[0017] The production steps are as follows: First, the hot-rolled steel coil with the above composition is subjected to slitting, edge milling, roll forming and high-frequency resistance welding to make a welded parent pipe with an outer diameter of Φ193.7mm and a wall thickness of 7.8mm; secondly , the HFW welded parent pipe is rapidly heated to 1010°C by an intermediate frequency induction heating furnace, and then enters the multi-roller unit for thermal tension reduction of the entire pipe body, and a thermally reduced pipe with an outer diameter of Φ139.7mm and a wall thickness of 8.15mm is obtained. billet; finally, the heat-stretched and reduced tube billet, which is still at a high temperature of about 825°C, is quickly cooled to 360°C by an on-line control cooling device, and the...

Embodiment 2

[0020]The chemical composition of the hot-rolled steel coil in this embodiment is (mass percentage, %): C 0.11, Si 0.17, Mn 1.12, Cr 0.52, B 0.0011, P 0.008, S 0.002, and the balance is Fe.

[0021] The production steps are as follows: First, the hot-rolled steel coil with the above composition is subjected to slitting, edge milling, roll forming and high-frequency resistance welding to make a welded parent pipe with an outer diameter of Φ193.7mm and a wall thickness of 7.34mm; secondly , the HFW welded main pipe is rapidly heated to 995°C by an intermediate frequency induction heating furnace, and then enters the multi-roller unit for thermal tension reduction of the entire pipe body, and a thermally reduced pipe with an outer diameter of Φ139.7mm and a wall thickness of 7.72mm is obtained. Billet; finally, the heat-stretched and reduced tube billet, which is still at a high temperature of about 810°C, is quickly cooled to 390°C by an on-line control cooling device, and then a...

Embodiment 3

[0024] The chemical composition of the hot-rolled steel coil in this embodiment is (mass percentage, %): C 0.18, Si 0.25, Mn 1.28, Cr 0.31, B 0.0006, P 0.005, S 0.002, and the balance is Fe.

[0025] The production steps are as follows: First, the hot-rolled steel coil with the above composition is subjected to slitting, edge milling, roll forming and high-frequency resistance welding to make a welded parent pipe with an outer diameter of Φ193.7mm and a wall thickness of 7.9mm; secondly , the HFW welded parent pipe is rapidly heated to 980°C by an intermediate frequency induction heating furnace, and then enters the multi-roller unit for thermal tension reduction of the entire pipe body, and a thermally reduced pipe with an outer diameter of Φ139.7mm and a wall thickness of 8.38mm is obtained. Billet; finally, the heat-stretched and reduced tube billet, which is still at a high temperature of about 795°C, is rotated through the online control cooling device to be rapidly cooled...

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Abstract

The invention discloses a J55-steel-grade SEW expandable casing tube and a manufacturing method thereof. The manufacturing method comprises following steps: (1) quickly heating a HFW welding tube blank through a middle-frequency induction furnace to 960-1020 DEG C; (2) performing multiple-pass full-tube thermal-stretch reducing to the HFW welding tube blank; and (3) rotationally passing the thermal-stretch reduced tube blank at 750-850 DEG C through an on-line-controlled cooling apparatus to quickly cool the tube blank to 250-450 DEG C and finally air-cooling the tube blank to room temperature. In the invention, by means of a one-step method, high-precision thermal moulding and target organism adjustment and control of the tube are achieved, thereby significantly reducing the production costs such as energy consumption. Through HFW welding, full-tube thermal-stretch reduction and on-line-controlled cooling, microstructure differences between welding seams and the base material can be eliminated, thereby achieving uniform organism performance of the full tube (including the base material and the welding seams) and further achieving excellent uniform deformation performance. Meanwhile, a banded structure is eliminated and a double-phase or multi-phase organism which is formed by reasonable combination of soft-phases and hard-phases with a large amount of ferrite and a less amount of bainite or martensite as the main composition, so that the J55-steel-grade SEW expandable casing tube has a high inner diameter expansion rate.

Description

technical field [0001] The invention belongs to the field of metal materials, and relates to non-API petroleum casing for special purposes, in particular to an alloy design used in a new type of J55 steel grade SEW (Hot Stretch-reducing Electric Welding, hot tension reducing electric resistance welding) expansion casing and manufacturing method Background technique [0002] Expandable tube technology is favored by oilfield users because of its advantages of optimizing wellbore structure, reducing drilling costs, saving operating time, quickly restoring production, and increasing single well production, and is playing an increasingly important role in oil and gas exploration and development. This technology has been successfully applied to workover, well completion, and even drilling operations abroad, and has achieved good benefits; in China, the expansion tube technology has also become an important means of workover and special formation treatment, and gradually Develop i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/32B21C37/06
Inventor 毕宗岳韦奉李远征张峰何石磊王涛唐俊李周波王军白鹤王亮周新义鲁碧为杨晓龙
Owner BC P INC CHINA NAT PETROLEUM CORP
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