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Oil well cement retarder is an additive that can extend time for thickening cement slurry, which can ensure the
safety of cement. At present, the oil well cement retarder is mainly composed of synthetic materials, which are mainly
divided into three major categories: compound polymer, AMPS polymer and non-AMPS. In this paper, the research status
of synthetic oil well cement retarder in recent years is reviewed, and its shortcomings and development trends are
analyzed. It is pointed out that the shortage of synthetic retarder mainly lies in problems, including large temperature
sensitivity, small temperature application range, abnormal thickening curve, great influence on high temperature
settlement stability and cement stone strength development. The development direction of oil well cement retarder is
mainly focused on developing intelligent retarder and degradable retarder to meet the cementing needs of oilfields and
ensure cementing effect increasing steadily.
Study on desulfurized gypsum used as cement retarder
