Research on the Cement-based Smart Lost-circulation Control Material with Ti-Ni SMA

摘要

Different heat-treatments were carried out on the Ti-Ni shape memory alloy, alloy thread was made to straight line with the self-made alignment on 500°C and then self-made angle training meter was used to train the alloys. Cement-based smart materials were prepared by the method of rolling agglomeration. Finally, indoor simulation experiment was carried out. The results show that the shape recovery ration becomes lower when quenching medium are hot-oil, hot-water, cold-oil and cold-water. The smart lost-circulation control material response quickly to external environment, the time from contact with external environment to the begin of distortion is less than or equal to five seconds, and to the end of distortion is less than or equal to sixty seconds. The best volume fraction for cement-based smart plugging material in cement slurry is 20%. Furthermore, the lost-circulation control material possesses the characteristics of a short time plugging and a strong pressure-bearing capability after plugging. And it improves the capacity of the ordinary cement-based smart lost-circulation control material.