新型抗高温水泥浆体系的研究及应用

Research and application of a new type of high-temperature slurry system

为了解决塔里木油田高温高压深井存在的水泥浆稠化时间突变、水泥浆沉降稳定性变差、水泥石强度衰退等一系列问题,需要研发新的抗高温体系以提高水泥浆体系抗高温能力及浆体稳定性并降低其温敏性,以确保高温深井固井施工安全、提升固井质量。研究内容包括:①新型抗高温缓凝剂A研发及性能评价,缓凝剂A是以AMPS和IA(衣康酸)为原料合成的共聚物,耐温达到180℃,无温度倒挂现象;②新型抗高温悬浮剂B研发及性能评价,悬浮剂B是AMPS、丙烯酰胺(AM)和N-乙烯基吡咯烷酮(NVP)的共聚物,悬浮能力强,耐温可达200℃;③新型抗高温水泥浆体系综合性能评价,配套使用细目硅粉,可防止水泥石高温强度性能倒退。应用效果及结论:①新型抗高温缓凝剂A对温度、掺量不敏感,具有良好的缓凝作用,适用温度高;②加入新型抗高温悬浮剂B的水泥浆无包心、稠度下降的现象。经200℃高温养护形成的水泥浆上下密度差小,达到了提高水泥浆高温稳定性的目的,并且该高温悬浮剂具有适应温度范围宽、配伍性好等优点;③新型抗高温水泥浆体系应用温度范围为100~180℃,综合性能优良,后期高温强度稳定,该体系在克XX井进行了试验,取得了良好的应用效果。

The high-temperature, high-pressure deep wells in Tarim Oilfield are suffered from a series of prob. lems. For example, the thickening time of slurry changes abruptly, the settlement stability of slurry deteriorates and the strength of set cement declines. In order to solve these problems, it is necessary to research and develop a new type of temperature resisting system to improve the high temperature resistance and stability of slurry system and de. crease its temperature sensitivity, so as to ensure the cementing operation safety of high-temperature deep wells and improve the cementing quality. The following test results were obtained. First, the novel high-temperature retardant A is insensitive to temperature and dosage and does well in retardation, and its applicable temperature is high. Second, the slurry with the novel high- temperature suspending agent B doesn't present the phenomena of"aberrant gela. tion"and thickness decline. After the slurry is cured at 200℃, its upper and lower density difference is small, so the target of improving the high-temperature stability of slurry is realized. In addition, this high-temperature suspending agent is advantageous with wide applicable temperature range and good compatibility. Third, the applicable tempera. ture range of this novel high-temperature slurry system is 100-180℃, its comprehensive performance is good and its late high-temperature strength is stable. This system is tested in Well Ke XX, and its application effect is satisfactory.