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Magnesium alloy for staged fracturing in oil exploitation and preparation method thereof

A magnesium alloy and magnesium-based alloy technology, which is applied in the fields of mining fluid, earthwork drilling, wellbore/well components, etc., can solve the problems of strong pressure bearing capacity, substandard dissolution rate, and insufficient strength of fracturing balls, etc., and achieve good Good mechanical properties, reduced electrochemical corrosion rate, good solid solution strengthening 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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  • Abstract
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  • Claims
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Problems solved by technology

[0007] Purpose of the invention: Aiming at the problems existing in the prior art, the present invention provides a magnesium alloy for staged fracturing in oil exploitation and its preparation method. The fracturing ball made of the magnesium-based alloy prepared by this method has high toughness and good plasticity , strong pressure bearing capacity, slow dissolution rate in electrolyte solution, meets the needs of high temperature and acidic medium, and solves the problem of insufficient strength and slow dissolution rate of fracturing balls made of metal or non-metallic materials in the prior art The problem of reaching the standard and not easy to flow back

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  • Magnesium alloy for staged fracturing in oil exploitation and preparation method thereof

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Experimental program
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Effect test

Embodiment approach 1

[0035] This embodiment provides a soluble magnesium-based alloy for preparing fracturing balls for oil and gas development, including the following components in weight percentages: Gd: 8%, Al: 5%, Zn: 2%, Y: 2%, Ca: 0.3%, Mg: 82.7%.

[0036] The preparation method of the above-mentioned soluble magnesium-based alloy is as follows:

[0037] Take pure Mg as raw material and Mg-Zn, Mg-Gd, Mg-Al, Mg-Ca and Mg-Y master alloys with powder particles of 20~200μm prepared by powder metallurgy method according to the ratio, and dry all raw materials ;

[0038] S1: Smelting: in CO 2 with SF 6 In a mixed gas atmosphere with a ratio of 300:1, first melt pure magnesium, then add Mg-Zn, Mg-Al and Mg-Ca master alloys with a purity ≥ 99.9% at 680ºC, stir evenly, keep warm for 25min, and cool down to 665ºC. Add Mg-Gd and Mg-Y master alloys with a purity of ≥99.9%, stir evenly, keep warm for 4 minutes, and raise the temperature to 675ºC; inject 0.3MPa, 0.05m 3 / min of argon gas, stir while...

Embodiment approach 2

[0045] 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 5 ; (3) Among the components of the soluble magnesium-based alloy, Gd: 10%, Y: 1%, Mg: 81.7%. .

[0046] Apart from this, this embodiment is completely the same as Embodiment 1, and details are not repeated here.

Embodiment approach 3

[0048] 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 420°C, and the treatment time is 20 hours; (2) the extrusion ratio during S4 extrusion is 15 ; (3) Among the components of the soluble magnesium-based alloy, Gd: 5%, Y: 3%, Mg: 84.7%.

[0049] Apart from this, this embodiment is completely the same as Embodiment 1, and details are not repeated here.

[0050] The dissolution rate of the soluble magnesium-based alloy prepared in Embodiments 1 to 3 above in a 3% KCl solution at room temperature, the dissolution rate in a 3% acidic KCl solution at 120°C, and the pressure parameters that the staged fracturing balls of a horizontal well can withstand are as follows Table 1.

[0051] Table 1

[0052]

[0053] It can be seen from Table 1 that the dissolution rate in 3% acidic KCl solution at room temperature and 120°C is low, and the mechanical properties are good, ...

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Abstract

The invention relates to the field of metal smelting, and discloses magnesium alloy for staged fracturing of petroleum exploitation and a preparation method of magnesium alloy. The soluble magnesium-based alloy is prepared from the following components in percentage by weight: 5%-10% of Gd, 3%-7% of Al, 0.5%-4% of Zn, 1%-3% of Y, 0.1%-0.5% of Ca and the balance of Mg. Compared with the prior art,fracturing balls prepared from the magnesium-based alloy which is prepared by the method have high toughness, good plasticity and high pressure bearing capacity, and meet the requirement of dissolution rate in an electrolyte solution; and thus, the problems that the fracturing balls made of metal or nonmetal cannot be dissolved and are less likely to flow back in the prior art are solved.

Description

technical field [0001] The invention relates to the field of metal smelting, in particular to a magnesium alloy for staged fracturing in oil exploitation 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, whic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/06C22C1/03C22F1/06C22C1/04B22F3/02B22F3/10B22F9/08E21B43/26
CPCB22F3/02B22F3/1007B22F9/082C22C1/03C22C1/0408C22C23/06C22F1/06E21B43/26
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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