Abstract: The invention relates to a nanoparticle composite high-temperature guar gum fracturing fluid which comprises a base liquid and a crosslinking agent, wherein the mass ratio of the base liquid to the crosslinking agent is 100:(0.3-0.6); the base liquid comprises the following components in percentage by mass: 0.3-0.6% of a thickening agent, 0.02-0.06% of water-soluble nanoparticles, 0.3-0.5% of a clay stabilizing agent, 0.3-0.5% of a surfactant, 0.1-0.3% of a temperature stabilizing agent and the balance of water; the crosslinking agent is a triethanolamine boron complex; the thickening agent isany one of hydroxypropyl guar gum and carboxymethyl hydroxypropyl guar gum; the water-soluble nanoparticles are SiO2 or ZnO granules of which the particle sizes are 1-10 nm after surface modification; a surface modification method of the water-soluble nanoparticles comprises the following steps: putting 5-15 g of 3-aminopropyl triethoxysilane into 50 ml of an ethanol solution, further adding 4-8g of SiO2 or ZnO nanoparticles, enabling the components to react for 40 minutes, adding 0.01-0.03 g of lauryl sodium sulfate and 4-7 g of an acrylic monomer, and carrying out initialization with 0.01-0.03 g of ammonium persulfate. Due to adoption of the nanoparticles, the network structure of the fracturing fluid can be improved, the temperature resistance and the shearing resistance of the fracturing fluid can be improved, and wide market application prospects can be achieved.
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