WELL DECOLMATATION DEVICE Russian patent published in 2018 - IPC E21B37/00 E21B21/00 

FIELD: mining.

SUBSTANCE: invention is intended for cleaning and flushing a wellbore. Device for decolmatation of wells consists of a body with a cylindrical axial channel, an adapter for communication with a flexible pipe, a cup, a drainage tube with radial holes, an adapter and a ring ledge, a spring, a lock nut, a drive mechanism with tangential channels. Adapter is equipped with a solid bottom with a conical protrusion extending into the cylindrical axial channel of the body. Hollow nozzle with an annular projection and a thrust bushing is placed in a conical axial channel. Upper end of the hollow nozzle is located freely between the inner wall of the cylindrical axial channel of the body and the conical projection of the solid bottom. Lower end of the hollow nozzle is provided with a face valve with a spherical surface resting on the reciprocal spherical surface of the bearing seat installed in the bore of the tapered channel of the body and is connected to the feed tube. Feed tube is connected to the sleeve with an inner annular bore embracing the cup with the nut. Nut is mounted with the possibility of an end contact with the annular projection of the drainage tube and the formation of a movable connection with the drainage tube. Annular projection of the drainage tube is provided with a sealing ring and forms a movable connection with the cup. Tangential channels are made in the adapter over the solid bottom. Radial holes of the drainage tube are located under the nut. Axial channel of the cup between the nut and the annular projection of the drainage tube is connected by holes with an inner annular bore of the sleeve connected by a bypass port with an axial channel of the feed tube.

EFFECT: proposed invention makes it possible to increase the efficiency of flushing and cleaning of wells, contributes to the restoration of permeability in the perforation interval.

1 cl, 4 dwg