The cement ring of the oil well will produce micro-cracks, which will cause channeling in the annulus, affecting actual production. Therefore, self-healing cement has great value in oil well applications. In this paper, using N, N-dimethylformamide as the catalyst, DL-malic acid and bromopropene as raw materials, the self-repairing material (CWS) was synthesized by suspension polymerization with dibenzoyl peroxide as an initiator at 60 °C in the water bath. CWS was characterized by FTIR (FTIR Spectromete) and NMR (Nuclear Magnetic Resonance Spectrometer). The effect of CSW on self-healing performance of micro-cracks in cement stone is evaluated by fracture permeability and strength recovery rate. The results showed that the permeability of cement stone decreases by 97.5%, and the strength recovery rate is 92.7% after adding CWS, which can obviously improve the self-healing ability of cement paste and has good compatibility with cement stone. The mechanism of CWS promoting self-healing of cement stone was analyzed through a series of microscopic characterization. CSW can effectively improve the pore structure of cement, and the average recovery rate of cement stone porosity is 31.64%. When micro-cracks occur in the cement matrix and water is immersed, CWS can chelate Ca²⁺ ions in cement to form water-soluble chelates and migrate to pores or cracks and react with unhydrated cement to form insoluble acicular crystals such as C–S–H (Hydrated calcium silicate gel)to seal cracks.

油井水泥环会产生微裂纹，造成环空窜流，影响实际生产。因此，自愈合水泥在油井应用中具有很大的价值。在本文中，使用N , N以-二甲基甲酰胺为催化剂，DL-苹果酸和溴丙烯为原料，以过氧化二苯甲酰为引发剂，在60℃水浴中悬浮聚合合成自修复材料（CWS）。CWS通过FTIR（FTIR光谱仪）和NMR（核磁共振光谱仪）表征。CSW对水泥石微裂缝自愈性能的影响通过裂缝渗透率和强度恢复率进行评价。结果表明，水泥石渗透率降低97.5%，加入CWS后强度恢复率为92.7%，能明显提高水泥浆体的自愈能力，与水泥石相容性好。通过一系列微观表征分析了水煤浆促进水泥石自愈的机理。CSW能有效改善水泥的孔隙结构，水泥石孔隙率平均回收率为31.64%。当水泥基体出现微裂纹并浸入水中时，CWS 可螯合 Ca水泥中的²⁺离子形成水溶性螯合物并迁移到孔隙或裂缝中，并与未水化的水泥反应形成不溶性针状晶体，如 C-S-H（水合硅酸钙凝胶）以密封裂缝。