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High-strength expansion casing pipe and making method thereof

A technology of expansion casing and manufacturing method, which is applied in the direction of casing, manufacturing tools, drill pipe, etc., can solve the problems of low strength and poor plasticity, and achieve the effect of improving pressure resistance, high strength and elongation, and low cost

Active Publication Date: 2019-12-27
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] One of the objectives of the present invention is to provide a high-strength expansion sleeve, which has high strength and elongation, so as to solve the problems of low strength and poor plasticity of the expansion sleeve in the prior art, and improve The pressure resistance of the expansion casing used in the downhole meets the demand for high-strength expansion casing in the field of oilfield production

Method used

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  • High-strength expansion casing pipe and making method thereof
  • High-strength expansion casing pipe and making method thereof
  • High-strength expansion casing pipe and making method thereof

Examples

Experimental program
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Effect test

Embodiment 1-5 and comparative example 1-4

[0042] Table 1-1 and Table 1-2 list the mass percent of each chemical element in the high-strength expansion sleeves of Examples 1-5 and Comparative Examples 1-4.

[0043] Table 1-1. (wt%, the balance is Fe and unavoidable impurities other than P, S, N)

[0044] serial number C mn Si P S Cr Mo V Ac1 Ac1+30 Ac3 Ac3-30 Example 1 0.1 3 0.2 0.009 0.002 / / 0.05 697 727 860 830 Example 2 0.12 4 0.1 0.010 0.001 0.2 0.2 0.07 686 716 858 828 Example 3 0.14 5 0.3 0.010 0.003 0.5 0.5 0.1 687 717 874 844 Example 4 0.18 6 0.4 0.012 0.005 / / 0.15 670 700 857 827 Example 5 0.20 4 0.25 0.013 0.002 / / 0.2 687 717 851 821 Comparative example 1 0.1 1.5

0.2 0.009 0.002 / / 0.05 713 743 860 830 Comparative example 2 0.3

4 0.1 0.010 0.001 0.2 0.2 0.07 686 716 817 787 Comparative example 3 0.05

5 0.3 0.010 0.003 / 0.5 / 678 708...

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Abstract

The invention discloses a high-strength expansion casing pipe. The chemical elements of the high-strength expansion casing pipe comprise, by mass percentage, 0.1-0.2% of C, 0.1-0.4% of Si, 3-6% of Mn,0.05-0.2% of V, 0.0005-0.005% of Ca, 0.01-0.04% of Ti, 0.01-0.05% of Al, at least one of 0-0.5% of Cr, 0-0.5% of Mo and 0-0.04% of Nb, and the balance Fe and other inevitable impurities. The invention further discloses a making method of the high-strength expansion casing pipe. The method comprises the steps of (1) conducting smelting and continuous casting to make a pipe blank; (2) conducting punching and continuous rolling on the pipe blank; and (3) conducting heat treatment, wherein the steel pipe is heated to the austenitizing temperature within the range of Ac1+30 DEG C to Ac3-30 DEG C,then heat preservation is conducted for 30-60 minutes, afterwards, water quenching is conducted, then tempering is conducted within the temperature range of 650-720 DEG C, heat preservation is conducted for 50-80 minutes, and then hot sizing is conducted.

Description

technical field [0001] The invention relates to a casing and a manufacturing method thereof, in particular to an expansion casing and a manufacturing method thereof. Background technique [0002] The expansion casing is a special kind of petroleum-specific pipe. In addition to having good expansion performance, it must also ensure that the mechanical properties of the corresponding steel grade casing in the American Petroleum Institute (API) standard are met after expansion, so as to meet the engineering application requirements. However, the mechanical properties of the expansion sleeve in the current prior art limit its expansion rate. When the expansion rate exceeds 20%, the expansion sleeve is prone to the problem of uneven wall thickness, resulting in local wall thickness reduction of the expansion sleeve. , thereby reducing the mechanical properties of the entire tube of the expansion sleeve, so obtaining an expansion sleeve with a high elongation rate is the main tech...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/12C22C38/14C22C38/06C22C38/38C22C38/24C22C38/22C22C38/26C22C38/28C21D9/08C21D1/18E21B17/00
CPCC21D1/18C21D9/08C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C22C38/22C22C38/24C22C38/26C22C38/28C22C38/38E21B17/00
Inventor 董晓明张忠铧高展
Owner BAOSHAN IRON & STEEL CO LTD