Abstract: An apparatus for recovering liquids from a wellbore includes a primary pump for pumping a primary fluid through a primary fluid conduit positioned in the wellbore, and a secondary, displacement-type pump. The displacement pump includes a recovery section and a drive section, the volume of the recovery section being adapted to vary in inverse proportion with the volume of the drive section. The secondary or displacement pump also includes an inlet arrangement with a suitable one-way valve for allowing wellbore liquid to flow into the recovery section, and an outlet arrangement adapted to carry liquid expelled from the recovery section to the surface. A venturi body is connected in the primary fluid conduit and is adapted to produce a reduced pressure at a venturi outlet as the primary pump pumps the primary fluid through the conduit and venturi body at a first flow rate and with a first pressure differential across the venturi body.