Anti-swelling agent for shale gas fracturing

• Main Authors: DONG ZHUYONG, PAN XIAOCHU, LI QINGSHAN, WANG XINWEI, ZHOU GENPING, LIN FANGYAN, WU JIANPING, LIU YUEHUA, SHI XUSHENG, PAN QUNYANG
• Format: Patent
• Language: Chinese; English
• Published: 17.11.2020
• Subjects: ADHESIVES; CHEMISTRY; COMPOSITIONS BASED THEREON; DYES; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; ORGANIC MACROMOLECULAR COMPOUNDS; PAINTS; POLISHES; THEIR PREPARATION OR CHEMICAL WORKING-UP

The invention discloses an anti-swelling agent for shale gas fracturing, which is characterized by consisting of the following components: maleic anhydride, an aziridine cross-linking agent, quaternary ammonium base or a mixture of quaternary ammonium salt and potassium hydroxide, KCl and a solvent in a mass ratio of 5:10-20:10-15:10:65-50, and uniformly mixing the raw materials to obtain a mixture, namely, the anti-swelling agent for shale gas fracturing. The anti-swelling agent provides a composite solution for solving the problem of natural gas permeability reduction caused by migration andswelling effects of clay in shale and constraint effects of organic matters on water. Compared with a traditional anti-swelling agent, the anti-swelling agent not only considers the structure problemof clay during clay swelling, but also considers the problem of water content in a shale environment, and has more excellent anti-swelling performance. 本发明公开了一种页岩气压裂用防膨剂，其特征在于，该防膨剂由以下组分组成：马来酸酐、氮丙啶交联剂、季铵碱或季铵盐与氢氧化钾混合物、KCl和溶剂，各原