Anhui Oilfield summarized that problems existed in pure slurry cementing before 1994 were too much water filtration,poor displacement capability,counterflow of cement slurry in the annulus,and etc.

• 安徽油田总结1994年前水泥净浆固井存在的问题有水泥浆析水量大，驱替钻井液效果不佳，环空水泥浆倒流等。