| 摘要 |
A downhole pump system allows fluid to be pumped from a well to the surface through a production tubing string, while also allowing the downhole pump 10 to be retrieved to the surface while the production tubing string remains in the well. The downhole pump may include a hold down housing 12, a mandrel 14 , a drive coupling 18, and a lifting nut 20. The pump is driven by a drive rod , which conventionally extends from the surface to the downhole pump. Axial movement of pump components may be prevented by a spring lock mechanism 24, while torque transmitting surfaces 26 prevent rotation of the pump housing 12 with respec t to a landing nipple 25.
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