| 摘要 |
An apparatus and method for pumping fluids, such as water and/or hydrocar bons, from a subterranean formation or reservoir, include a linear rod pump having a mechanical rack and pinion drive arrangement, adapted for attachmen t to a pumping mechanism, such as the polished rod at the top of a rod strin g in a hydrocarbon well. The rack gear, of the rack and pinion drive arrange ment, is adapted for connection to, and movement with, the polished rod. The pinion gear does not translate with the rack gear, and is driven by a rever sible motor for affecting up and down reciprocating motion of the rack gear and pumping mechanism. Some forms of the invention include a compressible ga s counter-balance arrangement. Some forms of the invention include an electr onic drive configured for dealing with electric power generated by the motor during a portion of the pumping cycle. |
