江苏省自然科学基金 (BK20161128), MOE & SAFEA for the 111 Project (B13025)
School of Chemistry and Materials Engineering,Jiangnan University,Wuxi
为了提高黄原胶的基本性能,用C12 ~ 14烷基缩水甘油醚与黄原胶反应,得到疏水改性黄原胶(DXG),研究了DXG溶液的流变性能(剪切变稀特性、粘弹性、触变性),并对其作为压裂液的基本性能(耐温耐剪切性、耐盐性、携砂性能)进行了研究。研究表明：疏水改性后黄原胶溶液的粘度较改性前明显增加,在0.5 wt%的浓度下,表观粘度最大增加252%。改性后黄原胶样品溶液的储能模量G'、损耗模量G'、粘弹性、触变性、耐温、耐剪切性能和耐盐性均有提高。用Cross模型拟合改性前后黄原胶溶液的剪切变稀行为曲线,显示优良的相关性。改性黄原胶可用于压裂液,具有增稠、降低用量和优化流体性能的优点。
Hydrophobic modified xanthan gum was prepared by a reaction of dodecyl and tetradecyl glycidyl ethers with xanthan gum for improving its basic performance. The rheological properties(shear thinning, viscoelasticity and thixotropy),temperature and shear resistance, salt resistancep and roppant carrying capacity of the solution were studied. The results showed that the viscosity of the modified xanthan gum solution was significantly increased compared with that before modification. The maximum viscosity increase was 252% at the concentration of 0.5wt%. The storage modulus G', loss modulus G', viscoelasticity, thixotropy, temperature and shear resistance of the modified xanthan gum solution were also improved. Cross model was used to fit the shear thinning behavior curve of xanthan gum solution, showing good correlation. The modified xanthan gum could be used in fracturing fluid, showing advantages of thickening, reducing dosage and optimizing fluid performance.