Study on Hydrolysis Mechanism and Properties of Aluminum Alloy Soluble Fracturing Ball
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,Mg2Sn phase and In3Sn 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.
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