大庆杏北油田油气集输流程改造初期所用的Dg1200三相计量分离器(79—Ⅱ型,见图1),对含水在60％以内、日产液量60吨的油井,(油气)计量准确,操作方便。随着油田开发时间的增长,油井含水率逐步上升(因采取注水开发方式),产液量大幅度增加。例如,古北三中转站的一号计量站所管辖的8口油井,其中7口下电泵采油,平均 The Dg1200 three-phase metering separator (type 79-Ⅱ, see Figure 1) used in the early stage of the reform of the process of gathering and transportation of oil and gas in Daqing Xingbei Oilfield is accurate for oil wells with a water content within 60% and a daily output of 60 tons. Easy to operate. With the development time of the oil field increasing, the water cut of the oil well gradually increases (due to adopting the water injection development method), the liquid production volume increases greatly. For example, Gubei three transit station No. 1 metering station under the jurisdiction of the eight wells, of which seven under the pump pumping, the average