Research Article
Effect of Nitric Acid on the Low Fluorescing Performance of Drilling Fluid Lubricant Based Animal and Vegetable Oils
Table 5
The evaluation of lubricity for E167.
| | Type of mud | Content of E167 (%) | (%) | (%) | Testing condition |
| | Fresh water mud | 0.5 | 77.55 | 79.14 | At room temperature | | 1.0 | 77.55 | 76.82 | At room temperature | | 1.0 | 71.33 | 70.27 | Thermal ageing 180°C × 16 h and then at room temperature |
| | Brine mud | 0.5 | 75.00 | 62.43 | At room temperature | | 1.0 | 77.08 | 66.60 | At room temperature | | 1.0 | 73.55 | 64.30 | Thermal ageing 180°C × 16 h and then at room temperature |
|
|
