双环氧交联改性黄原胶的制备及流变性能研究

The Rheological and Thickening Properties of Modified Xanthan Gum Crosslinked by Diepoxides

为了增强黄原胶在油田开采中的使用性能,本工作以1,4-丁二醇二缩水甘油醚等交联剂分别与黄原胶反应,制备了交联改性黄原胶;对产物结构及其流变性能进行了表征,并对其作为压裂液的基本性能进行了研究。结果表明:改性后黄原胶样品溶液的各项性能显著提高,当交联剂占黄原胶质量的7wt%时,改性后样品溶液的表观粘度增加最大可达6.9倍,优于目前文献报道;同时其剪切变稀特性、粘弹性、触变性、耐温耐剪切性、耐盐性和携砂性能等综合性能明显改善。本研究产物在石油开采中具有良好的应用前景。

To enhance the performance of xanthan gum in oilfield exploitation, the crosslinking modified xanthan gum was prepared through the reaction of 1,4-butanediol diglycidyl ether etc. with xan-than gum. The structure and rheological properties of the product were characterized, and its basic properties as fracturing fluid were investigated. The results showed that the properties of the modified xanthan solution were significantly improved. When the cross-linking agent accounted for 7 wt% of the mass of xanthan, the apparent viscosity of the modified sample solution increased up to 6.9 times, much better than the current literature reports;and the comprehensive properties such as shear thinning, viscoelasticity, thixotropy, temperature resistance, shear resistance, salt resistance and sand carrying capacity were significantly improved. The product has a good applica-tion in the field of oil exploitation.