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High-steel-grade oil well pipe and preparation method thereof

An oil well pipe and steel grade technology, which is applied in the field of high steel grade oil well pipe and its preparation, can solve the problems of long heat treatment process time, high manufacturing cost of oil well pipe, complicated process and the like

Active Publication Date: 2021-03-19
CENT IRON & STEEL RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above analysis, the present invention aims to provide a high-grade oil well pipe and its preparation method to solve the problems of high manufacturing cost, long heat treatment process time and complicated process in the prior art. Reduce the cost of oil well pipe

Method used

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  • High-steel-grade oil well pipe and preparation method thereof
  • High-steel-grade oil well pipe and preparation method thereof
  • High-steel-grade oil well pipe and preparation method thereof

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preparation example Construction

[0039] A method for preparing a high-grade steel oil well pipe, comprising the following steps:

[0040] Step 1. Smelting, refining and continuous casting are carried out according to the composition of the oil well pipe to form a slab; the slab is heated at a heating temperature of 1180-1220° C.; heat preservation is carried out for 1-1.5 hours.

[0041] Step 2. The cast slab after heat preservation is directly pierced, descaled, continuously rolled, sized, and air-cooled to room temperature to obtain a hot-rolled steel pipe; wherein, the final rolling temperature of the continuous rolling process is controlled at 820-860°C to ensure that the hot-rolled steel pipe The microstructure is granular bainite.

[0042] Step 3. Inductively heat the hot-rolled steel pipe to the temperature T1 (for example, 780-820°C) between the two-phase regions, keep it warm for 10-30s, cool it to T2 (400-450°C) in air, then quench it in a salt bath to room temperature, and then return to Fire gets...

Embodiment 1

[0055] This embodiment provides a high-grade oil well pipe, which is prepared by the following method:

[0056] Step 1. Smelting, refining and continuous casting are carried out according to the composition of the oil well pipe to form a slab; the slab is heated at a temperature of 1180° C. and kept for 1 hour.

[0057] Step 2. The cast slab after heat preservation is directly pierced, descaled, continuously rolled, sized, and air-cooled to room temperature to obtain a hot-rolled steel pipe; wherein, the final rolling temperature of the continuous rolling process is controlled at 820°C to ensure the microscopic quality of the hot-rolled steel pipe. The organization is granular bainite.

[0058] Step 3. Inductively heat the hot-rolled steel pipe to 780°C, keep it warm for 30s, air cool it to 400°C, then quench it in a salt bath to room temperature, then keep it at 500°C for 1 hour, then air cool it to room temperature to obtain a high-strength steel grade oil well pipe.

Embodiment 2

[0060] This embodiment provides a high-grade oil well pipe, which is prepared by the following method:

[0061] Step 1. Smelting, refining and continuous casting are carried out according to the composition of the oil well pipe to form a slab; the slab is heated at 1200° C.; and kept for 1.5 hours.

[0062] Step 2. The cast slab after heat preservation is directly pierced, descaled, continuously rolled, sized, and air-cooled to room temperature to obtain a hot-rolled steel pipe; wherein, the final rolling temperature of the continuous rolling process is controlled at 840°C to ensure the microscopic quality of the hot-rolled steel pipe. The organization is granular bainite.

[0063] Step 3. Inductively heat the hot-rolled steel pipe to 780°C, keep it warm for 20s, air cool it to 450°C, then quench it in a salt bath to room temperature, then keep it at 500°C for 1 hour, then air cool it to room temperature to obtain a high-strength steel grade oil well pipe.

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Abstract

The invention discloses a high-steel-grade oil well pipe and a preparation method thereof, belongs to the technical field of oil well pipes, and solves the problems of high manufacturing cost and complex process of an oil well pipe in the prior art. The high-steel-grade oil well pipe comprises the following chemical components in percentage by mass: 0.03%-0.08% of C, 0.3%-0.5% of Si, 0.5%-1.5% ofMn, less than or equal to 0.025% of P, less than or equal to 0.005% of S, 0.01%-0.07% of Nb, less than or equal to 0.06% of Al and the balance of Fe and inevitable impurities. The metallographic structure of the high-steel-grade oil well pipe is granular bainite and retained austenite, and the high-steel-grade oil well pipe possesses good comprehensive mechanical properties.

Description

technical field [0001] The invention belongs to the technical field of oil well pipes, in particular to a high-grade oil well pipe and a preparation method thereof. Background technique [0002] Oil well pipe is a pipe string steel pipe that is lowered into the oil well casing during oil and gas field development. It is a pipeline that transports crude oil and natural gas from the oil and gas layer to the surface after drilling. It must withstand hundreds or even thousands of atmospheric pressure and thousands of newtons. Tensile load , Once there are problems with service performance and quality, the entire oil well will be scrapped. In addition, with the successive development of geologically harsh oil fields, the service conditions of oil casings have become more complex and harsh. In the future, a number of deep wells and ultra-deep wells will be drilled in my country. As the well depth continues to increase, the temperature and pressure in the well will also increase ac...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/12C21D8/10C21D1/18C21D1/10E21B17/00
CPCC22C38/02C22C38/04C22C38/06C22C38/12C21D8/105C21D1/18C21D1/10E21B17/00C21D2211/002C21D2211/001Y02P10/25
Inventor 童帅李拔黄涛
Owner CENT IRON & STEEL RES INST
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