Table 5 Acid cleaning effect of HCR in well F.
Layer | Minerals | Acid type | Acid content m3 | Pressure drops MPa | Pump displacement(m3/min) | Acid soaking time min | Instantaneous shut-in pressure (Isip) MPa | |
|---|---|---|---|---|---|---|---|---|
Before acid leaching | After acid leaching | |||||||
Xu-2 | 5%-10% carbonatite | HCl | 10 | 2.63 | 3.65 | 5.88 | 15 | 78.32 |
80%-85% quartz | HCR | 11 | 0 | 3.02 | 3.66 | |||
Xu-4 | 80%-90% quartz | HCl | 10 | 10.20 | 3.82 | 6.68 | 30 | 74.78 |
Xu -4 | 70%-80% CaCO₃ | HCl | 10 | 14.83 | 3.82 | 12.00 | 30 | 74.78 |
