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Magnesium alloy and its preparation method

A technology of magnesium alloy and master alloy, which is applied in the direction of earthwork drilling, mining fluid, wellbore/well components, etc. It can solve the problems of difficult flowback and fracturing balls that cannot dissolve by themselves, and achieve the effect of promoting dissolution and strong solid solution strengthening , fast melting effect

Active Publication Date: 2020-10-16
江苏奇纳新材料科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Purpose of the invention: Aiming at the problems existing in the prior art, the present invention provides a magnesium alloy and its preparation method. The fracturing ball made of the soluble magnesium alloy prepared by this method has high toughness, good plasticity, and strong pressure bearing capacity. The dissolution rate in the electrolyte solution meets the requirements, and solves the problems in the prior art that the fracturing balls made of metal or non-metal materials cannot dissolve by themselves and are not easy to flow back

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0031] This embodiment provides a soluble magnesium alloy for preparing fracturing balls for oil and gas development, including the following components in weight percentages: Al: 8%, Cu: 5%, Pb: 2%, Zr: 0.2%, Dy : 1%, Mg: 83.8%.

[0032] The preparation method of above-mentioned soluble magnesium alloy is as follows:

[0033] Take pure Mg as raw material and Mg-Al, Mg-Cu, Mg-Pb, Mg-Zr and Mg-Dy master alloys with powder particle size of 20~200μm prepared by powder metallurgy method according to the ratio, and dry all raw materials

[0034] S1: Smelting: in CO 2 with SF 6 In a mixed gas atmosphere with a ratio of 300:1, first melt pure magnesium, and then add granular Mg-Al, Mg-Cu, Mg-Pb, Mg with a purity of ≥99.9% and a particle size of 0.1~2mm at 680ºC -Zr master alloy, stir well and keep it warm for 15 minutes, add granular Mg-Dy master alloy with a purity ≥ 99.9% and a particle size of 0.1~2mm, stir it evenly, keep warm for 4 minutes, and heat up to 690ºC; 0.3MPa, 0.05...

Embodiment approach 2

[0041] This embodiment is roughly the same as Embodiment 1, the difference is only that (1) during S3 homogenization heat treatment, the heat treatment temperature is 400°C, and the treatment time is 20 hours; (2) during S4 extrusion, the extrusion ratio is 5 (3) Among the components of the soluble magnesium alloy, Pb is 4%, Zr: 0.1%, Dy: 0.5%, Mg: 82.4%.

[0042] Apart from this, this embodiment is completely the same as Embodiment 1, and details are not repeated here.

Embodiment approach 3

[0044] This embodiment is roughly the same as Embodiment 1, the difference is only that (1) during S3 homogenization heat treatment, the heat treatment temperature is 350°C, and the treatment time is 40 hours; (2) the extrusion ratio during S4 extrusion is 15 (3) Among the components of the soluble magnesium alloy, Pb is 0.5%, Zr: 0.3%, Dy: 2%, Mg: 84.2%.

[0045] Apart from this, this embodiment is completely the same as Embodiment 1, and details are not repeated here.

[0046] The dissolution rate in 3% KCl solution at room temperature, the dissolution rate in 3% KCl solution at about 90°C, and the pressure parameters that can be withstood by staged fracturing balls in horizontal wells of the soluble magnesium alloy prepared in Embodiments 1 to 3 are as follows 1.

[0047] Table 1

[0048] Dissolution rate in 3% neutral KCl solution at 50℃ Dissolution rate in 3% acid KCl solution at 50℃ Dissolution rate in 3% neutral KCl solution at 90℃ Dissolution rate in...

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Abstract

The invention relates to the field of metal smelting, and discloses a magnesium alloy and a preparation method thereof. The magnesium alloy is prepared from following components in percent by weight including 5%-12% of Al, 1%-8% of Cu, 0.5%-4% of Pb, 0.1%-0.3% of Zr, 0.1%-2% of Dy and the balance Mg. Compared with the prior art, a fracturing ball prepared from the soluble magnesium alloy preparedwith the method is high in toughness, good in plasticity and high in pressure bearing capacity, the dissolution rate in an electrolyte solution meets the requirements, and the problems that in the prior art, a fracturing ball prepared from metal or non-metal materials cannot be dissolved by itself and cannot easily flow back are solved.

Description

technical field [0001] The invention relates to the field of metal smelting, in particular to a magnesium alloy and a preparation method thereof. Background technique [0002] Among my country's new proven oil and gas reserves in recent years, low-permeability unconventional oil and gas resources have reached 70%, and the proportion of low-permeability oil and gas production in my country will continue to increase in the future. The stable and increased production of oil and gas production will rely more on Low permeability unconventional oil and gas resources. The development of these unconventional oil and gas resources requires the use of multi-layer and multi-stage fracturing technology. In the downhole layered and segmented fracturing, temporary plugging tools are required to isolate the layers. Tool removal. [0003] One of the key components of the staged fracturing technology for horizontal wells is the fracturing ball, which is the main factor determining whether t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/02C22C1/03C22F1/06C22C23/00C22C1/04B22F3/02B22F3/10B22F9/08E21B43/26
CPCB22F3/02B22F3/1007B22F9/082C22C1/03C22C1/0408C22C23/00C22C23/02C22F1/06E21B43/26
Inventor 彭伟平陈业高赵虎杨建红赵泽综彭凌剑
Owner 江苏奇纳新材料科技有限公司
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