WH-7 has a strong infiltration and infiltration of the drilling process,and permeates in the wall of mud cake quickly, then mud cake will be spread out erosion, thereby to enhance the water slurry and the contact surface of the cement capacity.
WH-7 has good compatibility with drilling mud.
Table 1 Physical and chemical property
| Items | Specification |
| Appearance | liquid |
Table 2 Formula of flushing fluid
| Name | Specification | Content, g | Ratio |
| Water | Hot water ( 50℃ ) | 600 | 100 |
| Flushing fluid | WH-7 | 60 | 10 |
Table 3 Cleaning effect of flushing fluid
| Items | Test condition | Specification |
| Flushing efficiency ( 10min ), % | Fan viscosimeter outer barrel dipped in crude oil, speed: 300 r/min,
solution temperature: ≥ 38℃ |
≥ 80.0 |
WH-7 is diluted to 2 ~ 50% aqueous solution.The flushing fluid dosage of each well is designed according to the annular height of 300 meters, and can be formulated according to the actual well cementing design.
