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Soluble magnesium alloy material for oil and gas extraction tools and preparation method thereof

A technology for oil and gas mining and magnesium alloys, which is applied in the field of soluble magnesium alloy materials for oil and gas mining tools and its preparation, can solve the problems of incomparability and inability to know the tensile strength, yield strength and elongation of alloys, etc., so as to improve the mechanical properties , Improve the effect of mechanical strength

Active Publication Date: 2021-12-10
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In one embodiment, an aluminum alloy is formed from Al and Mg, Si, Cu, Li or Mn, Zn, In metal elements, such elements can increase the strength of the alloy, or increase the downhole dissolution rate, but not involving elements in the alloy The content and specific alloy composition, and the tensile strength, yield strength and elongation of the alloy cannot be known, and it cannot be compared with the requirements of actual working conditions.

Method used

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  • Soluble magnesium alloy material for oil and gas extraction tools and preparation method thereof
  • Soluble magnesium alloy material for oil and gas extraction tools and preparation method thereof
  • Soluble magnesium alloy material for oil and gas extraction tools and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] in SF 6 and CO 2 Under the protection of gas, melt at 710-720°C and carry out slag stirring on the melt, raise the temperature to 755-760°C and keep it for 15 minutes, and then pour it into the mold to obtain a soluble magnesium alloy with the composition of Mg-6Ni-5Cu - Ingot of 2Ca (wt.%). The ingot is subjected to solution treatment at 450°C×12h, and the solid solution alloy is extruded at 420°C with an extrusion ratio of 22.5 to obtain extruded rods.

[0076] In order to simulate different environments of oil exploitation, the corrosion rate of the alloy is studied at room temperature (25°C) and 93°C, 3% KCl and 0.05% KCl, 50°C, and the method of testing the corrosion rate is the weight loss method. The mechanical performance test is carried out according to the national standard, and the strain rate is 10 -3 / s.

[0077] The mechanical properties and corrosion properties of the alloy Mg-6Ni-5Cu-2Ca are shown in Table 1.

Embodiment 2

[0079] in SF 6 and CO 2Under the protection of gas, melt at 700-710°C and carry out slag stirring on the melt, raise the temperature to 750-755°C for 18 minutes, and then pour it into the mold, and finally obtain a soluble magnesium alloy with the composition of Mg-4Ni- Ingot of 5Cu-2Y-0.5Mn (wt.%). The cast ingot was heat treated at 520°C×12h, the solid solution alloy was hot-extruded at 480°C with an extrusion ratio of 7, and the extruded alloy was aged at 250°C×15h to obtain an aged bar.

[0080] Corrosion rate and mechanical property testing methods are the same as in Example 1.

[0081] The mechanical properties and corrosion properties of the alloy Mg-4Ni-5Cu-2Y-0.5Mn are shown in Table 1.

Embodiment 3

[0083] in SF 6 and CO 2 Under the protection of gas, smelt at 715-720 °C and carry out slag stirring on the melt, raise the temperature to 750-760 °C and keep it for 16 minutes, and then pour it into the mold to obtain a soluble magnesium alloy composition of Mg-1.5Ni- Ingot of 4Cu-1Sn (wt.%). The ingot was subjected to solution treatment at 480°C×24h, and the solid solution alloy was extruded at 430°C with an extrusion ratio of 15.6 to obtain extruded rods.

[0084] Corrosion rate and mechanical property testing methods are the same as in Example 1.

[0085] The mechanical properties and corrosion properties of the alloy Mg-1.5Ni-4Cu-1Sn are shown in Table 1.

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Abstract

The invention discloses a soluble magnesium alloy material for oil and gas exploitation tools and a preparation method thereof. With Ni and Cu as the main elements, Mg‑Ni‑Cu alloys are formed, and soluble magnesium alloys containing different second phases are formed by adjusting the type and content of Mg‑Ni‑Cu alloy elements, so that the potential of the matrix and the second phase The difference changes, thereby accelerating the alloy dissolution. The corrosion rate of Mg‑Ni‑Cu alloys in 0.05% KCl solution at 50 °C is 3-35 mg cm ‑2 h ‑1 , the corrosion rates in 3% KCl solution at 25°C and 93°C are 8-30 mg·cm ‑2 h ‑1 and 130~285mg·cm ‑2 h ‑1 . The soluble Mg-Ni-Cu alloy prepared by the invention has the advantages of simple process, low cost, fast dissolution rate and the like, and can meet the dissolution requirements of different oil and gas exploitation tools. In addition, by adjusting the heat treatment system and deformation process, the mechanical properties can be further improved, so as to obtain excellent comprehensive properties. The Mg-Ni-Cu system soluble magnesium alloy of the present invention has broad application prospects in the field of oil and gas exploitation.

Description

[0001] field of invention [0002] The invention relates to a soluble magnesium alloy material for oil and gas mining tools and a preparation method thereof. The soluble magnesium alloy has the advantages of simple process, low cost, excellent mechanical and corrosion comprehensive properties, and the like. Background technique [0003] In recent years, as important discoveries have been made in the exploration of unconventional oil and gas fields, the exploitation of low-permeability oil and gas fields has gradually attracted attention. Most of these oil fields are distributed in formations of different depths. At present, the commonly used technologies for the exploitation of low permeability oil and gas fields include water injection and fracturing. Horizontal well staged fracturing technology is an important means to improve low-permeability oil and gas and increase oil and gas well production. [0004] Downhole tools (such as frac balls, bridge plugs, etc.) are an import...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/00C22C23/06C22C1/02C22F1/06
CPCC22C23/00C22C23/06C22C1/02C22F1/06
Inventor 李宏祥刘耀鸿王健张济山
Owner UNIV OF SCI & TECH BEIJING