新型缓凝剂BCR-260L性能评价及现场试验

Performance Evaluation and Application of Novel Retarder BCR-260L

针对深井长封固段固井时顶部水泥浆超缓凝的问题,研制了一种新型缓凝剂BCR-260L。通过室内试验评价了缓凝剂BCR-260L的缓凝性能、大温差条件下水泥石强度发展、抗盐性能,结果表明:该缓凝剂具有很好的耐高温性能,适用温度范围广,可满足循环温度70～180℃固井需求;根据现场对水泥浆稠化时间的要求,可通过调整缓凝剂BCR-260L的加量,调节水泥浆的稠化时间;缓凝剂BCR-260L对水泥石后期强度发展基本无影响,在大温差条件下强度发展快,能保证固井施工时顶部水泥浆强度发展;缓凝剂BCR-260L抗盐能力可达15%。现场应用表明,缓凝剂BCR-260L可以有效解决高温大温差条件下顶部水泥浆超缓凝的问题,具有广泛应用前景。

With regard to the problem of super-retarding of top slurry for the long-section cementation in deep well,a new type of retarder BCR-260L was developed.Through lab experiment,the retarding performance,strength development of cement with huge temperature difference,salt-resistance performance of BCR-260L was evaluated.The results indicated that,its performance under high temperature condition is good with a wide application range of temperature,which could satisfy the demand for the cementation under the circulating temperature of 70-180 ℃.Based on the requirement of field for slurry thickening time,the addition of BCR-260L could be adjusted to regulate the thickening time of slurry.BCR-260L has little effect on the strength development of set cement at the late stage.The strength develops rapidly under huge temperature difference,which could ensure the development of strength of the top slurry.The salt-proof capacity of BCR-260L is enough to resist 15% concentration of salt.The field application indicates that BER-260L could effectively solve the problem of super-retarding of top slurry under the huge temperature difference,it can be used widely in the future.