| 摘要 |
A load reduction device (10) for a deep well (1) pumping system, which is driven by a sucker rod string (6) with reciprocating motion and drives a subsurface pump (4); and a deep well (1) pumping system comprising said load reduction device (10). Where said load reduction device (10) has a reduction ratio which defines how much the loads acting on said sucker rod string (6) are reduced; and comprises a speed reducer (13) of which several preferred embodiments are described. |
