公开(公告)号：US4503752A

公开(公告)日：1985-03-12

申请号：US480075

申请日：1983-03-29

申请人： Samson A. Olson ,  George C. Williams

发明人： Samson A. Olson ,  George C. Williams

IPC分类号： E21B43/12 ,  F15B13/02 ,  F01L15/02

CPC分类号： E21B43/127

摘要： A hydraulic pumping unit is provided that is especially adapted for use for pumping oil from a well, and that provides for independent upstroke and downstroke speed control of the well sucker rod. The pumping unit includes a load sensing, pressure and flow compensated pump that is destroked under no load conditions, a pumping cylinder including a polished rod coupled to the sucker rod, and a unique hydraulic valving assembly that couples the hydraulic fluid pump with the pumping cylinder. The hydraulic valving assembly includes a cylinder control module for independent control of the rates at which the polished rod is raised and lowered, and a signal control module for indicating the upper and lower limits of polished rod travel within the pumping cylinder. The cylinder control module provides for soft turnaround of the polished rod, thereby guarding against stretching of the sucker rod and subsequent degradation of the unit's pumping capacity.

摘要翻译： 提供了一种特别适合用于从井中抽油的液压泵送单元，其提供了抽油杆的独立上行程和下行程速度控制。 泵送单元包括负载感测，压力和流量补偿泵，其在无负载条件下被破坏，包括耦合到抽油杆的抛光杆的泵送缸和独特的液压阀组件，其将液压泵与泵缸 。 液压阀门组件包括用于独立控制抛光杆升高和降低的速率的气缸控制模块，以及用于指示泵送气缸内的抛光杆行程的上限和下限的信号控制模块。 气缸控制模块提供抛光杆的柔软周转，从而防止抽油杆的拉伸并随后降低单元的泵送能力。