超缓凝水泥浆体系研究与应用　　

Study and application of ultra-retarding cement slurry system

曹会莲 齐志刚

CAO Huilian QI Zhigang

胜利石油管理局钻井工艺研究院，山东东营　257017

Drilling Technology Research Institute, Shengli Petroleum Administrative Bureau, Dongying 257017, China

针对常规水泥浆稠化时间、流变性、沉降稳定性无法满足膨胀管固井工艺复杂和施工时间长的问题，采用一种新型缓凝剂（CH88），优选出了配套的降失水剂（WJ60S）和减阻剂（CUSZ），设计出了超缓凝水泥浆体系，并对其性能进行了评价。结果表明，在长时间静止情况下，该体系能够保持良好的沉降稳定性，稠化时间达到10 h以上，直角稠化特性明显。现场应用结果表明，该体系浆体性能稳定，施工安全，能够满足膨胀管固井施工要求。

The properties of the conventional cement slurry such as thickening time, rheology and stability cannot meet the requirement of complex technology of expansion pipe cementing and long construction time. A new type of ultra-retarding cement slurry system has been developed to solve this problem, which contains a new type retarder CH88, matched optimal filtrate reducer WJ60S and drag reducer CUSZ. And then its comprehensive properties were studied. The results show that the ultra-retarding cement slurry system can maintain perfect settlement stability in a long time under static condition, with more than 10 hours thickening time, and performs obviously thickening characteristics of right-angle. Field application results represent that the ultra-retarding slurry system was featured by stable performance, safety and convenience used in field, which can satisfy the expansion pipe cementing operation requirements.