Research Article
Chemical Effect on Wellbore Instability of Nahr Umr Shale
Table 2
The formation fluid properties of Halfaya oilfield.
| | Unit | Nahr Umr |
| Water type | | CaCl2 | PH | | 6.3 | Specific gravity (15.56°C) | sg | 1.121 | Resistivity (25°C) | ohm·m | 0.068 | Total salinity | ppm | 166661 | Total hardness | mg/L | 16562 | Na+ | mg/L | 60015 | Ca2+ | mg/L | 8681 | Mg2+ | mg/L | 993 | Fe2+ | mg/L | 74 | Ba2+ | mg/L | 1 | K+ | mg/L | 716 | Sr2+ | mg/L | 356 | Cl− | mg/L | 107098 | | mg/L | 874 | | mg/L | 7263 | | mg/L | 0 | OH− | mg/L | 0 |
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