CASING BOTTOM DEVICE Russian patent published in 2023 - IPC E21B7/20 E21B17/14 E21B37/00 

FIELD: oil and gas production.

SUBSTANCE: construction of oil and gas wells with horizontal sections, in particular equipment for equipping the lower part of the casing. The casing bottom device includes a hollow cylindrical body with a connecting thread in the upper part for connection with the casing string and a connecting thread in the lower part for connection with the conical guide nozzle. In the lower part of the conical guide nozzle there are four through triangular slots, the total area of which is at least 90% of the entire area of the lower part of the conical guide nozzle, equipped with strips converging in the center of the conical guide nozzle. In this case, a sludge accumulator is installed above the conical guide nozzle inside the cylindrical body with longitudinal slots with a length of at least 100 mm located over the entire area of the accumulator and protrusions in the lower part of the accumulator. A check valve is installed above the cylindrical body.

EFFECT: improving the reliability of running and installing the casing in a horizontal wellbore complicated by debris and reducing labor costs.

2 cl, 2 dwg