DEVICE FOR TREATMENT OF CAVITY OF ANNULAR SPACE OF A CASING STRING Russian patent published in 2020 - IPC E21B37/00 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil and gas industry and can be used for cleaning wells. Device includes upper and lower housing. Upper housing is made with adapter adapter for connection by its upper part by means of external threaded connection with tubing string suspension, and internal threaded connection – with filter for cleaning of flow of working agent flowing along production string, and lower part upper housing is connected with upper internal threaded connection of lower housing device to form inner annular vortex working chamber. In the working chamber there is a hollow cylindrical central body with a conical fairing and holes in its side wall for provision of working medium flow from the vortex chamber to the lower end confuser hydrodynamic generator having an inlet cone hole, which is connected by threaded connection with cylindrical central body in its lower end part. Inlet taper hole of generator smoothly changes into critical hole, changing into exhaust channel for outlet of working fluid into processed cavity of annular space of casing string. Annular units with generators of hydrodynamic pulses in form of diffusers are installed in outer closed wall of lower housing with tiers at acute angle to vertical axis of device with confuser sections with inlet channels to allow flow of working agent from vortex chamber, changing into exhaust channels for outlet of working agent into processed cavity of annular space of casing string.

EFFECT: increased efficiency of device operation by generation of powerful high-frequency hydraulic impacts and increased amplitudes of shock wave and reduced time of treatment of annular space of the casing string.

4 cl, 6 dwg