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分级注水泥工艺技术可以降低环空静液柱压力，减少漏失，阻止高压油气窜；可选择性封固地层，节省水泥，提高固并质量。但随着钻井深度的不断增加，分级注水泥器的下入深度及下挂管串长度也越来越长，对分级注水泥器在高温、高压下的性能要求也随之提高。针对过去YFZ－B型系列
Graded injection cementing technology can reduce the pressure of annular hydrostatic column to reduce leakage and prevent high-pressure oil and gas channeling; can selectively seal the formation, save cement and improve the quality of consolidation. However, with the continuous increase of drilling depth, the depth of the grouting device and the length of the hanging pipe string become longer and longer, and the performance requirements of the grouting device under high temperature and high pressure also increase. For the past YFZ-B series