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首页> 外文期刊>Journal of Applied Polymer Science >Viscoelastic behavior of hydrogel-based xanthan gum/aluminum lactate with potential applicability for conformance control
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Viscoelastic behavior of hydrogel-based xanthan gum/aluminum lactate with potential applicability for conformance control

机译：水凝胶的黄原胶/铝乳液的粘弹性行为，具有潜在适用性控制

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摘要

Gel systems composed of biopolymers can be used, which block the regions of high water permeability during a previously established period, through the in situ formation of a gel inside the rock pores. Among the biopolymers studied, xanthan gum has attracted the greatest attention due to its viscosifying power and good stability in reservoirs subject to severe salinity and temperature from 27 to 90 degrees C. Xanthan chains have the ability to build up physical networks with metals such as aluminum lactate to form hydrogels. Therefore, the objective of this study was to prepare and evaluate, hydrogels made from xanthan gum (XG) cross-linked with aluminum lactate. Initially, the influence of the gel formulation (biopolymer concentration and cross-linker) and the reservoir conditions (pH, temperature, salinity) of the gel strength of the system and the injectivity of the gel systems was investigated through rheological tests. Subsequently, was analyzed the morphology of the systems for 30 days by scanning electron microscopy (SEM). The results showed that the systems based on xanthan gum cross-linked, were able to form strong gels at pH 8, temperature of 70 degrees C and salinity of 29,940 mgL(-1) TDS. In general, the evaluated parameters (pH, temperature, salinity, polymer concentration, and cross-linker) had a direct effect on the initial strength of the gel. However, after aging for 30 days, a drop in gel resistance was observed, since all systems have similar tan (delta) values and these parameters no longer show significant influence The aging analysis of hydrogel systems by SEM showed a difference in the surface microstructure of the dry hydrogel over the 30 days.
机译：可以使用由生物聚合物组成的凝胶系统，通过在岩石孔隙内原位形成凝胶，在先前确定的时间段内封堵高透水性区域。在所研究的生物高聚物中，黄原胶因其增粘能力和良好的稳定性而备受关注。在盐度和温度为27至90摄氏度的储层中，黄原胶具有与乳酸铝等金属建立物理网络以形成水凝胶的能力。因此，本研究的目的是制备和评估黄原胶（XG）与乳酸铝交联的水凝胶。最初，通过流变试验研究了凝胶配方（生物聚合物浓度和交联剂）和储层条件（pH、温度、盐度）对系统凝胶强度和凝胶系统注入能力的影响。随后，通过扫描电子显微镜（SEM）分析30天内系统的形态。结果表明，基于黄原胶交联的体系在pH 8、温度70℃、盐度29940mg L（-1）TDS下能够形成强凝胶。通常，评估参数（pH、温度、盐度、聚合物浓度和交联剂）对凝胶的初始强度有直接影响。然而，在老化30天后，观察到凝胶阻力下降，因为所有系统具有相似的tan（δ）值，并且这些参数不再显示出显著影响。通过SEM对水凝胶系统进行的老化分析显示，在30天内，干水凝胶的表面微结构存在差异。

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