地聚合物新型固井胶凝材料及其抗盐性能分析

发布时间：2018-12-18 11:53

【摘要】：针对深井高盐环境中水泥浆固井胶凝材料耐腐蚀性低的问题,提出了地聚合物作为一种潜在新型固井胶凝材料的可行性,并对其抗盐性进行了实验分析。通过测量粉煤灰+偏高岭土基地聚物和G级油井水泥在不同浓度盐溶液中养护28 d的抗压强度,发现水泥试件随着盐溶液浓度提高,强度损失增大,而地聚物试件的强度却随着盐浓度的提高逆势提升。通过XRF元素分析、XRD矿物分析、酸碱性分析发现,盐水环境中的离子交换显著改变了水泥的水化环境和生成物成分,导致其强度显著降低,但对地聚物的地质聚合反应产物影响甚微。扫描电子显微镜SEM下的形貌分析表明,盐水环境可使地聚物产生更加致密的微观结构,这是其强度提高的主要原因。该研究表明,早龄期地聚物具有优异的抗盐性能,可在进一步加强实验验证后考虑在深井高盐腐蚀环境中代替水泥使用。
[Abstract]:Aiming at the problem of low corrosion resistance of cement slurry cementing material in deep well and high salt environment, the feasibility of geopolymer as a potential new cementing material is put forward, and its salt resistance is analyzed experimentally. By measuring the compressive strength of coal ash metakaolin base polymer and G grade oil well cement cured in salt solution of different concentrations for 28 days, it is found that the strength loss of cement specimen increases with the increase of salt concentration. However, the strength of geopolymers increases with the increase of salt concentration. By means of XRF analysis, XRD mineral analysis, acid and basic analysis, it was found that ion exchange in brine environment changed the hydration environment and the components of the products of cement significantly, resulting in a significant decrease in the strength of cement. However, there is little effect on the geopolymerization products of geopolymers. The morphology analysis under scanning electron microscope (SEM) shows that the salt water environment can make the polymer produce denser microstructure, which is the main reason for the increase of its strength. The results show that the early age geopolymer has excellent salt resistance and can be used instead of cement in deep well high salt corrosion environment after further strengthening the experimental verification.
【作者单位】：渤海钻探工程有限公司第一固井分公司;
【分类号】：TE256

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