可抑制稠化异常的新型油井水泥缓凝剂的研究

针对油井水泥缓凝剂在90～150℃内易出现“鼓包”、“台阶”等异常胶凝现象，利用接枝共聚法制得含有支链结构、抑制性强的支化聚合物类缓凝剂DR150，并对其稠化性能及其水泥浆的综合性能进行了评价。评价结果表明，加有DR150的水泥浆体系在90～150℃范围内初始稠度低、稠化时间可调、过渡时间短、温度和加量敏感度小、无倒挂及超缓凝现象，还可有效抑制“包心”等稠化异常现象的发生，综合性能良好。DR150在大庆油田徐家围子区块进行了现场应用，固井质量优质。DR150的研制对保证非常规油气、深层气等资源勘探开发效果，改善深井、超深井的封固质量具有重要的应用价值。 

Study on New Oil Well Cement Retarder Able to Inhibit Abnormal Thickening of Cement Slurry

Oil well cement slurries treated with retarders presently in use experience abnormal gelation between 90℃ and 150℃; in their gelation curves appear "bulge" and "shoulder". A highly inhibitive branched polymer retarder DR150 has been developed through graft copolymerization to address this problem. Laboratory evaluation o indicated that cement slurries treated with DR150 had these characteristics between 90℃ and 150℃, such as, low initial consistency, thickening time that was adjustable, short transition time, low sensitivity to changes in temperature and concentration of DR150, and being free of high temperature reversal and retarding time that is too long. DR150, having good overall properties, is also able to inhibit other abnormal gelation phenomena. The application of DR150 in the Block Xujiaweizi in Daqing Oilfield has gained success; high quality well cementing job was achieved. DR150 is highly valuable in securing the achievement acquired in unconventional hydrocarbon and deeply buried gas exploration and development, and in improving the job quality of deep well/ultra-deep well cementing.