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125ksi Hydrogen Sulfide Stress Corrosion Resistant High Strength Oil Casing Steel and Its Preparation Process

A stress corrosion and hydrogen sulfide resistance technology is applied in the field of 125ksi hydrogen sulfide stress corrosion resistant high-strength oil casing steel and its preparation technology, which can solve the problems of casing string scrap, blowout, ecological damage of drilling rigs, etc.

Active Publication Date: 2020-12-25
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ordinary casing used in sulfur-containing oil and gas fields will suddenly break when the stress is far less than its yield strength. In the lightest case, the casing string or the entire well will be scrapped. Spilled together, causing huge damage to the entire drilling rig and the surrounding ecology

Method used

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  • 125ksi Hydrogen Sulfide Stress Corrosion Resistant High Strength Oil Casing Steel and Its Preparation Process
  • 125ksi Hydrogen Sulfide Stress Corrosion Resistant High Strength Oil Casing Steel and Its Preparation Process
  • 125ksi Hydrogen Sulfide Stress Corrosion Resistant High Strength Oil Casing Steel and Its Preparation Process

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Experimental program
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Effect test

Embodiment 1

[0087] Table 1 is the chemical composition of the hydrogen sulfide stress corrosion resistant oil casing steel of the present invention, and Table 2 is the heat treatment method of the hydrogen sulfide stress corrosion resistant oil casing steel of the present invention (heat-treat the steel plate after hot rolling, see Table 2). According to the chemical composition set in Table 1, the oxide metallurgy process was used to smelt in a vacuum induction furnace, and then cast to form a steel ingot, and cooled to room temperature. Then the steel ingot is heated to 1050°C for forging, and cooled to room temperature to form a billet of 80×80mm. Then the billet is kept in the furnace at a heating temperature of 1150° C. for 2 hours, then hot rolled, and finally rolled into a steel plate with a thickness of 13 mm, and then air-cooled to room temperature. Normalize the hot-rolled and cooled steel plate at 900°C, keep it warm for 10 minutes, air cool to room temperature, then quench it...

Embodiment 2

[0089] Table 1 is the chemical composition of the hydrogen sulfide stress corrosion resistant oil casing steel of the present invention, and Table 2 is the heat treatment method of the hydrogen sulfide stress corrosion resistant oil casing steel of the present invention (heat-treat the steel plate after hot rolling, see Table 2). According to the chemical composition set in Table 1, the oxide metallurgy process was used to smelt in a vacuum induction furnace, and then cast to form a steel ingot, and cooled to room temperature. Then the steel ingot is heated to 1100°C for forging, and cooled to room temperature to form a billet of 80×80mm. Then hot rolling is carried out in a furnace at a heating temperature of 1200° C. for 2 hours, and finally rolled into a steel plate with a thickness of 15 mm, which is air-cooled to room temperature. Normalize the hot-rolled and cooled steel plate at 910°C, keep it warm for 15 minutes, air cool to room temperature, then quench it at 830°C, ...

Embodiment 3

[0091] Table 1 is the chemical composition of the hydrogen sulfide stress corrosion resistant oil casing steel of the present invention, and Table 2 is the heat treatment method of the hydrogen sulfide stress corrosion resistant oil casing steel of the present invention (heat-treat the steel plate after hot rolling, see Table 2). According to the chemical composition set in Table 1, the oxide metallurgy process was used to smelt in a vacuum induction furnace, and then cast to form a steel ingot, and cooled to room temperature. Then the steel ingot is heated to 1100°C for forging, and cooled to room temperature to form a 100×100 square billet. Then hot rolling is carried out in a furnace at a heating temperature of 1200° C. for 2 hours, and finally rolled into a steel plate with a thickness of 15 mm, which is air-cooled to room temperature. Normalize the hot-rolled and cooled steel plate at 920°C, keep it warm for 20 minutes, air-cool it to room temperature, then quench it at ...

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Abstract

The invention provides 125ksi anti-hydrogen sulfide stress corrosion high-strength oil casing steel and a preparation process thereof. The chemical components (% by mass) of the steel used in the present invention are as follows: 0.08-0.27% of C, 0.1-0.5% of Si, 0.15-1.8% of Mn, 0.3-1.0% of Cr, 0.4-1.0% of Mo, 0.05-0.4% of V, 0.01-0.1% of Ti, 0.1-0.7% of Cu, 0.2-3.0% of Ni, 0.0001-0.002% of B, 0-0.015% of P, 0-0.010% of S, 0-0.06% of O, 0-0.05% of N, 0-0.05% of H and the balance comprising Fe and unavoidable impurities. The yield strength of the steel grade is 862-1034 MPa, thereby meeting theinternational standard for anti-hydrogen sulfide stress corrosion NACE-A test requirements.

Description

technical field [0001] The invention relates to a 125ksi grade seamless oil casing steel resistant to hydrogen sulfide stress corrosion and a preparation process thereof. Background technique [0002] Since the early 1950s, hydrogen sulfide stress corrosion cracking accidents of oil well pipes occurred in the Pincher Bay oilfield in Alberta, Canada, and hydrogen sulfide stress corrosion cracking accidents have occurred in oil and gas fields around the world, causing oil industry all over the world. , The attention of the steel industry. Studies have found that about 1 / 3 of the world's oil and gas fields contain hydrogen sulfide gas. Ordinary casing used in sulfur-containing oil and gas fields will suddenly break when the stress is far less than its yield strength. In the lightest case, the casing string or the entire well will be scrapped. Spilled together, resulting in huge damage to the entire drilling rig and the surrounding ecology. With the increasing demand for ener...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/44C22C38/46C22C38/50C22C38/42C22C38/54C22C38/48C22C33/04C21D8/02
CPCC21D8/0205C21D8/0226C21D8/0263C22C33/04C22C38/002C22C38/005C22C38/02C22C38/04C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/54
Inventor 张思王丙兴朱伏先王平肖邦
Owner NORTHEASTERN UNIV LIAONING
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