Research and Application of Solid Composite Microsphere Low-Density Cement Slurry System

Abstract Low-density cement slurry is essential for addressing cementing challenges in low-pressure, permeable formations. In response to the issues of poor shear stability, susceptibility to breakage, and unstable density in traditional pumice low-density cement slurries, a solid composite microsphere low-density weight reducer CMA was used in the laboratory to improve cementing quality and address the cement slurry leakage problem in low-pressure, easy-to-leak wells. A low-density cement slurry system with solid composite microspheres was developed. Experimental results show that this low-density cement slurry system has good sedimentation stability, low fluid loss, strong pressure resistance, and good density stability under high-speed shear conditions. The application was carried out at Well CH2, solving the cementing leakage problem of Well CH2, with a 100% qualified rate for cementing quality, achieving good construction results.