Oil well cement is a brittle material, which can not ensure the long-term sealing integrity of oil and gas wells when used in cementing operations directly. As a kind of polymer emulsion material, epoxy resin emulsion has a bright future for improving the properties of the cement slurry. Epoxy resin emulsion was added to oil well cement and its workability and mechanical properties were studied, the stress-strain behavior of cement samples was evaluated, and the microstructure was observed by scanning electron microscope (SEM) and X-ray diffraction (XRD). The results show the epoxy resin emulsion used in oil well cement will affect the fluidity, but the rheological property of cement slurry with different content of resin meets the construction requirements. The resin reduces the water loss of cement paste and has no adverse effect on the thickening time. The compressive strength of cement stone decreases with the increase in resin content. When the content of resin is 6%, the flexural strength and impact strength of the cement sample are the largest, and 50.7% and 20.2% higher than that of the specimen without resin, respectively, after curing for 28 days. Further comparison shows that epoxy resin emulsion can improve the mechanical properties of oil well cement better than styrene-butadiene rubber latex. Meanwhile, the resin obviously improves the deformability and decreases the elastic modulus of cement stone. Compared with pure cement, resin cement slurry has no extra hydration products, but the formation of hydrated calcium silicate is inhibited. The microstructure shows that the resin forms a polymer film in the cement matrix and interweaves with cement hydration products, thus improving the flexibility of cement paste.

中文翻译：

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环氧树脂乳液对油井水泥基复合材料力学性能的影响

油井水泥是一种脆性材料，当直接用于固井作业中时，不能确保油气井的长期密封完整性。作为一种聚合物乳液材料，环氧树脂乳液在改善水泥浆性能方面具有广阔的前景。将环氧树脂乳液添加到油井水泥中，研究其可加工性和力学性能，评估水泥样品的应力应变性能，并通过扫描电子显微镜（SEM）和X射线衍射（XRD）观察其微观结构。结果表明，油井水泥中使用的环氧树脂乳液会影响流动性，但不同树脂含量的水泥浆的流变性能满足施工要求。该树脂减少了水泥浆的水分流失，并且对增稠时间没有不利影响。水泥石的抗压强度随树脂含量的增加而降低。当树脂含量为6％时，固化28天后，水泥样品的弯曲强度和冲击强度最大，分别比不含树脂的样品高50.7％和20.2％。进一步比较表明，环氧树脂乳液比苯乙烯-丁二烯胶乳能更好地改善油井水泥的力学性能。同时，该树脂明显改善了水泥石的可变形性并降低了其弹性模量。与纯水泥相比，树脂水泥浆液没有多余的水合产物，但可以抑制水合硅酸钙的形成。