关键词:  激发, 低温促凝, 粉煤灰, 水泥窑灰, 固井

Abstract:  The evaluation of cement kiln dust (CKD) in fly ash oil well cementing slurry was established at 20 ℃ , and the substitution amounts of cement kiln dust to mixed materials ( prepared by 50 % API G cement and 50 % fly ash) were 0 % , 5 % , 15 % and 30 % , respectively. The results showed that with the increase in kiln dust, the duration of its induction period shortened, the time of reaching the peak of heat flow more and more in advance, and the static gel strength development time and thickening time got shortened. It indicateds that CKD had the effects of early strength development at low temperature. Although the apparent viscosities of cement slurries were decreased with the substitution amounts increased, the density difference of cement column was still in the range of 0. 025 to 0.033 g /cm3 and API fluid loss presented a trend of decrease which indicated that CKD had the effects of stabilizing the cement slurry. The accumulative heat and the maximum temperature rise during 6 day hydration were decreased gradually with substitution amounts increased, which might be due to the non cementing material of CKD. From above results, CKD should have an application potential in developing cement slurry systems with early strength and low hydration heat at low temperatures for offshore deepwater wells.

Key words:  , activate, acceleration at low temperature, fly ash, cement kiln dust, well cementing