The effect of cations on gelation of cross-linked polymers

• 作者: POURAFSHARY Peyman RAZAVI Seyed Ali SEDAGHATZADEH Mostafa SHAHBAZI Khalil
• 来源期刊: 石油勘探与开发:英文版
• 学科: 工学
• 关键词: CROSS-LINKED polymer GEL system RHEOLOGICAL property stability CATION multi-walled carbon nano-tubes
• 年，卷（期）: 2019,（4）
• 页码范围: 826-832
• 页数: 7页
• 分类号: TE39

摘要

The effects of different cation concentrations and types on rheological property and stability of Guar, Xanthan, and Partially Hydrolyzed Polyacrylamide(HPAM) cross-linked gels were analyzed through experiments. Also, a new approach was developed to reduce the negative effects of cation by application of multi-walled carbon nano-tubes(MWCNTs). The presence of cations in cross-linked gel system will reduce the viscosity of gel, the higher the cation concentration is, the lower the viscosity will be. The bivalent cation has a greater viscosity reduction effect on gel than monovalent cation. The stability of cross-linked gels is worse with cations, this situation becomes more serious under higher salinity. MWCNTs were added to HPAM gel, cross-linked by(3-Aminopropyl) triethoxysilane(APTES), they surrounded cations and removed them from polymers and reduced the reaction possibility. This method enhances the viscosity and breakdown pressure of cross-linked gels, improves the stability of HPAM cross-linked gel under different operating conditions, and can be applied to related drilling projects.