“…The reason for this is that carbon fiber, as a fiber with high strength and high elastic modulus, can significantly toughen oil well cement. 26 Based on the original cement slurry formulation, the flexibilizer was introduced and the amount of filtrate reducer and dispersant was increased. The optimized formula is 600 g of G-grade cement + 40% strengthening agent + 4.5% flexibilizer + 2% suspension agent + 6% filtrate reducer + 3% dispersant + 4.5% retarder + water; the ratio of liquid to solid is 0.42, and its density is 1.9 g/cm 3 .…”