https://www.hartenergy.com/exclusives/artificial-lift-technology-showcase-tools-lift-production-rates-higher-181616

Rod pump increases downhole pump efficiency at any inclination
Customer partners of Endurance Lift Solutions are deploying the High Angle Rod Pump (HARP) to increase downhole pump efficiency at any inclination angle in deviated and horizontal wells, in addition to wells with damaged wellbore casing or liners. The HARP can be set at inclinations up to 90 degrees utilizing its articulating plunger and “positive seal” traveling and standing valves. The HARP operates in challenging fluid regimes, handling high volumes of entrained production gas without gas locking its positive seal valves. By utilizing its unique valves, customer partners are able to increase lifting efficiency, decrease beam unit strokes per minute, reduce downhole pump wear, lower electricity costs and increase gross daily production of fluid. The HARP is available in standard and premium metallurgies and may be landed at depths of up to 3,048 m (10,000 ft) dependent on oil gravity and water cut. endurancelift.com

The HARP features include articulating plunger and “positive seal” traveling and standing valves,
designed to enable customer partners to land in the horizontal and maximize pump efficiency while preventing gas locking. (Source: Endurance Lift Solutions)