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CN-122013005-A - High-strength soluble aluminum alloy material for shale oil gas exploitation tool and preparation method

CN122013005ACN 122013005 ACN122013005 ACN 122013005ACN-122013005-A

Abstract

The invention discloses a high-strength soluble aluminum alloy material for shale oil gas exploitation tools and a preparation method thereof. The tensile strength of the Al-Zn-Mg-Cu alloy is 300-750 MPa, the yield strength is 280-720 MPa, the elongation is 0.5-9%, and the corrosion rates of the alloy in a 3% KCl solution at 93 ℃ are 20-185 Mg cm ‑2 ·h ‑1 respectively. The soluble Al-Zn-Mg-Cu alloy prepared by the method has the advantages of short process flow, excellent strength-plasticity balance, high dissolution rate and capability of being fully dissolved underground without secondary drilling. The Al-Zn-Mg-Cu soluble aluminum alloy has wide application prospect in the field of oil gas exploitation.

Inventors

  • LI BAO
  • LIU YAOHONG
  • GUO YANLIN
  • ZHANG ZHIFENG
  • YANG BICHENG

Assignees

  • 有研金属复合材料(北京)股份公司

Dates

Publication Date
20260512
Application Date
20260215

Claims (8)

  1. 1. The high-strength soluble aluminum alloy material for the shale oil gas exploitation tool is characterized in that the aluminum alloy comprises 4.0-12.0 wt.% of Zn, 1.0-5.0 wt.% of Mg and 0.5-4.0 wt.% of Cu in percentage by mass; m is at least one of Ga, in and Sn, wherein Ga accounts for 0.1-4.0 wt%, in accounts for 0.1-4.0 wt% and Sn accounts for 0.1-4.0 wt%; The balance of Al; The tensile strength of the aluminum alloy is 300-750 MPa, the yield strength is 280-720 MPa, the elongation is 0.5-9%, and the corrosion rate of the alloy in a 3% KCl solution at 93 ℃ is 20-185 mg cm -2 ·h -1 .
  2. 2. The high-strength soluble aluminum alloy material according to claim 1, wherein the tensile strength of the alloy is 400-750 MPa, the yield strength is 300-720 MPa, the elongation is 1.5-8.5%, and the corrosion rate of the alloy in a 3% KCl solution at 93 ℃ is 50-180 mg cm -2 ·h -1 .
  3. 3. The high-strength soluble aluminum alloy material according to claim 1, wherein the aluminum alloy comprises, by mass, 6.0-10.0 wt.% of Zn, 2.0-4.0 wt.% of Mg, and 1.0-3.0 wt.% of Cu; M is at least one of Ga, in and Sn, wherein Ga accounts for 0.5-3.0 wt%, in accounts for 0.5-2.0 wt% and Sn accounts for 0.5-2.0 wt%; The balance being Al.
  4. 4. The high-strength soluble aluminum alloy material according to claim 1, wherein the aluminum alloy further comprises at least one of elements N, wherein N is Sc, zr, ti, er, Y, and each element comprises, by mass, 0.01-0.5 wt.% of Sc, 0.01-0.5 wt.% of Zr, 0.01-0.5 wt.% of Ti, 0.01-0.5 wt.% of Er, and 0.01-0.5 wt.% of Y.
  5. 5. The high-strength soluble aluminum alloy material according to claim 4, wherein M is at least one of Ga, in and Sn, ga is 0.5-3.0 wt.%, in is 0.5-2.0 wt.%, sn is 0.5-2.0 wt.%; N is at least one of Sc, zr, ti, er, Y elements, wherein Sc is 0.1-0.4 wt%, zr is 0.1-0.4 wt%, ti is 0.1-0.4 wt%, er is 0.1-0.4 wt%, and Y is 0.1-0.4 wt%.
  6. 6. A method for preparing the high-strength soluble aluminum alloy according to any one of claims 1 to 5, comprising the steps of: All the raw materials of the aluminum alloy with the design composition are placed in a crucible and are smelted in a well-type resistance furnace at 700-750 ℃, slag is fished and stirred for 15-20 minutes after all the raw materials are melted, then refining is carried out, then the melt is subjected to electromagnetic treatment at 680-720 ℃ with current of 10-100A, frequency of 5-50 Hz and time of 1-30 minutes, immediately after the electromagnetic treatment is finished, the melt is gravity-poured into a mould to cast to obtain corresponding cast ingots, then the obtained cast ingots are subjected to solution treatment with temperature of 350-470 ℃ for 0.5-6 hours and immediately placed into tap water to be cooled after solution treatment, and the cast ingots after water cooling are subjected to aging treatment with temperature of 90-180 ℃ and aging time of 6-48 hours to obtain the high-strength soluble aluminum alloy.
  7. 7. The method for preparing the high-strength soluble aluminum alloy material according to claim 6, wherein after the ingot is obtained, homogenizing air cooling is sequentially carried out on the ingot, wherein the homogenizing temperature is 330-450 ℃ for 6-24 hours, then hot extrusion is carried out on the ingot after air cooling, wherein the preheating temperature and the extrusion temperature of the obtained ingot, an extrusion die and an extrusion cylinder are consistent, the sample preheating time is 1.5-2.0 hours, the preheating time of the extrusion die and the extrusion cylinder is 4-6 hours, the extrusion temperature is 350-440 ℃, the extrusion ratio is 4:1-9:1, the bar obtained after extrusion is immediately placed into tap water for cooling, the solution treatment temperature is 350-470 ℃ for 0.5-6 hours, the solution treatment is immediately placed into tap water for cooling, the aging temperature is 90-180 ℃ and the aging time is 6-48 hours.
  8. 8. The aluminum alloy according to any one of claims 1-5 or the aluminum alloy obtained by the preparation method according to claim 6 or 7 is used for unconventional shale oil and gas exploitation tools, wherein the exploitation tools are fracturing balls, ball seats and bridge plugs.

