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美国Watson国际油田营业公司在油田上引进一种两级杆式抽油泵(见附图),经试验表明,产油量增加5～500％,普遍为25～300％。 这种泵有一个能与杜塞拉杆作相对运动的游动柱塞和三个“标枪”型凡尔。顶部浮动凡尔和底部固定凡尔靠压差推动,中间游动凡尔则通过与凡尔连接的柱塞拉杆作往复运动而机械启闭。柱塞将泵简分成两个液腔,它由抽油杆柱带动,但柱塞开始向下或向上运动时,游动凡尔就已提前开启或关闭。
Watson International Oilfields USA introduced a two-stage rod pump on the field (see photo). Experiments show that oil production is increased by 5 to 500% and generally from 25 to 300%. The pump has a swimming plunger that moves relative to the Dousse rod and three “javelin” -type Vallees. Floating at the top Floating at the bottom and fixing at the bottom Verstel driven by a pressure differential with a middle move Versail opens and closes mechanically by reciprocating the plunger rod connected to Versail. Plunger The pump is simply divided into two liquid chambers, which are driven by the sucker rod, but when the plunger starts to move downward or upward, the swimmer moves on or off in advance.