Effect of nano TiO_(2) and SiO_(2) on gelation performance of HPAM/PEI gels for high-temperature reservoir conformance improvement  

作　　者：Yang Liu Hong-Jun Zhang Dao-Yi Zhu Zi-Yuan Wang Jun-Hui Qin Qi Zhao Yu-Heng Zhao Ji-Rui Hou 

机构地区：[1]China University of Petroleum,Beijing,102249,China

出　　处：《Petroleum Science》2023年第6期3819-3829,共11页石油科学（英文版）

基　　金：supported by the Natural Science Foundation of Xinjiang Uygur Autonomous Region(No.2022D01A250);the CNPC Strategic Cooperation Science and Technology Project(ZLZX2020-01-04-04).

摘　　要：Nanoparticles have been widely used in polymer gel systems in recent years to improve gelation performance under high-temperature reservoir conditions. However, different types of nanoparticles have different effects on their gelation performance, which has been little researched. In this study, the high-temperature gelation performance, chemical structure, and microstructure of polymer gels prepared from two nanomaterials (i.e., nano-SiO_(2) and nano-TiO_(2)) were measured. The conventional HPAM/PEI polymer gel system was employed as the control sample. Results showed that the addition of nano-TiO_(2) could significantly enhance the gel strength of HPAM/PEI gel at 80 ℃. The gel strength of the enhanced HPAM/PEI gel with 0.1 wt% nano-TiO_(2) could reach grade I. The system also had excellent high-temperature stability at 150 ℃. The enhanced HPAM/PEI gel with 0.02 wt% nano-TiO_(2) reached the maximum gel strength at 150 ℃ with a storage modulus (G′) of 15 Pa, which can meet the need for efficient plugging. However, the nano-SiO_(2) enhanced HPAM/PEI polymer gel system showed weaker gel strength than that with nano-TiO_(2) at both 80 and 150 ℃ with G′ lower than 5 Pa. Microstructures showed that the nano-TiO_(2) enhanced HPAM/PEI gel had denser three-dimensional (3D) mesh structures, which makes the nano-TiO_(2) enhanced HPAM/PEI gel more firmly bound to water. The FT-IR results also confirmed that the chemical structure of the nano-TiO_(2) enhanced HPAM/PEI gel was more thermally stable than nano-SiO_(2) since there was a large amount of –OH groups on the structure surface. Therefore, nano-TiO_(2) was more suitable as the reinforcing material for HPAM/PEI gels for high-temperature petroleum reservoir conformance improvement.

关 键 词：Nano-TiO_(2) Nano-SiO_(2) Gel strength Polymer gel High-temperature reservoirs. 

分 类 号：TE62[石油与天然气工程—油气加工工程] TB383[一般工业技术—材料科学与工程]