Description

High-strength soluble aluminum alloy material for shale oil gas exploitation tool and preparation method Technical Field The invention belongs to a functional structure integrated alloy material, and particularly relates to a high-strength soluble aluminum alloy material for shale oil gas exploitation tools and a preparation method thereof. Background Since the last century, unconventional oil gas resources represented by shale oil gas are discovered and gradually become dominant energy sources in the current society, and besides, the reserve of the unconventional oil gas resources in China is rich, so that the exploration and exploitation of the unconventional shale oil gas resources are accelerated, and the unconventional oil gas resources are important strategic requirements for ensuring the national energy safety. The core of shale oil and gas exploitation is the fracturing technology of horizontal well segment reconstruction, and the underground plugging tool is core equipment of the technology. The traditional plugging tools such as steel, cast iron and the like are required to be drilled into powder and extracted from the well after the fracturing operation is finished, so that the operation is long in time consumption, high in cost and complex in operation, blocking is easy to occur, and oil gas cannot be normally discharged to the ground. In order to solve the problems, the existing fracturing plugging tool is developed from a drillable type to a soluble type, and the fracturing plugging tool can be automatically dissolved under the action of flowback fluid after the completion of the operation, so that drilling is not needed, the potential risk of plugging a pipeline is avoided, the cost is reduced, and meanwhile, the oil gas production efficiency is improved. The aluminum alloy has the characteristics of low density, high strength, excellent casting performance, good electric conduction and heat conduction performance and the like, so that the aluminum alloy becomes a preferable material of the soluble tool, and particularly under the extreme service working condition, the temperature, the pressure and the like are increased under a deep well, so that higher requirements are also put forward on the service performance of the soluble tool. Patent document 1 (US 10,352,125 B2) discloses a downhole tool made of a dissolvable aluminum/magnesium alloy and a polymeric acid, which relates to a downhole tool material composed of Al and Mg, si, cu, li or Mn, zn, in metal elements, and mentions that such elements can improve the strength or downhole dissolution rate of the alloy, but specific components and proportions of the alloy are not mentioned, and at the same time, indexes such as tensile strength, yield strength and elongation of the alloy are not given, so that it is impossible to determine whether the downhole operation requirements are met. Patent document 2 (CN 104480354B) discloses a high-strength dissolvable aluminum alloy material, which mainly comprises Sn, si, mn, mg, ga, in and Zn, and also provides specific contents of each element, but the dissolution performance of the alloy is mainly considered to be under 40 ℃ and 50 ℃ instead of the higher exploitation temperature of conventional shale oil gas, and the mechanical properties of the alloy material are not provided, so that the alloy material cannot be compared with the requirements of actual working conditions. Patent document 3 (US 2007/0181224 A1) discloses a soluble metallic material composition comprising a major proportion of one or more active metals and a minor proportion of one or more alloying products, mainly comprising Ga, in, zn, bi or other functional elements. The composition is characterized in that the activity and the degradability of the composition can be controlled under specific conditions, but the compressive strength of the material is low and only reaches tens of megapascals, so that the composition cannot meet the requirement of actual use. Patent document 4 (CN 106834767B) discloses a method for refining grains of a soluble aluminum alloy material, wherein mechanical vibration, an externally applied magnetic field and other methods are adopted, the tensile strength is generally up to 400-600 mpa, and although the mechanical properties are excellent, the corrosion properties of the soluble aluminum alloy material for oil and gas exploitation tools are also required to be considered, but the method is not mentioned. Patent document 5 (CN 106488992B) discloses a high-strength dissolvable aluminum alloy, which contains metal oxides and thus belongs to an aluminum-based composite material. In the given embodiment, the compressive strength of the alloy is lower than 400 MPa, the strength is lower, and in the actual service process, the material is in underground operation, and mainly considered are tensile strength, yield strength and the like, so that whether the alloy meets the service requirement cannot be judge