GH-7 can stick on the surface of cement hydrate to inhibit contacting between cement and water, also stick on the surface of crystal nucleons to prevent their enlarging. So it can retard hydrating of cement slurry.
GH-7 consists of various kinds of compounds, such as gluconate and hydroxycarboxylic acid.
Density: 1.30 g/cm3.
It is non-poisonous, non-odor, and non-corrosion.
Normal dosage: 0.2% ~ 2.0% ( BWOC ). The amount can be appropriately increased with the increase of temperature.
It can reduce the consistency of cement slurry and improve the rheology.
Retard the thickening time efficiently.
Generally used in oil wells whose circulate temperature under bore is between 110℃ to 140℃.
| Appearance | Reddish-brown liquid |
| Thickening time | Adjustable |
| Initial consistency, Bc / 120℃, 73.9MPa, 61min | ≤ 30.0 |
| Mutation value of thickening curve, Bc | ≤ 10.0 |
| Transition time, min | ≤ 40.0 |
| Free liquid, % | ≤ 1.4 |
| Compression strength, MPa / 144℃, 21MPa, 48h | ≥ 14.0 |
The ingredient of cement slurry in the table is: G class cement 594g + silica sand 208g ( 160 mesh ~ 200 mesh ) + G310 agent 5% + G401 agent 1.5% + distilled water 305g + GH-7 agent 0.2% ~ 2.0%.
Be stored in 25L plastic drums.
Be kept away from moisture and possible damage of the packages during transportation, and it can be stored in cool and dry situation.
Storage life time is one year.
