Microstructure and Properties of Soluble Alloy Used for Fracturing Separation Tools
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摘要: 开发和制备了Mg-Ca-Zn-Fe-Ni-Cu可溶合金，对铸态和热挤压态合金的显微组织和力学性能进行了对比，研究了热挤压态合金的溶解性能、应用性能等。结果表明：试验合金的密度约为1.8 g·cm-3，组织由α-Mg、Mg2Ca、Mg2Ni、Mg2Cu及Mg6Ca2Zn3等相组成，热挤压态合金的基体相和析出相尺寸均小于铸态合金的，并沿热挤压方向分布；经热挤压处理后合金的抗拉强度和伸长率增大，硬度升高；热挤压态合金的溶解速率随温度的升高而增大，室温浸泡24 h后合金的质量损失率为40%，而60 ℃浸泡24 h后合金已完全溶解；采用挤压态合金加工的压裂球在90 ℃和70 MPa下的压降比为0.86%，密封性良好；现场试验结果显示该合金压裂球的应用效果良好。Abstract: The Mg-Ca-Zn-Fe-Ni-Cu soluble alloy were developed and prepared. The microstructure and mechanical properties of the cast and hot-extruded alloy were compared, and the dissolving property and application performance of the hot-extruded alloy were investigated. The results indicate that the test alloy with density of 1.8 g·cm-3 was composed of α-Mg,Mg2Ca,Mg2Ni,Mg2Cu and Mg6Ca2Zn3 phases. The matrix phase and precipitated phase of hot-extruded alloy distributed along the extrusion direction and exhibited a smaller size than the cast alloys. The tensile strength, elongation and hardness of alloy were increased after hot-extruding. The soluble rate of hot-extruded alloy increased when temperature rose. The hot-extruded alloy showed a mass loss of 40% after dissolved for 24 h at room temperature while dissolved completely after 24 h at 60℃. The pressure drop rate of frac-ball fabricated by hot-extruded alloy was 0.86% under 70 MPa at 90℃, which showed a good leakproofness. Field test results showed that the frac-ball had an excellent application performance.
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Keywords:
- separation tool /
- soluble alloy /
- dissolving property
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