A combination of moderate apparent viscosity, temperature resistance, and low damage is highly desired for fracturing fluids used in high-temperature reservoirs. The aim of this study is to achieve this combination by introducing inorganic nanolayered montmorillonite (MMT) to form a high-temperature-resistant and metallic-crosslinker-free intercalated nanocomposite fracturing fluid (GMN). The exfoliated MMT was uniformly dispersed and connected with polymer chains of guar gum to form a highly three-dimensional cross-linked network, which resulted in increased apparent viscosity and viscoelasticity of GMN compared with the guar gum fracturing fluid. Temperature resistance tests and thermogravimetric analyses demonstrated that the nanofiller enhanced the thermal stabilities of the nanocomposites, and this was attributed to three effects, including high chemical bond energies, heat barriers and minimization of chain free volumes in MMT. In the absence of a metallic crosslinker and temperature stabilizer, the resistance temperature of the GMN fracturing fluid reached 160 °C, a 40 °C enhancement compared to that of the guar gum fracturing fluid. Moreover, the GMN fracturing fluid were easily broken and exhibited a 10.34% damage rate to provide the desired fracture conductivity. It was concluded that layered MMT effectively improved the temperature resistance of guar gum fracturing fluid and exhibited great potential for use in high-temperature reservoirs.

高温储层中使用的压裂液非常需要中等表观粘度、耐温性和低损伤的组合。本研究的目的是通过引入无机纳米层状蒙脱石（MMT）形成耐高温且不含金属交联剂的插层纳米复合压裂液（GMN）来实现这种组合。剥离的MMT均匀分散并与瓜尔胶聚合物链连接形成高度三维交联网络，与瓜尔胶压裂液相比，GMN的表观粘度和粘弹性耐温测试和热重分析表明，纳米填料增强了纳米复合材料的热稳定性，这归因于三个效应，包括高化学键能、热障和 MMT 中链自由体积的最小化。在没有金属交联剂和温度稳定剂的情况下，GMN 压裂液的电阻温度达到了 160 ℃，比瓜尔胶压裂液的电阻温度提高了 40 ℃。此外，GMN压裂液易破碎，破坏率达10.34%，可提供所需的裂缝导流能力。结果表明，层状MMT有效提高了瓜尔胶压裂液的耐温性，在高温油藏中表现出巨大的应用潜力。