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Preparation method for cast soluble magnesium alloy composite fracturing ball surface protection layer

A technology of composite materials and fracturing balls, which is applied in the direction of surface reaction electrolytic coatings, devices for coating liquid on the surface, coatings, etc., can solve the problem that the protective effect of fracturing balls needs to be improved, and the protection methods and process parameters are rarely reported. , affect the surface quality of micro-arc oxidation ceramic coatings, etc., to achieve good protection, compact structure, and high interface bonding strength

Inactive Publication Date: 2018-12-21
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention patent (application number 201710381832.6) declared by the project team in the early stage discloses a fracturing ball made of soluble magnesium alloy composite material and its preparation method. It uses ordinary lathes and carbide tools to cut the fracturing ball blank, and A protective ceramic film was prepared on the surface of the soluble fracturing ball by micro-arc oxidation method. Although the protective layer of the soluble fracturing ball can also be successfully prepared, the spherical surface is processed by ordinary lathes and carbide tools. It is still difficult to ensure the machining accuracy and surface roughness, which also affects the surface quality of the micro-arc oxidation ceramic coating in the later stage. In addition, the protective effect of the ceramic protective coating formed after micro-arc oxidation on the fracturing ball still needs to be improved.
In summary, soluble fracturing balls and soluble downhole tools cannot be dissolved before the fracturing operation is completed, and surface protection must be carried out, but the specific protection methods and process parameters are rarely reported

Method used

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  • Preparation method for cast soluble magnesium alloy composite fracturing ball surface protection layer
  • Preparation method for cast soluble magnesium alloy composite fracturing ball surface protection layer
  • Preparation method for cast soluble magnesium alloy composite fracturing ball surface protection layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The floating beads / magnesium alloy composite material soluble fracturing balls in this embodiment include the following composition by weight percentage: 6% floating beads, 15% Al, 3% Zn, 0.5% Cu, 1% Ni, and the balance is Mg . The raw materials used are 100-150 mesh floating beads (see Table 1 for components), AZ91D magnesium alloy ingot, industrial pure aluminum plate (99.5wt.%), pure zinc powder (95.0wt.%), pure nickel powder (99.5wt.%) %), pure copper powder (99.7wt.%). The particle size of raw materials is: zinc powder 20μm-50μm, copper powder 20μm-40μm, nickel powder 20μm-50μm.

[0029] Table 1 components of floating beads

[0030]

[0031] The specific preparation process is as follows: firstly, 100-150 mesh floating beads are screened out with a sampling sieve, and then alkali washing is carried out to remove impurities on the surface of the floating beads. The alkali washing step is: prepare a sodium hydroxide aqueous solution with a concentration of 1.5m...

Embodiment 2

[0036] The difference between this example and Example 1 is that the inventive float / magnesium alloy composite soluble fracturing ball comprises the following composition by weight percentage: 8% float, 15% Al, 3% Zn, 0.5% Cu, 1% Ni, the balance is Mg.

[0037] When the cutting process parameters are cutting depth of 2.0mm, cutting speed of 35m / min, and feed rate of 0.05mm / r, the surface roughness is relatively low, and the Ra value is 0.33μm.

[0038] The concentration of the micro-arc oxidation electrolyte used is 8g / L Na 2 SiO 3 and 2g / L KOH, when the micro-arc oxidation process parameter is the current density 35A / dm 2 When the pulse frequency is 25Hz, the duty ratio is 50%, and the oxidation time is 40min, the roughness Ra of the ceramic coating obtained on the surface of the floating beads / magnesium alloy soluble fracturing ball is 1.4μm, and the anti-corrosion performance is good, which meets the production requirements.

Embodiment 3

[0040] The difference between this example and Example 1 is that the inventive soluble floating beads / magnesium alloy composite fracturing ball comprises the following composition by weight percentage: 6% floating beads, 12% Al, 3% Zn, 0.5% Cu, 1% Ni, the balance is Mg.

[0041] When the cutting process parameters are cutting depth of 1.5mm, cutting speed of 45m / min, and feed rate of 0.05mm / r, the surface roughness is relatively low, and the Ra value is 0.48μm.

[0042] The concentration of the micro-arc oxidation electrolyte used is 6g / L Na 2 SiO 3 and 3g / L KOH, when the micro-arc oxidation process parameter is the current density 40A / dm 2 When the pulse frequency is 55Hz, the duty ratio is 50%, and the oxidation time is 50min, the roughness Ra of the ceramic coating obtained on the surface of the floating beads / magnesium alloy soluble fracturing ball is 1.3μm, and the anti-corrosion performance is good, which meets the production requirements.

[0043] Using the mixed sol...

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Abstract

The invention discloses a preparation method for a cast soluble magnesium alloy composite fracturing ball surface protection layer, and belongs to the field of unconventional oil and gas equipment manufacturing. A cast floating bead-magnesium alloy soluble composite fracturing ball is prepared by adopting a stir casting method, wherein the fracturing ball is prepared from, by mass, 6%-8% of floating beads, 12%-15% of Al, 1%-3% of Zn, 0.5%-0.8% of Cu, 0.5%-1% of Ni and the balance Mg; the soluble composite fracturing ball blank is subjected to cutting machining by adopting a numerical control machine tool, a Mitsubishi numerical control blade, a dry cutting mode and optimized cutting process parameters; the surface of the machined fracturing ball is subjected to micro-arc oxidation processing by adopting a mixed aqueous solution of Na2SiO3 and KOH as an electrolyte solution and by adopting optimized process parameters; and the fracturing ball obtained after micro-arc oxidation processing is subjected to soaking processing by adopting a (heptadecafluoro-1,1,2,2-tetradecyl)trimethoxysilane-isopropanol fluorination processing mixed solution with the volume fraction of 1% to enable thesurface to achieve a hydrophobic function. The preparation method for the soluble fracturing ball surface protection layer is simple in process and suitable for industrial production.

Description

technical field [0001] The invention belongs to the field of unconventional oil and gas equipment manufacturing, and relates to a preparation method for the surface protective layer of cast soluble composite material fracturing balls, which uses magnesium alloy as the matrix and floating beads as reinforcements. The purpose is to obtain a casting soluble The optimal method and process parameters of magnesium alloy composite material fracturing ball surface protective coating can be used for downhole soluble tools such as soluble fracturing balls used in multi-stage ball sliding sleeve staged fracturing technology in unconventional oil and gas production preparation. Provide strong technical support for the exploitation of shale gas and tight oil and gas. Background technique [0002] In recent years, with the rapid consumption of conventional oil and gas resources and the increasing difficulty of development, the exploration and development of unconventional oil and gas res...

Claims

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Application Information

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IPC IPC(8): C22C23/02C22C32/00C25D11/30B05D7/14
CPCB05D7/14C22C23/02C22C32/001C25D11/024C25D11/026C25D11/30
Inventor 于思荣牛亚峰刘恩洋杨一聪葛建
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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