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。
To raise the success rate of opening and closing the two-stage cementing tool, Model dsg-a cementing tool is developed.
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。
The paper gives an introduction to the structure , operating requirements and applications in olifields of Type SJG A double stage cementing implement.
胜利及青海油田近30口井应用表明，该双级注水泥器打开顺利、关闭可靠，能满足固井施工要求。
Application results in 30 wells of Shengli and Qinghai Oilfields show that the tool can be smoothly opened and reliably shut, meet the needs of cementing operations.
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