DEVICE TO PREPARE FOAMED ACID Russian patent published in 2015 - IPC B01F13/00 B01F3/04 

FIELD: oil and gas industry.

SUBSTANCE: device to prepare foamed acid comprises a reservoir with a nozzle of liquid supply with a foaming agent, a nozzle of gas supply, a nozzle of stabiliser supply and a nozzle of foam discharge. The reservoir is made in the form of a pipe, where a hollow nozzle is installed concentrically, besides, the hollow nozzle at one side is rigidly connected to the pipe, and at the other side the hollow nozzle is tightly placed in the pipe. At the same time the inner diameter of the pipe is twice more than the outer diameter of the hollow nozzle. In the hollow nozzle there are holes with diameter of 1.8 mm, arranged in staggered order at the distance of 10 mm from each other, and at the external surface of the hollow nozzle in the interval of its holes along the helical surface there is a membrane, and centralizers are installed. The nozzle of liquid supply is installed into the pipe to holes of the hollow nozzle, and the nozzle of gas supply is installed from one end of the hollow nozzle, the nozzle of foam discharge is installed at the other end of the hollow nozzle. The nozzle for stabiliser supply is installed into the hollow nozzle at the side of the foam discharge nozzle at the distance of at least 1 m from the holes and is made in the form of a tube with a skew cut, with height equal to the inner diameter of the hollow nozzle, and aligned in direction of the foam flow.

EFFECT: increased quality and stability of produced foam.

1 dwg, 1 tbl