Table 4 Compatibility of formation fluid filtrate with fracturing fluid and tap water.
Well No. | Appearance of the filtrate | After adding fracturing fluid for 1 h | After adding water for 1 h |
|---|---|---|---|
1 | Colorless clarification | No precipitation | No precipitation |
2 | |||
3 | |||
4 | |||
5 | Milk yellow microemulsion | Yellow milky, no sediment | Yellowing and becoming turbid, without sediment |
6 | Colorless clarification | No precipitation | No precipitation |
7 | |||
8 | Yellow clarification | ||
9 | Colorless clarification |
