铝合金可溶压裂球的水解机理分析及性能探究

Study on Hydrolysis Mechanism and Properties of Aluminum Alloy Soluble Fracturing Ball

针对常规钢制压裂球压裂完成后破碎成本高、影响采收效率等问题,采用铸造成型方法,以铝作为可溶压裂球金属基材,在Al-Ga合金的基础上,引入Mg_(2)Sn相与In_(3)Sn相,降低活化能,与铝形成腐蚀微原电池,促进水解。可溶压裂球水解速率随溶液温度上升及NaCl浓度增加而增加。利用固溶+时效处理的方式强化铝合金力学性能。结果表明:在不同固溶温度下,铝合金压裂球维氏硬度最大可达123 HV,抗压强度最大为733.1 MPa。在温度为70℃,浓度3%NaCl溶液中平均溶解速率为1.75 g/h,最大溶解速率可达2.03 g/h,直径为Φ70 mm的压裂球263 h即可完全溶解。

In order to solve the problems of high crushing cost and low recovery efficiency of conventional steel fracturing balls after fracturing,the casting molding method was adopted.Aluminum was used as the metal base material of soluble fracturing balls.Based on Al-Ga alloy,Mg_(2)Sn phase and In_(3)Sn phase were introduced to reduce the activation energy and form corrosive microgalvanic cells with aluminum to promote hydrolysis.The hydrolysis rate of soluble fracturing balls increases with the increase of solution temperature and NaCl concentration.The mechanical properties of aluminum alloy were strengthened by solution and aging treatment.The results show that the maximum Vickers hardness and compressive strength of aluminum alloy fracturing ball can reach 123 HV and 733.1 MPa at different solution temperatures.At 70℃and the concentration of 3%NaCl solution,the average dissolution rate is 1.75 g/h,and the maximum dissolution rate can reach 2.03 g/h.The fracture ball with the diameter of Φ70 mm can be completely dissolved in 263 h.