漂珠低密度水泥浆在安棚碱井的应用

安棚区块地层破裂压力低，地层易漏失；碱井矿化度高，矿石易溶蚀，导致井壁存在不同程度的“葫芦串”，井径不规则，固井施工顶替效果差。上部井段采用漂珠低密度水泥浆进行固井施工，下部目的层（碱层段）仍使用常规密度水泥浆。漂珠低密度水泥浆配方为：夹江G级水泥 37.5%漂珠 1.8%KJS-1 1.5%KJS-2 0.2%S501。漂珠水泥浆在高温条件下具有足够的稠化时间和良好的流动性，保证了固井施工安全，顺利，现场应用表明，漂珠低密度水泥浆有效地解决了安棚碱井易漏地层长封固段固井难题，确保了安棚碱井的固井质量。2000年固井4井次，上部漂珠段固井1次合格率为100%，碱层段固井优质率达到100%。

Microsphere low density cement slurry and its application in Anpeng alkali wells

In Anpeng area, microsphere low density cement was used in upper section formation, and high density cement was used in intended interval for the problems of low fracturing pressure, leaki-ness, high salinity, ore dissolving existing in the formation which led to irregular borehole and bad cementing effect. Microsphere low density cement slurry is composed of Jiajiang Class G cement+37. 5% microsphere +1. 8%KJS-1+1.5%KJS-2+0.2%S501. Field application showed microsphere low density cement slurry has enough thickening time and good flowability in high temperature condition. Lost circulation problems of long interval isolation have been solved by using the cement slurry to 4 Anpeng alkali wells in 2000, and cementing qualification rate of upper section and cementing quality excellent rate of alkali lay all reached 100%.