泵的轴封采用机械密封，泵体顶部和底部分别装有注水、放泄的螺塞。
Pump shaft seals use mechanical seal, pump top and bottom, respectively, equipped with water injection plug and the drain plug.
段塞的位置应能确保流体在油管柱从井筒中起出时从油管柱中自然地放泄。
A slug may be placed to ensure that fluids are naturally drained from a tubing string as it is pulled from the wellbore.
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