New Insights and Experimental Investigation of High-Temperature Gel Reinforced by Nano-SiO2

Gels

Ziwei Li¹  Guoliang Zhang²  Wenhui Wang³  Mingjia Liu³  Longjie Li³  Jijiang Ge³  Hongbin Guo³ 

[1] Petroleum Engineering and Technology Institute, SINOPEC Jiangsu Oilfield Company, Yangzhou 225009, China;Research Institute of Exploration and Development, Tarim Oilfield Company, PetroChina, Korla 841000, China;School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China;

关键词: reinforced high-temperature gel;    HPAM;    water-soluble phenolic resin;    nanoparticles;    syneresis;   

DOI  :  10.3390/gels8060362

来源: DOAJ

【 摘 要 】

The properties of a reinforced gel with partially hydrolyzed polyacrylamide (HPAM) as the main agent, water-soluble phenolic resin (WSPR) as the crosslinker, and nano-SiO₂ as the stabilizer were evaluated in terms of gelation time, gel strength and thermal stability under the conditions of 110 °C and 12.124 g/L salinity in water. The results showed that the gelation time of the gel with high strength was adjustable from 3 to 23 h, remaining stable for more than 180 days under stratigraphic conditions, although with a certain degree of early dehydration in the gel. Cryo-scanning electron microscopy (cryo-SEM) and dynamic light scattering (DLS) analysis revealed that nano-SiO₂ improves the dispersion of the polymer in water, resulting in a more homogeneous structure of the formed gel and thus improving the strength of the gels. In addition, rheological tests and cryo-SEM showed that the interaction between nano-SiO₂ and the polymer could inhibit the degradation of polymer to a certain extent and improve the thermal stability of the gel. However, the oxidative degradation of the gel is still the main cause of early dehydration of water-soluble phenolic resin gel, and the addition of a small amount of hydroquinone to the gelants can significantly improve the antioxidative degradation properties of phenolic resin gel.

【 授权许可】

Unknown