HE Cheng, YANG Yongchao, CAO Jianwei, DU Yu, YU Yanjun, XIONG Zhongqiang, LI Ningtao, WANG Libing
(Technical Center for Safety of Industrial Products of Tianjin Customs, Tianjin 300308, China)
Abstract: With the continuous increase in the exploitation of oil, the need for petroleum fracturing proppant is continuously increased. Petroleum fracturing proppant with low-density and high-strength were prepared using fly ash solid waste as the main raw material with eight compositions. Microstructure and phase compositions of the samples sintered at different temperatures were characterized by using scanning electron microscope (SEM) and X-ray diffraction (XRD). The effects of sintering temperature and time on bulk densities and anti-fragmentation capability of the samples were analyzed and discussed. The petroleum fracturing proppant sintered at 1160 ℃ for 60 min possessed the lowest crushing rate of only 18.2 % at the closing pressure of 52 MPa, while the corresponding bulk density was 1.165 g/cm3. High strength petroleum fracturing proppant contained corundum, mullite and anorthite as the main crystal phases which were formed at high temperatures. Therefore, after sintering at 1160 ℃, the phase crystallization was completed, dense microstructure was developed and excellent mechanical properties were achieved.
Key words: low-density; high-strength; fly ash; fracturing proppant; bulk density; crushing rate