To raise the success rate of opening and closing the two-stagecementing tool, Model dsg-a cementing tool is developed.
为提高现有双级注水泥器打开和关闭的成功率，研制了DSG—A型系列双级注水泥器。
2
The paper gives an introduction to the structure , operating requirements and applications in olifields of Type SJG A double stagecementing implement.
介绍了SJG-A型双级注水泥器的结构特点、使用要求及现场应用情况。
3
The features of buried hill reservoir are described, and the use of two-stagecementing method, continuous open stage collar and cement basket is also presented.