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Method for preparing N80 steel-grade expansion tubes for petroleum and natural gas exploitation

A technology for oil and gas and expansion pipes, applied in the field of metal materials, can solve the problems of increasing the production cost of expansion pipes, unfavorable promotion, unfavorable pipe welding, etc.

Inactive Publication Date: 2012-07-04
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] After a comprehensive analysis of the current domestic expansion tube technology, it is not difficult to find that the current expansion tube material research has the following technical problems: First, the alloy composition of the tube material is complex, and the amount of precious metals and rare metals is large, which directly leads to the use of tubes. The carbon equivalent of steel is high, which is not conducive to the welding of pipes
The use of precious metals and rare metals increases the production cost of expansion tubes from raw materials, which is not conducive to the promotion of this technology; in addition, due to the complex alloy composition and high alloy element content of the materials involved in the two patents, in The carbon equivalent of the material is virtually increased, which will also have adverse effects on the welding of the pipe

Method used

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  • Method for preparing N80 steel-grade expansion tubes for petroleum and natural gas exploitation
  • Method for preparing N80 steel-grade expansion tubes for petroleum and natural gas exploitation
  • Method for preparing N80 steel-grade expansion tubes for petroleum and natural gas exploitation

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Experimental program
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Effect test

Embodiment 1

[0068] The chemical composition weight percentage of selected raw material steel is as follows:

[0069] 0.15wt%~0.25wt% C; 1.5wt%~2.0% Mn; 1.0wt%~1.5wt% Si; 0.3wt%~0.8wt% Al; 0.05wt%~0.1wt% Nb; 0.01 wt%~0.02 wt% of Ti; 0 wt%~0.005wt% of S; 0wt%~0.01 wt% of P.

[0070] The preferred ingredients are: C: 0.15wt%~0.25wt%, Mn: 1.5wt%~2.0wt%, Si: 1.0wt%~1.5wt%, Al: 0.3wt%~0.8wt%, Nb: 0.1wt% , Ti: 0.02wt%, S: 0.005wt%, P: 0.01wt%, and the balance is Fe and unavoidable impurities.

[0071] The preferred production steps are as follows:

[0072] 1) Casting and rolling alloy plates according to the composition of the expansion tube described in the above technical solution;

[0073] 2) Coil the alloy plate, and then weld it to form an expansion tube;

[0074] 3) Put the expansion tube into a resistance heating furnace and heat it to the two-phase zone of 750-800°C at a heating rate of 5°C / s for 30 minutes to make it partially austenitized, and then use online spraying The method o...

Embodiment 2

[0079] Select the preferred composition of the chemical composition of raw material steel with embodiment 1:

[0080] The preferred production steps are as follows:

[0081] 1) Casting and rolling alloy plates according to the composition of the expansion tube described in the above technical solution;

[0082] 2) Coil the alloy plate, and then weld it to form an expansion tube;

[0083] 3) Put the expansion tube into a resistance heating furnace and heat it to the two-phase region of 750-800°C at a heating rate of 5°C / s for 60 minutes to make it partially austenitized, and then use online spraying The method of shower quenching makes it quenched to obtain martensite + ferrite structure (two-phase zone quenching process);

[0084] 4) Place the quenched expansion tube in the resistance heating furnace again, heat it to the two-phase region (sub-temperature region) of 740°C~780°C at a heating rate of 5°C / s, and keep it warm for 15 minutes to make the pipe structure Partial au...

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Abstract

The invention discloses a method for preparing N80 steel-grade expansion tubes for petroleum and natural gas exploitation, and belongs to the field of metal materials. An N80 steel-grade expansion tube comprises the following chemical compositions in percentage by mass: 0.1 to 0.3 percent of C, 1.0 to 2.5 percent of Mn, 0.3 to 1.5 percent of Si, 0 to 1.0 percent of Al, 0.02 to 0.1 percent of Nb, 0 to 0.02 percent of Ti and the balance of Fe and inevitable impurities. After related alloy plates are obtained through smelting and rolling, the alloy plates are bent and welded into expansion tubes, and through a heat treatment process consisting of two procedures, namely two-phase region quenching and sub-temperature tempering-quenching-partitioning treatment, the expansion tubes reach the expected strength standard and plastic deformation capacity, and the mechanical properties of the tubes before and after expansion can meet the requirements of American Petroleum Institute (API) and other related standards. Test results show that the N80 steel-grade multiphase high-uniformity extended expansion tubes have high strength, plasticity, toughness and elongation, and the comprehensive mechanical properties are superior to those of the conventional dual-phase steel and Trip steel.

Description

technical field [0001] The invention belongs to the field of metal materials, and in particular relates to a preparation method of an N80 steel-grade expansion pipe used in petroleum and natural gas development. Background technique [0002] In recent years, with the gradual growth of my country's oil and natural gas consumption, exploration and development have penetrated into the fields of marine operations, land ultra-deep wells, and secondary development of old wells, making oil exploration and development increasingly difficult. When the drilling operation needs to pass through deeper overpressure formations, depleted formations or formations that are prone to collapse and leakage, the existing technology is to use drill bits of different diameters to drill, and use casings of different diameters to seal layer by layer in the form of sleeves Finish. In this case, the deeper the well, the more casing layers, and the larger the borehole diameter; on the contrary, if the ...

Claims

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Application Information

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IPC IPC(8): C22C38/12C22C38/14C21D8/10C21D1/18
Inventor 尚成嘉任勇强谢振家贺飞汤忖江王学敏
Owner UNIV OF SCI & TECH BEIJING
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