WELL BOTTOMHOLE TREATMENT DEVICE Russian patent published in 2021 - IPC E21B37/06 E21B36/00 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the oil and gas industry. The device for treating the bottomhole zone of an oil well for cleaning from contaminants, including asphalt-resin-paraffin deposits, contains surface and underground parts connected by an injection pipe. The ground section is equipped with a compressor, a valve on the ground section of the device, and a bleed valve. The underground part is a cylindrical tank located in the wellbore at the level of the productive formation, made of a strong, refractory metal or alloy, having through holes on the side surface in its upper part, closed with a rubber membrane, equipped with a valve for the underground part of the device. The inner space of the underground tank is divided into two sections by a horizontal semi-permeable ceramic membrane. The lower compartment is filled with crushed calcium carbide. The upper one is intended for filling with a gas mixture of acetylene formed in the lower compartment as a result of the reaction of interaction of calcium carbide with water supplied to the lower compartment through the discharge pipe and supplied through a horizontal semipermeable ceramic membrane to the upper compartment, and oxygen supplied to the upper compartment of the chamber with using the compressor of the ground part of the device through the discharge pipe at the end of this reaction. The upper section of the underground tank is equipped with a gas analyzer sensor and a spark plug, which is triggered automatically when the amount of acetylene required for processing is reached in the upper section of the underground tank.

EFFECT: increasing efficiency of cleaning the bottomhole zone from contamination by initiating a directional explosion by passing a spark from a spark plug in a closed space of a disposable device, which, together with by-products of the reaction of obtaining acetylene, must be raised to the surface and further utilized.

1 cl, 2 dwg