Research Article
New Online Shunt Acidification for Water Injection Increasing Technology and Its Application in Huanjiang Oilfield
Table 1
The chelating performance of chelate acid COA-1S and other acids.
| Sample | Scale inhibition rate to BaSO4 (%) | Inhibition rate (%) | pH = 3 | pH = 5 | pH = 6 | pH = 7 | CaF2 | Fe(OH)3 | Fluoroaluminate |
| Mud acid | 0.73 | 0.76 | 0.79 | 0.68 | — | — | — | Multihydrogen acid | 3.41 | 5.58 | 7.39 | 9.38 | 60.72 | 36.26 | 31.45 | COA-1S | 15.62 | 64.37 | 78.69 | 89.37 | 98.81 | 96.62 | 96.72 |
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