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Preparation method of J55-grade steel ERW (electric resistance welding) expansion pipe with high diameter expansion performance

An expansion pipe, steel grade technology, applied in drilling pipe, casing, earthwork drilling and other directions, can solve the problems of coarse structure, high cost, microstructure difference between base metal and weld area, etc., and achieve wide application prospects, Simple preparation method and the effect of overcoming technical deficiencies

Inactive Publication Date: 2013-09-25
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The high-performance expansion tube material at home and abroad, it can significantly improve the elongation on the premise of ensuring the material strength, but more alloy elements are added to the composition, and the cost is high, which affects the expansion tube in oil drilling. long-distance applications in
So far, less than 10% of the application cases of expansion pipes with a length of more than 1000 meters or full wells in the world
However, ERW welded pipes have undergone thermal processes such as microstructure coarsening, extrusion of steel plate core structures in the direction of rheology, and rapid heating and cooling during welding, which will cause differences in the microstructure of the base metal and the weld zone, thus making the overall welded pipe uneven performance

Method used

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  • Preparation method of J55-grade steel ERW (electric resistance welding) expansion pipe with high diameter expansion performance
  • Preparation method of J55-grade steel ERW (electric resistance welding) expansion pipe with high diameter expansion performance
  • Preparation method of J55-grade steel ERW (electric resistance welding) expansion pipe with high diameter expansion performance

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Experimental program
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Effect test

Embodiment 1

[0015] Heat the J55 steel grade ERW expansion tube whose alloy composition is shown in Table 1 to 1150°C and keep it warm for 30 minutes, then air cool to room temperature; then reheat to J55 steel grade expansion tube A C3 Point above 50°C (890°C) and keep it warm for 60 minutes, then air cool to room temperature; finally, keep the steel plate in the two-phase zone of 700°C for 60 minutes. from figure 1 It can be seen that the obtained J55 steel grade ERW expansion tube has a large n value after heat treatment; the r value calculated by formula (1) is 1.4 ([8] Wu Shi. Stamping Technology [M]. Xi'an: Northwestern Polytechnical University Press, 1987 , 5-6); from Table 2, it can be seen that the uniform elongation of the base metal and the weld zone are both above 16%, and the mechanical properties are relatively close, meeting the performance requirements of API Spec 5CT for J55 steel grade; at 13% After pre-straining, the tensile strength of the base metal is 571 MPa, the yi...

Embodiment 2

[0026] Heat the J55 steel grade ERW expansion tube whose alloy composition is shown in Table 3 to 1000°C and keep it warm for 60 minutes, then air cool to room temperature; then reheat to J55 steel grade expansion tube A C3 Point above 100°C (930°C) and keep it warm for 30 minutes, then air cool to room temperature; finally keep the steel plate in the two-phase zone of 750°C for 30 minutes. from figure 1 It can be seen that the obtained J55 steel grade ERW expansion tube has a large n value after heat treatment; the r value calculated by the formula (1) is 1.2; it can be seen from Table 4 that the uniform elongation of the base metal and the weld zone both reach more than 13%, and The mechanical properties are relatively close and meet the performance requirements of the API Spec 5CT standard; after 13% pre-strain, the tensile strength of the base metal is 672MPa, the yield strength is 664MPa, the tensile strength of the weld zone is 679MPa, and the yield strength is 670 MPa;...

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Abstract

The invention relates to a preparation method of a J55-grade steel ERW (electric resistance welding) expansion pipe with high diameter expansion performance, belonging to the field of metal materials. The invention is characterized in that J55-grade steel expansion pipe steel is acquired at low production cost through reasonable alloy design, and is welded to make the pipe instead of the seamless steel pipe. The method comprises the following steps: heating a J55-grade steel expansion pipe to 1000-1150 DEG C, keeping the temperature for 30-60 minutes, and cooling in air to room temperature; heating the J55-grade steel expansion pipe to the temperature of 50-100 DEG C higher than the J55-grade steel expansion pipe steel AC3 point, keeping the temperature for 30-60 minutes, and cooling in air to room temperature; and finally keeping the steel plate at the two-phase region temperature of 700-750 DEG C for 30-60 minutes. The invention eliminates the microstructure difference between the base material and the weld zone, implements substantial conformity of properties at all parts of the pipe body, and acquires a uniform distribution ferrite. The content of the ferrite is high, and is approximate to the critical value under such conditions. The method is beneficial to eliminating the zonal structure of the material so as to refine the structure, eliminate some defects (such as voids and the like) and enhance the uniform elongation rate, so that the J55-grade steel ERW expansion pipe has higher overall diameter expansion performance. The preparation method provided by the invention is simple; and the ERW expansion pipe is practical and economical.

Description

technical field [0001] The invention belongs to the field of metal materials and relates to oil casing pipes, in particular to an alloy design and a heat treatment process for J55 steel grade ERW expansion pipes used in oil field development. Background technique [0002] Expandable pipe technology is a very promising oil drilling technology developed in recent years. It provides a new and effective way to solve problems such as drilling, cementing and repairing wells. The expansion principle of the so-called expansion tube, from a technical point of view, is to use the elastic-plastic characteristics of the metal to move the expansion mandrel axially from top to bottom or from bottom to top in the expansion tube, and make it The casing undergoes permanent plastic deformation in the plastic zone, which expands the diameter of the expansion tube by 7-30%. The expansion tube technology can reduce the drilling size and optimize the wellbore structure; at the same time, the exp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D9/08E21B17/01C22C38/04
Inventor 尚成嘉贺飞汤忖江任勇强谢振家
Owner UNIV OF SCI & TECH BEIJING
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