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High-ductility low-temperature quick-degraded magnesium alloy and preparation method thereof

A rapid degradation and high elongation technology, applied in the field of magnesium alloy materials, can solve problems such as the inability to meet the requirements of the production area, and achieve the effects of refining alloy grains, increasing degradation speed, and improving plasticity

Active Publication Date: 2019-07-09
CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Taking an oil and gas production area in my country as an example, due to the shallow drilling depth and the influence of natural factors, the downhole temperature is less than 40°C. However, the working temperature of magnesium alloy fracturing ball products on the market is mostly above 90°C, and the higher the working temperature , the degradation rate of magnesium alloy fracturing balls is correspondingly faster, so the current commercial magnesium alloy fracturing ball materials cannot meet the requirements of this production area

Method used

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  • High-ductility low-temperature quick-degraded magnesium alloy and preparation method thereof
  • High-ductility low-temperature quick-degraded magnesium alloy and preparation method thereof
  • High-ductility low-temperature quick-degraded magnesium alloy and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0026] A magnesium alloy with high elongation and rapid degradation at low temperature, the magnesium alloy contains the following components in terms of mass percentage: Gd6.0%, Ni0.18%, Zr0.5%, unavoidable impurities≤0.3%, and the balance is Mg. The magnesium alloy is prepared as follows:

[0027] (1) Melt the magnesium ingot at 710°C, add Mg-Zr master alloy, Mg-Gd master alloy, and Mg-Ni master alloy after melting, then keep it at 700°C for 30 minutes, and then pass it into argon for 15 minutes of refining , and then remove the slag from the alloy melt and let it stand at 700°C until the impurities settle, and finally make a semi-continuous ingot after semi-continuous casting at 680°C;

[0028] (2) Homogenization treatment: heat the semi-continuous ingot prepared in step (1) to 350° C. for 8 hours, then keep it warm for 24 hours, then air-cool it to room temperature, heat it up to 480° C. for 12 hours again, and keep it warm for 12 hours;

[0029] (3) Quenching treatment: ...

Embodiment 2

[0032] A magnesium alloy with high elongation and rapid degradation at low temperature. The magnesium alloy contains the following components in terms of mass percentage: Gd6.5%, Ni0.1%, Mn0.8%, unavoidable impurities≤0.3%, and the balance is Mg. The magnesium alloy is prepared as follows:

[0033] (1) Melt the magnesium ingot and the Mg-Mn master alloy together at 690°C, and then add the Mg-Gd master alloy and Mg-Ni master alloy after melting, then keep it at 680°C for 25 minutes, and then pass it into argon for refining After 5 minutes, the alloy melt was deslagged and left to stand at 690°C until the impurities settled, and finally semi-continuously cast at 675°C to obtain a semi-continuous ingot;

[0034](2) Homogenization treatment: heat the semi-continuous ingot prepared in step (1) to 330° C. for 6 hours, then keep it warm for 28 hours, then air-cool it to room temperature, heat it up to 460° C. for 8 hours again, and keep it warm for 18 hours;

[0035] (3) Quenching t...

Embodiment 3

[0038] A high-elongation low-temperature rapid degradation magnesium alloy, the magnesium alloy contains the following components by mass percentage: Gd5.0%, Ni 0.25%, Zr 0.25%, Mn 0.6%, unavoidable impurities ≤ 0.3%, the balance is Mg. The magnesium alloy is prepared as follows:

[0039] (1) Melt the magnesium ingot and the Mg-Mn master alloy together at 710°C, then add the Mg-Zr master alloy, Mg-Gd master alloy, and Mg-Ni master alloy after melting, and then keep the temperature at 720°C for 20 minutes. Then pass through the argon gas for refining for 10 minutes, then remove the slag from the alloy melt and let it stand at 710°C until the impurities settle, and finally make semi-continuous ingots after semi-continuous casting at 685°C;

[0040] (2) Homogenization treatment: heat the semi-continuous ingot prepared in step (1) to 380° C. for 12 hours, then keep it warm for 16 hours, then air-cool it to room temperature, heat it up to 470° C. for 10 hours again, and keep it wa...

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Abstract

The invention relates to a high-ductility low-temperature quick-degraded magnesium alloy and a preparation method thereof, and belongs to the technical field of magnesium alloy materials. The alloy comprises the following components in percentage by mass: 5.0-6.5% of Gd, 0.1-0.25% of Ni, 0.05-0.5% of Zr and / or 0.4-1.0% of Mn, inevitable impurity not more than 0.3%, and the balance of Mg. The effects of various alloy elements are considered; the synergistic effect of the alloy elements is used for obtaining the magnesium alloy with high plasticity and higher low-temperature degrading speed; thealloy is few in element type, low in element adding quantity and low in cost, so that the alloy preparation cost is not obviously increased; and compared with a commercial magnesium alloy, the magnesium alloy is small in change of the preparation process and suitable for mass production.

Description

technical field [0001] The invention belongs to the technical field of magnesium alloy materials, and in particular relates to a high-elongation low-temperature rapid-degradation magnesium alloy and a preparation method thereof. Background technique [0002] In oil and gas drilling technology, fracturing technology is the core technology, which directly determines the success of staged fracturing. The multi-stage sliding sleeve staged fracturing technology is a new type of oil and natural gas stimulation technology newly developed in the field of oil and gas well engineering technology in recent years. In the multi-stage sliding sleeve segmental fracturing technology, the fracturing ball plays a very important role. The fracturing ball mainly plays the following two roles in this technology: 1. 2. Cut off the fracturing fluid and pressure. After the fracturing of the rock production layer is completed, it is necessary to release the pressure of the tubing in the well to fa...

Claims

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Application Information

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IPC IPC(8): C22C23/06C22C1/03C22F1/06
CPCC22C1/03C22C23/06C22F1/002C22F1/06
Inventor 余大亮黄家俊张丁非兰伟戴庆伟杨青山柴森森曹鹏军
Owner CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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