SDJ2 fluid loss additive for oil well cementing is synthesized from water-soluble modified natural polymer HEC with suitable average molecular weight, and the properties of the grout contained SDJ2 is tested in laboratory.

• 选用合适平均分子量的水溶性天然高分子改性产物羟乙基纤维素(HEC)合成一种油井水泥降失水剂SDJ2,并对添加SDJ2的水泥浆的性能进行了室内评价。