| Requirements | unit | Specification |
| Purity as NaCl | % | 97 min |
| Water insoluble Solids | % | 1 Max |
| Moisture Content | % | 0.5 Max |
| Remaining on ASTM Sieve No.16(Mesh 14) | % | Nil |
| Remaining on ASTM Sieve No.50(Mesh 48) | % | 98 min |
|
After adding 127 gr NaCl to 350 ml Water |
||
| Mud Weight | PCF | 75 |
| Clˉ | ppm | 314000 min |
| Mg++, Ca++ | ppm | 500 max |
Mineral
Sodium Chloride
Sodium chloride has multiple functions in drilling and completion fluids. It is used to increase the fluid density, reduces the freezing point of water base drilling fluids, inhibits hydrate formation, provides shale control. Additionally, it can be used as an internal brine for oil or synthetic base drilling fluids to balance formation salinity and avoid osmotic transport. It is used as a base brine for completion and workover fluids. It has advantageous over other divalent brines as it is monovalent and has no precipitation issues.