A two-step induction heating device and method for producing bent pipes for oil and gas pipelines

An induction heating device, oil and gas pipeline technology, applied in heat treatment furnaces, heat treatment equipment, process efficiency improvement, etc., can solve the problems of difficult to guarantee the performance of bending pipes, low production efficiency, large ellipticity, etc., and achieve small deformation and high production efficiency High, small ovality effect

Active Publication Date: 2016-08-31
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

However, since this local heating process only heats the bending part, and it is induction heated to a high temperature of 800 ° C ~ 990 ° C at one time during heating, and then sprayed with water to cool, "high temperature + rapid cooling" may cause the transition zone and the bending part Necking phenomenon, the higher the heating temperature, the faster the cooling rate, and the larger the D / t value, the more serious this phenomenon is; in addition, due to the one-time heating to a high temperature of 800 ° C to 990 ° C by using an induction coil, the performance of the bending pipe is not easy to guarantee ( Especially impact toughness), and easy to deform, large ovality, low production efficiency

Method used

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  • A two-step induction heating device and method for producing bent pipes for oil and gas pipelines
  • A two-step induction heating device and method for producing bent pipes for oil and gas pipelines

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Pipe specification: LSAW pipe, steel grade X70. Its bending steps are:

[0034] 1) Place the pipe on the fuselage 3 and set it in the first and second induction coils. The distance between the first and second induction coils is 100mm, and fix the tail of the pipe on the tailstock 4. Through the main drive device 5 Push the pipe 6;

[0035] 2) During the pipe pushing process, when the part of the pipe to be bent moves to the first induction coil 9, the pipe is heated to 650°C through the first induction coil, wherein the frequency of the first induction coil is 800Hz and the power is 1200kw , the voltage is 650V, and the width of the heating belt is 35mm. Then when the preheated part to be bent moves to the second induction coil 10, the pipe is heated to 980°C through the second induction coil, wherein the frequency of the second induction coil is 1000Hz, the power is 1200kw, and the voltage is 650V. The width of the heating belt is 30 mm. While the second inducti...

Embodiment 2

[0041] Pipe specification: LSAW pipe, steel grade X80. Its bending steps are:

[0042] 1) Place the pipe on the fuselage 3 and put it in the first and second induction coils. The distance between the first and second induction coils is 60mm, and fix the tail of the pipe on the tailstock 4, and pass through the main drive device 5 Push the pipe 6;

[0043] 2) During the pipe pushing process, when the part of the pipe to be bent moves to the first induction coil 9, the pipe is heated to 700°C through the first induction coil, wherein the frequency of the first induction coil is 850Hz and the power is 1300kw , the voltage is 700V, and the width of the heating belt is 35mm. Then when the preheated part to be bent moves to the second induction coil 10, the pipe is heated to 950°C through the second induction coil, wherein the frequency of the second induction coil is 1000Hz, the power is 1300kw, and the voltage is 650V. The width of the heating belt is 30mm. While the second ...

Embodiment 3

[0049] Pipe specification: LSAW pipe, steel grade X60. Its bending steps are:

[0050] 1) Place the pipe on the fuselage 3 and put it in the first and second induction coils. The distance between the first and second induction coils is 30mm, and fix the tail of the pipe on the tailstock 4, and pass through the main drive device 5 Push the pipe 6;

[0051] 2) During the pipe pushing process, when the part of the pipe to be bent moves to the first induction coil 9, the pipe is heated to 550°C through the first induction coil, wherein the frequency of the first induction coil is 500Hz and the power is 600kw , the voltage is 400V, and the width of the heating belt is 38mm. Then when the preheated part to be bent moves to the second induction coil 10, the pipe is heated to 930°C through the second induction coil, wherein the frequency of the second induction coil is 800Hz, the power is 600kw, and the voltage is 400V. The width of the heating belt is 25 mm. While the second in...

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Abstract

The invention provides a two-step induction heater of a bent tube for oil gas pipeline production, and a method thereof. The apparatus comprises a tube pushing mechanism, a bending mechanism, an electromagnetic induction heating mechanism and a cooling system, wherein double induction coils are arranged in the electromagnetic induction heating mechanism, a first induction coil is used to preheat a tube, a second induction coil is used to further heat the tube on the basis of preheating, and the bending system is used to bend the tube, so the mechanical properties of the bent tube obtained after bending are effectively improved, and many problems frequently appearing in present induction heated bent tube production are solved. The apparatus and the method can be used to produce induction heated bent tubes for high-performance oil gas pipeline production, can improve the tube heating uniformity in the bending process and the production efficiency of the bent tube, improve the dimension precision of the induction heated bent tube, and have the advantages of uniform heating and high production efficiency, and the bent tube produced in the invention has the advantages of excellent performances, small deformation, small ovality and low residual stress.

Description

technical field [0001] The invention belongs to the technical field of oil and natural gas pipelines, and relates to a two-step induction heating device and method for producing elbows for oil and gas pipelines. Background technique [0002] Elbow is an important component of oil and gas pipelines, and one of the most demanding structural parts in pipelines. The comprehensive quality of elbows is the key to restricting the safe and smooth operation of pipelines. [0003] The existing production process of pipe bends for oil and gas pipelines is as follows: after the straight pipe is cut, an induction coil is placed on the part to be bent of the steel pipe through a pipe bending machine, the pipe head is clamped with a mechanical rotating arm, and a current is passed into the induction coil. , heat the steel pipe to a plastic state, push it with mechanical thrust at the back end of the steel pipe, and bend it. The tube is bent out. The induction heating elbow is composed of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D9/14C21D1/42
CPCC21D1/42C21D9/08Y02P10/25
Inventor 熊庆人张冠军李为卫张伟卫罗金恒许晓锋
Owner BC P INC CHINA NAT PETROLEUM CORP
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