Effects of basalt fiber on the performance of aluminate cement stone

In order to further improve the performance of aluminate cement stone used for cementing in heavy oil thermal recovery wells, this paper studies the effects of basalt fiber on the performance of cement stone. Through the measurement of cement slurry engineering performance, mechanical properties and permeability of cement stone, and combined with scanning electron microscope (SEM) to analyze the microstructure, this paper explores the functional mechanism of basalt fiber reinforced aluminate cement stone. The results show that, after adding appropriate amount of basalt fiber into aluminate cement and at low temperature and normal pressure environment, the engineering performance of the cement slurry does not change much, the mechanical properties of the fiber modified cement stone are significantly improved and have obvious toughness. Under high temperature and high pressure, strength and permeability of fiber modified cement stones remain stable, and the fiber cement stone has good high temperature resistance. By observing the microstructure of cement stone and analyzing the functional mechanism of fiber, it is found that basalt fiber maintains stable in aluminate cement stone, the microscopic pore structure of cement stone has been improved, the emergence and development of micro-cracks is under control, the fiber and cement hydration products are bonded tightly, which resists cracking. Fiber breaking away from bonding and being pulled out increases the cement fracture energy, hence improving the performance of aluminate cement stone used in cementing by basalt fiber as a toughening material.