Formula optimization and rheology study of clean fracturing fluid

Clean fracturing fluid is a kind of environmentally friendly and non-polluting fracturing fluid. In order to obtain the clean fracturing fluid formula with low-dose surfactant and study the rheological properties of clean fracturing fluid, an indoor experiment was carried out. Firstly, through the optimization experiments, the main agent and the main agent concentration were determined. Based on the analysis of the effects of different inorganic and organic micelle promoters on the main agent by experiments, the type of additive and additive concentration were determined, and ultimately formed the clean fracturing fluid formula. Secondly, by means of viscometer and rheometer, the fluid type of the clean fracturing fluid was discussed, and the effects of temperature, inorganic salts, organic matter, as well as the pH value were also investigated. The experimental results indicate that the preferred clean fracturing fluid belongs to pseudoplastic fluid; temperature, inorganic salts and organic matter have significant effect on the system, and the pH value has little effect. Finally, with the help of Cryo-TEM, the microstructure of the clean fracturing fluid was verified. And the Cryo-TEM images show that the clean fracturing fluid system consists of a large number of winding wormlike structures, which is consistent with the rheological results.