| 摘要 |
A rod-driven, downhole pump (10) is disclosed, the pump including a traveling barrel (16) contained within a pump housing (14), a central pump rod (22) extending axially within the barrel, a valve ball (24) located at the lower end of the pump rod, a valve seat (26) near the barrel lower end, the pump rod including a rod shoulder (62) for engaging the upper end of the barrel, the barrel containing annular passageways for the flow of fluid through the barrel, the pump rod reciprocable within the barrel, and the barrel reciprocable within the pump housing. The downward stroke of the pump rod causes the rod shoulder to engage the barrel upper end and concurrently displaces the valve ball below the valve seat, thereby allowing environmental fluid to flow through the barrel annular passageways. On the up stroke of the pump stroke of the pump rod, the valve ball engages the valve seat and pushes the pump barrel upward within the pump housing. The sealing of the valve ball on the valve seat and the upward movement of the barrel displace columnar fluid upwardly.
|
