1. Easily cause fire

2. It is easy for workers, equipment and sites to be exposed to oil pollution.

3 Oil-based costs are relatively high

4. The selection range of additives soluble in oil is small, the cost is high, and the modification effect is not as good as that of water-based fluids.

5. The viscosity of oil is higher than that of water, and the friction resistance is greater than that of water.

6. Oil has large filter loss

7. The density of oil is small and the liquid column pressure is low, which is beneficial to the liquid flowback after fracturing of low-pressure oil layers, but the pumping pressure needs to be increased.

8. Oil has good compatibility with underlying rocks and liquids, and basically does not cause water blockage, emulsion blockage, and clay expansion and migration to reduce formation permeability.

Oil-based fracturing fluid is suitable for low-pressure, highly water-sensitive formations.