LONG-STROKE DEEP-WELL PUMPING UNIT Russian patent published in 2002 - IPC

FIELD: mechanical engineering; equipment for lifting oil from wells; pumping-out formation waters; extraction of minerals from deep depth in liquid state. SUBSTANCE: pumping unit has foundation, reversible surface drive, drum mobile base-trolley, flexible tractive member, plunger connected with flexible tractive member, sealing device for flexible tractive member located at wellhead, upright with guide rollers fitted on said upright on opposite sides of flexible tractive member symmetrically relative to axis of well. Axes of guide rollers are parallel relative to each other and are perpendicular relative to direction of motion of mobile base-trolley. One guide roller is provided with beads and second guide roller is located between beads of first roller. Upright is rigidly secured on mobile base-trolley mounted on foundation for locking it above wellhead and outside it in preset position. Reversible surface drive and drum are immovably secured on foundation beyond explosive zone of well. EFFECT: improved and service characteristics; enhanced economical efficiency of oil production. 3 dwg