A kind of j55 steel grade sew expansion sleeve and its manufacturing method

An expansion sleeve and manufacturing method technology, applied in the field of new J55 steel grade SEW expansion sleeve, alloy design and manufacture, and non-API oil casing, 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: 2017-09-29
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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  • A kind of j55 steel grade sew expansion sleeve and its manufacturing method
  • A kind of j55 steel grade sew expansion sleeve and its manufacturing method
  • A kind of j55 steel grade sew expansion sleeve and its manufacturing method

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Experimental program
Comparison scheme
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 coils with the above composition are slit, milled, cold-formed by roll forming and high-frequency resistance welding to make a welded mother pipe with an outer diameter of Φ193.7mm and a wall thickness of 7.8mm; , The HFW welded mother tube is quickly heated to 1010℃ by the intermediate frequency induction heating furnace, and then enters the multi-roller unit for thermal tension reduction of the whole tube body to obtain a thermal tension reduction tube with an outer diameter of Φ139.7mm and a wall thickness of 8.15mm The billet; finally, the heat-stretched tube billet whose temperature is still high at around 825°C is rapidly cooled to 360°C by rotating it through the online control cooling device, and then air-cooled ...

Embodiment 2

[0020] The chemical composition of the hot-rolled steel coil of this embodiment is (mass percentage, %): C 0.11, Si 0.17, Mn 1.12, Cr0.52, 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 coils with the above composition are slit, milled, cold-formed by roll forming, and high-frequency resistance welding to make a welded mother pipe with an outer diameter of Φ193.7mm and a wall thickness of 7.34mm; , The HFW welded mother tube is quickly heated to 995℃ by the intermediate frequency induction heating furnace, and then enters the multi-roller unit to perform the thermal tension reduction of the whole tube body to obtain a thermal tension reduction tube with an outer diameter of Φ139.7mm and a wall thickness of 7.72mm The billet; finally, the heat-stretched tube billet whose temperature is still high at around 810°C is quickly cooled to 390°C by rotating it through the on-line cooling device, and then air-coo...

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 coils with the above composition are slit, milled, cold-formed by roll roll forming and high-frequency resistance welding to make a welded mother pipe with an outer diameter of Φ193.7mm and a wall thickness of 7.9mm; , The HFW welded mother pipe is quickly heated to 980℃ by the intermediate frequency induction heating furnace, and then enters the multi-roller unit to perform the thermal tension reduction of the whole tube body, and obtains the thermal tension reduction tube with an outer diameter of Φ139.7mm and a wall thickness of 8.38mm The billet; finally, the heat-stretched tube billet whose temperature is still high at around 795°C is quickly cooled to 405°C by rotating it through the online control cooling device, ...

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Abstract

The invention discloses a J55 steel grade SEW expansion sleeve and a manufacturing method thereof. The HFW welded tube billet is rapidly heated to 960-1020°C through an intermediate frequency induction furnace, and then enters a roll unit for multi-pass thermal tension reduction of the whole tube body. , and then the heat-stretched and reduced tube billet, which is still at a high temperature of 750-850 ° C, is rotated through an online control cooling device, rapidly cooled to 250-450 ° C, and then air-cooled to room temperature. The invention adopts a one-step method to realize high-precision thermoforming and target structure regulation of pipes, which significantly reduces production costs such as energy consumption; after HFW welding, thermal tension reduction of the whole pipe body and online controlled cooling, the weld seam and base metal are eliminated. The difference in microstructure achieves uniform structure and properties of the whole pipe body (base metal and weld), obtains excellent uniform deformation performance, eliminates banded structure, and obtains "a large amount of ferrite + a small amount of bainite / martensite" The dual-phase or multi-phase structure with reasonable matching of the main soft and hard phases makes the J55 steel grade SEW expansion sleeve have a higher inner diameter expansion rate.

Description

Technical field [0001] The invention belongs to the field of metal materials, and relates to special-purpose non-API petroleum casing pipes, in particular to a new type of J55 steel grade SEW (Hot Stretch-reducing Electric Welding) expansion casing alloy design And manufacturing method Background technique [0002] Expansion tube technology is favored by oilfield users because of its advantages such as optimizing well structure, reducing drilling and production costs, saving operation time, quick recovery of production, and increasing single well production, and it plays 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, expandable tube technology has also become an important means for workovers and treatment of special formations encountered in drilling. Development towards open hole subsidies and side...

Claims

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Application Information

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Patent Type & Authority Patents(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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