To address the issues of cement ring brittleness failure and gas channeling in geothermal and oil and gas cementing, it is often necessary to incorporate fiber, latex, resin and other toughening materials into the cement. This study aims to investigate the effect of basalt fiber (BF), styrene butadiene latex (SBL), and epoxy resin (ER) on the performance of class G oil well cement. Different proportions of BF, SBL and ER were added into the cement slurry, and their rheological properties, setting time, and mechanical properties were tested. The microstructure of the mixture with good performance was further examined. The test results indicate that good rheological and mechanical properties could be obtained by the cement with 0.6% BF and 10% SBL. The 7 days compressive and flexural strength of the optimized cement formula are 28.6 MPa and 3.7 MPa, respectively. The development of cement microcracks can be controlled by BF through bridging and friction. The addition of SBL makes the cement matrix become denser and improves the strength and toughness of cement with BF.

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