High-plasticity dissolvable magnesium alloy as well as preparation method and application thereof

A technology of magnesium alloy with large plasticity, which is applied in earthwork drilling, wellbore/well components, sealing/package, etc., and can solve the problems of poor plasticity of soluble magnesium alloys, achieve low component content, reduce costs, reduce The effect of cost of use

Inactive Publication Date: 2020-10-30
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem of poor plasticity of soluble magnesium alloys, the present invention provides a large plasticity soluble magnesium alloy and its preparation method and application. It has good plasticity, high strength, and its dissolution rate can be adjusted. It can be applied to the isolation tools or parts that require high plasticity in the fracturing reconstruction of oil and gas fields.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] This embodiment provides a large plastic dissolvable magnesium alloy, the ratio by weight percentage is: Zn: 1%, Gd: 0.5%, Y: 0.3%, Al: 0.1%, Cu: 0.1%, and the balance is Mg .

[0022] Provide a kind of preparation method of above-mentioned soluble magnesium alloy, concrete steps are as follows:

[0023] (1) Add various raw materials into the melting furnace in proportion and heat at 720°C. After all the metals are melted, pass through the argon gas to refine the alloy solution; let it stand for 35 minutes, and lower the temperature of the heating furnace to 700°C. The melt is cast into molds to produce ingots.

[0024] (2) The alloy ingot is machined to cut off the surface scale, the clean ingot is heated to 400° C., and the ingot is processed into a bar under the conditions of an extrusion speed of 4 mm / s and an extrusion ratio of 20.

[0025] (3) Heating the bar at 180°C for 18 hours to obtain a large plastic soluble magnesium alloy.

[0026] In this embodiment, t...

Embodiment 2

[0028] This embodiment provides a large plastic dissolvable magnesium alloy, and the ratio by weight percentage is: Zn: 2%, Gd: 0.8%, Al: 0.2%, Cu: 0.2%, and the balance is Mg.

[0029] A method for preparing the above-mentioned soluble magnesium alloy is provided, and the specific steps are the same as those in Example 1.

[0030] The yield strength of the magnesium alloy obtained in this embodiment is 170MPa, and the elongation in the radial direction and axial direction is respectively 29% and 28% at room temperature; at 90°C and under the condition of 10000ppm chloride ion concentration in the aqueous medium, the alloy dissolution rate is 42mg / cm 2 h. The soluble magnesium alloy can be applied to isolation tools or parts that require greater plasticity in oil and gas field fracturing reconstruction construction.

Embodiment 3

[0032] This embodiment provides a large plastic dissolvable magnesium alloy, and the ratio by weight percentage is: Zn: 2.5%, Y: 1%, Al: 0.3%, Cu: 0.3%, and the balance is Mg.

[0033] A method for preparing the above-mentioned soluble magnesium alloy is provided, and the specific steps are the same as those in Example 1.

[0034] The yield strength of the alloy obtained in this embodiment is 178MPa, and the elongation in the radial direction and the axial direction is 28% and 26% respectively; at 90°C and under the conditions of 10000ppm chloride ion concentration in the water medium, the alloy dissolution rate is 50mg / cm 2 h. The soluble magnesium alloy can be applied to isolation tools or parts that require greater plasticity in oil and gas field fracturing reconstruction construction.

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Abstract

The invention discloses a high-plasticity dissolvable magnesium alloy as well as a preparation method and application thereof. The high-plasticity dissolvable magnesium alloy is composed of the following components of, in percentage by mass, 1%-3% of Zn, 0.1%-0.3% of Al, 0.1%-0.3% of Cu, 0.1%-1% of rare earth metal and the balance Mg, and the rare earth metal is at least one of Gd and Y. The preparation method comprises the following steps of casting to obtain a cast ingot, heating to 380-420 DEG C, processing the cast ingot into a bar under the conditions that the extrusion speed is 2-5mm / s and the extrusion ratio is not less than 16, and heating at 150-200 DEG C for 18-24 hours to perform heat treatment, thus obtaining the high-plasticity dissolvable magnesium alloy. The elongation of the dissolvable magnesium alloy at room temperature is greater than 25%, the dissolvable magnesium alloy has good plasticity and high strength in both the radial direction and the axial direction, the dissolution rate of the dissolvable magnesium alloy is adjustable, and the dissolvable magnesium alloy can be applied to packer tools or parts requiring large plasticity in oil and gas field fracturingtransformation construction.

Description

technical field [0001] The invention belongs to the technical field of soluble magnesium alloys, and in particular relates to a large plastic soluble magnesium alloy and its preparation method and application. Background technique [0002] A large number of oil and gas resources are distributed in shale, and these resources are distributed in formations of different depths. Due to the characteristics of low permeability, it is difficult to exploit them. Such oil and gas resources are usually exploited by hydraulic fracturing technology. In fracturing construction, soluble magnesium isolation tools (bridge plugs and fracturing balls) are widely used to seal off the construction string, and then the shale formation is fractured by high-pressure fracturing fluid. Since the isolation tool is soluble, the construction period and mining cost are saved. [0003] At present, the commonly used soluble sealing tools do not have high requirements on the plasticity of magnesium alloys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/04C22F1/06C22C1/02E21B33/134
CPCC22C1/02C22C23/04C22F1/06E21B33/134
Inventor 胡德高刘军张炜汪伟刘翔李文戈乔闻川管斌
Owner CHINA PETROLEUM & CHEM CORP
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