Patent ID: 9004165
Filing Date: 2015-04-14
Classification: E21B

Abstract:
1. A method for oil recovery with use of energy of elastic vibrations including placement of downhole apparatus in a well on working depth, which is connected to aboveground power supply units and contains an ultrasonic transducer that provides for the generation of high frequency elastic vibrations, exciting elastic vibrations of different frequencies and then repeatedly applying the elastic vibrations to the oil formation (pool), wherein impact on oil pool is done with both high and low frequency vibrations, wherein the low frequency vibrations are generated with the aid of an electric pulse device which is connected to an aboveground power supply and comprises the following electrically interconnected components: a charger, a unit of energy storage capacitors, a discharge unit with electrodes, and two switching means, one of which provides grouping of charging capacitors in one single unit and the second carries out switching of charging capacitors from one type of electrical connection to another, wherein impact with high frequency elastic vibrations is performed in low frequency ultrasonic range, and is continued in constant or pulse regime with intensity in the range of 1-5 Wt/sm 2 while impact with elastic vibrations of low frequency is performed with frequency of charges equal to 0.2-0.01 Hz and is continued with energy of single impact of discharge making 100-800 J, wherein the charger is supplied from power supply unit with DC voltage with magnitude in the range 300-150 V, before charging of capacitors they are grouped in one single unit, charging of unit of energy store capacitors is executed at least partially with parallel connection and is continued up to required magnitude of voltage, with maximum magnitude equal to 20-27 kV, and before discharging of unit of energy storage capacitors providing supply of output voltage on electrodes and of discharging unit, all charging capacitors or part of them are switched into series electrical connection, together with this impact with elastic vibrations of low and high frequency is performed, continued with constant or varying electrical and acoustical characteristics of aboveground or in-well equipment and technological parameters of oil recovery process.