Due to the influence of complex downhole conditions and inherent brittleness of cement, cement is easily broken, resulting in interlayer sealing failure. To solve this problem, basalt fiber is used to enhance the mechanical properties of cement paste. However, due to the weak adhesion between the fiber and the cement base, the excellent mechanical properties of the basalt fiber cannot be fully exerted. Therefore, the surface of the basalt fiber was modified. The basalt surface was treated by KH-550, the surface of basalt fiber was loaded with silica by the sol–gel method. The chemical structure and elemental composition of the basalt fiber were analyzed with IR and EDS, and the morphologies of the fiber surface and composite material were analyzed with SEM. The fiber monofilament is drawn to analyze the performance of the basalt fiber interface, and after modification, the bonding performance between the basalt interface and the cement is enhanced. The flexural strength and compressive strength of cement-based composites were tested. The results showed that the flexural strength and compressive strength of modified fiber cement were 27.7% and 25.2% higher than those of blank cement and 10.7% and 16.1% higher than those of the unmodified basalt fiber cement. The interface bonding performance between modified basalt fiber and cement matrix was enhanced. The analysis showed that the modified basalt fiber cement effectively improved the toughness of oil well cement and cementing quality.

由于复杂的井下条件和水泥固有的脆性的影响，水泥容易破裂，导致层间密封失败。为了解决这个问题，玄武岩纤维用于增强水泥浆的机械性能。然而，由于纤维与水泥基之间的弱粘合性，所以不能充分发挥玄武岩纤维的优异的机械性能。因此，玄武岩纤维的表面被改性。玄武岩表面经过KH-550处理，玄武岩纤维表面通过溶胶-凝胶法负载了二氧化硅。用IR和EDS分析了玄武岩纤维的化学结构和元素组成，并用SEM分析了纤维表面和复合材料的形貌。绘制纤维单丝来分析玄武岩纤维界面的性能，改性后，玄武岩界面与胶结剂的粘结性能增强。测试了水泥基复合材料的抗弯强度和抗压强度。结果表明，改性纤维水泥的抗弯强度和抗压强度比空白水泥高27.7％和25.2％，比未改性玄武岩纤维水泥高10.7％和16.1％。改性玄武岩纤维与水泥基体之间的界面粘结性能得到增强。分析表明，改性玄武岩纤维水泥能有效提高油井水泥的韧性和固井质量。结果表明，改性纤维水泥的抗弯强度和抗压强度比空白水泥高27.7％和25.2％，比未改性玄武岩纤维水泥高10.7％和16.1％。改性玄武岩纤维与水泥基体之间的界面粘结性能得到增强。分析表明，改性玄武岩纤维水泥能有效提高油井水泥的韧性和固井质量。结果表明，改性纤维水泥的抗弯强度和抗压强度比空白水泥高27.7％和25.2％，比未改性玄武岩纤维水泥高10.7％和16.1％。改性玄武岩纤维与水泥基体之间的界面粘结性能得到增强。分析表明，改性玄武岩纤维水泥能有效提高油井水泥的韧性和固井质量。