高强度超低密度水泥浆体系实验研究

Lab Experiment on High-Intensity Ultra-Low-Density Cement Slurry

国内外利用颗粒级配和紧密堆积理论研究开发了1．20～1．65kg／L的低密度水泥浆体系，解决了固井中的许多技术难题。但是，对于密度为1．15～1．30kg／L的超低密度水泥浆体系还缺乏系统的研究。以最紧密堆积和颗粒级配理论为依据，建立了最佳模型，精选出了以G级水泥、微细水泥、空心微珠和玻璃微珠为主体的四级颗粒级配系统，配合适量的激活剂研究出了密度为1．15～1．30kg／L的超低密度水泥浆体系，并率先在实验室模拟出了超低密度水泥浆返至地面的室温候凝施工过程。解决了低密度水泥浆体系的稳定性和高早期强度等难题，具有良好的性能和现场推广应用价值。

The 1.20 -1.65 kg/L low density cement slurry developed at home and abroad using the theory of particle size distribution and close packing solved a lot of problems in cementing and achieved satisfactory results. However, cement slurry with 1.15-1.30 g/cm^3 hasn＇t ever been investigated systematically. According to the theory of particle size distribution and close packing,the best model was developed, and the G-class cement, fine cement, hollow beads, glass beads as the main composition of the four particle size distribution system was selected. With the appropriate amount of activated agent, the cement slurry for density of 1.15-1.30 g/cm^3 for the ultra-low-density cement slurry system were created. Retardation construction process of the low-density cement slurry returning to the ground was simulated in laboratory under room temperature. Stability and high early strength problems of the low-density cement slurry system were solved.