用于提高水泥浆封固能力的树脂体系性能评价

Performance Evaluation of Resin System for Improving the Sealing Capacity of Cement Slurry

郭远曜 许明标 宋建建 胡 顺 张 敏 倪超武

GUO Yuanyao XU Mingbiao SONG Jianjian HU Shun ZHANG Min NI Chaowu

为获得较好的封固效果，室内制备了一种带有特殊亲水基团的环氧树脂，并与相应的固化剂混合制备了树脂体系，分析了该树脂体系的固化温度、热稳定性等物理性能，研究了该树脂体系对水泥浆封固能力的影响，并使用扫描电镜和能谱分析仪研究了树脂水泥浆的微观结构。研究表明，所合成的环氧树脂与相应的固化剂混合后的固化效果好，固化温度在39.9℃至164.6℃之间，在243.9℃以下固化物热稳定性较好。将树脂体系掺入油井水泥浆中，能显著提高水泥石的封固能力。与空白水泥浆相比，含15%树脂体系的水泥浆所形成的水泥石，渗透率由空白组的 0.037×10-3 μm2降至 0.023×10-3 μm2，降低了 37.8%；胶结强度由 1.8 MPa 增至 3.2 MPa，提高了77.8%；弹性模量由9.86 GPa降至4.08 GPa，降低了58.6%。水泥石的微观结构表明，树脂与水泥浆固化后，树脂的固化产物与水化产物混合形成整体，未反应的树脂聚合物颗粒填充在水泥石内部形成柔性结构中心，两种作用共同提高水泥浆封隔能力。

In order to obtain better sealing effect，a kind of epoxy resin with special hydrophilic group was prepared in the laboratory，and the resin system was prepared by mixing the epoxy resin with the corresponding curing agent. The physical properties such as curing temperature and thermal stability of the resin system were analyzed，the effect of the resin system on the sealing ability of cement slurry was studied，and the microstructure of resin cement slurry was studied by scanning electron microscope and energy spectrum analyzer. The results showed that the curing effect of the epoxy resin mixed with the corresponding curing agent was good. The curing temperature was between 39.9℃ and 164.6℃，and the thermal stability of the cured product was good below 243.9℃. When the resin system was added into the oil well cement slurry，the sealing capacity of the cement paste could be significantly improved. Compared with the blank cement slurry，the permeability of cement paste formed by the cement slurry with 15% resin decreased from 0.037×10-3 μm2 to 0.023×10-3 μm2，decreasing by 37.8%；the cementation strength increased by 77.8% from 1.8 MPa to 3.2 MPa；the elastic modulus decreased from 9.86 GPa to 4.08 GPa，decreasing by 58.6% . The microstructure of cement paste showed that after the resin and cement slurry were solidified，the solidified products and hydration products of the resin was mixed to form a whole，and the unreacted resin polymer particles were filled in the cement paste to form a flexible structure center. The two functions jointly improve the sealing ability of cement slurry.