Abstract: The device for the decolmatation of the critical area of exploitation and injection wells includes a generator of electromagnetic pulses of resonant frequency, which is equipped with a controller (not depicted), and a coaxial cable which connects the generator to a downhole instrument, in which at least two converters for converting electromagnetic energy into mechanical energy are arranged, the converters operating at different frequencies. Furthermore, the converters for converting electromagnetic energy into mechanical energy are arranged in the downhole instrument in series in order of decreasing resonant frequency, and the dimensions of each of the converters are determined by the magnitude of the resonant frequency, each of which differs from the previous one by an integer of octaves.

Abstract: A set of equipment for extracting highly viscous oil comprises a pump-compressor string with an oil-pump drive placed therewithin and an arrangement consisting of an oil pump, a perforated string section with a pump anchor, and a downhole tool, which is in the form of a cylindrical body, mounted consecutively on the mentioned string. A hermetic cavity and an annular chamber with radial channels are arranged consecutively in the mentioned body. A high-frequency elastic-oscillation source in the form of an ultrasonic converter is arranged in the hermetic cavity of the body. The hermetic cavity along the axis of the arrangement is provided with a tie bar having an internal through channel leading into the annular chamber. A distributing device in the form of a movable bushing is mounted on the external surface of the body. The downhole tool is connected by an electric cable to an above-ground electric power source.