The invention relates to the oil industry and can be used for increasing well productivity by increasing the oil flowrate, for a well workover and isolation of a water-encroached bench. The method utilizes proanthocyanidin, and an amino acid having a hydroxyl group or a dipeptide containing said amino acid. The switching device utilizes a plurality of switching cables to couple each radio port of the RRU to each of the antenna ports associated with the antenna. An outlet path is formed at another end of the control volume body to discharge the fluid from the control volume body therethrough.