DOWNHOLE ROD PUMPING UNIT FOR OIL PRODUCTION UNDER CONDITIONS COMPLICATED BY SCALE IN DOWNHOLE PUMPING EQUIPMENT AND HIGH CORROSIVENESS OF PRODUCED PRODUCTS Russian patent published in 2022 - IPC E21B43/00 

FIELD: oil industry.

SUBSTANCE: invention relates to the oil industry and is intended for the extraction of oil from wells complicated by scaling in downhole pumping equipment and high corrosiveness of the produced products due to the content of hydrogen sulfide with a large flow rate of more than 20 m³/day, when using different types of sucker-rod pump. A downhole rod pumping unit for oil production under conditions complicated by scaling in the downhole pumping equipment and high corrosivity of the produced products, contains a sucker rod pump driven by a drive through a string of sucker rods, a string of production tubing, a liner and devices that provide creating resistance to fluid flow and pressure drop. Devices that provide resistance to fluid flow and pressure drop are made of hollow pipes 0.5 m long with an internal section in the form of a truncated cone. Hollow nozzles with a conical internal section are placed evenly between the liner pipes and are connected by coupling joints. In this case, the area of ​​the lower base of the truncated cone of the hollow pipes is equal to the area of ​​the inner section of the liner pipes. The area of ​​the upper base of the truncated cone of the lower branch pipe is equal to 20% of the area of ​​the internal section of the liner pipes, and the area of ​​the upper base of the truncated cone of each subsequent branch pipe located above is less than the previous one by at least 10%. In this case, the area of ​​the upper base of the upper branch pipe is at least 10% of the area of ​​the inner section of the liner pipes.

EFFECT: invention provides the necessary mode of selection and increases the reliability of the well.

1 cl, 1 dwg