COLUMN SHOE FOR HORIZONTAL SHAFTS Russian patent published in 2024 - IPC E21B17/14 

FIELD: oil and gas production.

SUBSTANCE: invention relates to the construction of oil and gas wells with horizontal sections, in particular equipment for equipping the lower part of the casing for its unhindered passage. A column shoe for horizontal shafts includes a body consisting of two parts - an upper cylindrical part and a lower part. The upper cylindrical part of the housing is made with a connecting thread in its upper part for connection with the casing, and in its lower part - with a metric connecting thread for connection with the lower part of the housing. In the upper cylindrical part of the body there is a central passage channel formed by the internal protrusion of the upper cylindrical part of the body, and a flushing sleeve made with a base and a protrusion is installed. The base of the flushing sleeve is configured to limit the stroke of the flushing sleeve by resting it on the internal protrusion of the central passage channel of the upper cylindrical part of the housing. The flushing sleeve is equipped with a central hole and at least four side oblique channels, the total cross-sectional area of which is greater than or equal to the cross-sectional area of the central hole of the flushing sleeve, and the outer diameter of the flushing sleeve protrusion is equal to the internal diameter of the central passage channel of the upper cylindrical part of the body. The flushing sleeve under the base is equipped with a spring, and in the lower part - a thread for connection with a blind cone tip.

EFFECT: increase in the reliability of running and installing the casing in a horizontal wellbore, including in the presence of cuttings residues forming dunes throughout the entire horizontal section.

2 cl, 3 dwg