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High-ductility soluble magnesium-lithium alloy and preparation method and application thereof

A magnesium-lithium alloy and ductility technology, applied in the field of magnesium-lithium alloys, can solve the problems of incomplete degradation of rubber cartridges and low ductility of sealing tools, and achieve the effects of improving plasticity, refining grains and simplifying the preparation process.

Pending Publication Date: 2021-11-19
郑州轻研合金科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention aims at problems such as the low ductility of the sealing tool, the incomplete degradation of the rubber cylinder, and a certain proportion of insoluble materials in the field application in the fracturing construction of the existing oil and gas field, by designing the alloy composition and adopting vacuum melting and casting , low-temperature large plastic deformation processing and heat treatment, etc., a high-ductility soluble magnesium-lithium alloy has been obtained. The elongation of the alloy is not less than 45%, and its excellent plastic deformation performance can be used to manufacture downhole tools. , and further accelerated the research and development process of all-metal soluble bridge plugs

Method used

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  • High-ductility soluble magnesium-lithium alloy and preparation method and application thereof
  • High-ductility soluble magnesium-lithium alloy and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0034] A high ductility soluble magnesium-lithium alloy consisting of the following components in mass percentage: Li: 9.0%, Al: 0.3%, Zn: 0.2%, Ni: 0.4%, Cu: 0.3%, Gd+Y+Ce ≤0.2%, the impurity elements Na and K are less than 0.001%, the balance is Mg and unavoidable impurities; the mass ratio of Gd, Y, and Ce is: 1:1:2.

[0035] The preparation method of the high-ductility soluble magnesium-lithium alloy, the specific steps are as follows:

[0036] (1) Preparation of ingots: Take pure lithium ingots, pure magnesium ingots, pure aluminum ingots, pure zinc ingots, Mg-30Ni master alloys, Al-50Cu master alloys, Mg-30Y master alloys, Mg-30Gd master alloys and Mg- 30Ce intermediate alloy, and carry out batching according to the mass percentage of each component in the alloy, adopt vacuum furnace to carry out alloy casting, obtain ingot (wherein the casting method adopts existing technology, and is not the innovation point of the present invention, so no longer repeat);

[0037] (2) ...

Embodiment 2

[0042] A high ductility soluble magnesium-lithium alloy consisting of the following components in mass percentage: Li: 11.5%, Al: 0.5%, Zn: 0.6%, Ni: 0.7%, Cu: 0.6%, Gd+Y+Ce ≤0.2%, the impurity elements Na and K are less than 0.001%, and the balance is Mg and unavoidable impurities; the mass ratio of Gd, Y, and Ce is: 1:1:4.

[0043] The preparation method of the high-ductility soluble magnesium-lithium alloy, the specific steps are as follows:

[0044] (1) Preparation of ingots: Take pure lithium ingots, pure magnesium ingots, pure aluminum ingots, pure zinc ingots, Mg-30Ni master alloys, Al-50Cu master alloys, Mg-30Y master alloys, Mg-30Gd master alloys and Mg- The 30Ce master alloy is mixed according to the mass percentage of each component in the alloy, and the alloy is cast in a vacuum furnace to obtain an ingot;

[0045] (2) Large plastic deformation at low temperature: The ingot obtained in step (1) is turned to remove the scale on the surface of the ingot, heated to 2...

Embodiment 3

[0049] A high ductility soluble magnesium-lithium alloy consisting of the following components in mass percentage: Li: 10.0%, Al: 1.2%, Zn: 0.5%, Ni: 0.5%, Cu: 0.5%, Gd+Y+Ce ≤0.2%, the impurity elements Na and K are less than 0.001%, the balance is Mg and unavoidable impurities; the mass ratio of the three elements Gd, Y, and Ce is: 1:2:1.

[0050] The preparation method of the high-ductility soluble magnesium-lithium alloy, the specific steps are as follows:

[0051] (1) Preparation of ingots: Take pure lithium ingots, pure magnesium ingots, pure aluminum ingots, pure zinc ingots, Mg-30Ni master alloys, Al-50Cu master alloys, Mg-30Y master alloys, Mg-30Gd master alloys and Mg- The 30Ce master alloy is mixed according to the mass percentage of each component in the alloy, and the alloy is cast in a vacuum furnace to obtain an ingot;

[0052] (2) Large plastic deformation at low temperature: The ingot obtained in step (1) is turned to remove the oxide skin on the surface of th...

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Abstract

The invention belongs to the technical field of magnesium-lithium alloys, and particularly relates to a high-ductility soluble magnesium-lithium alloy and a preparation method and application thereof. Aiming at the problems of low ductility, incomplete dissolution and the like of a packing tool in fracturing transformation construction of an oil and gas field, the high-ductility soluble magnesium-lithium alloy is obtained through alloy component design and by adopting the processes of vacuum casting, low-temperature severe plastic deformation, heat treatment and the like, and the alloy is prepared from the following components in percentage by mass: 9.0-12.0% of Li, 0-2.5% of Al, 0.1-1.0% of Zn, 0.1-1.0% of Ni, 0.2-1.0% of Cu, less than or equal to 1.0% of RE, and the balance of Mg. The tensile strength of the prepared magnesium-lithium alloy is not lower than 120 MPa, the yield strength is not lower than 90 MPa, the ductility is not lower than 45%, and the magnesium-lithium alloy can be used for machining and preparing high-plasticity soluble downhole tools used in the oil and gas field fracturing process, such as all-metal full-bore soluble bridge plugs, sealing rings or sealing rings.

Description

technical field [0001] The invention belongs to the technical field of magnesium-lithium alloys, and specifically relates to a high-ductility soluble magnesium-lithium alloy and its preparation method and application. Parts such as bridge plugs or sealing rings. Background technique [0002] At present, my country's produced oil and gas resources mainly include medium-high permeability oil fields represented by Daqing Oilfield, low-permeability oil fields represented by Changqing Oilfield, and unconventional oil and gas resources represented by tight oil and shale gas. Among them, medium-high permeability oilfields and permeable oilfields have entered the ultra-high water-cut period and medium-high water-cut period respectively, and it is more difficult to improve the recovery factor. Although unconventional oil and gas reservoirs are rich in resources, the recovery factor is also low due to poor resource quality and low single well production. [0003] In recent years, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/00C22F1/06C22C1/03E21B33/12E21B33/134
CPCC22C23/00C22F1/06C22C1/03E21B33/12E21B33/134
Inventor 解海涛张瑷月肖阳刘志鹏刘金学高华李吴铭赵彬
Owner 郑州轻研合金科技有限公司
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