The general director of ZAO PARM-GINS S.G. Prosvirov is telling CTT correspondent about the method of hydraulic pulse stimulation and VJU - vibro-jet unit used to perform such stimulation: "Hydraulic pulse stimulation of the formation for optimizing performance of production and injection wells came into active in the early 1990's, when pressure pulse generators were designed and manufactured. Those pulse generators could produce pulses with sufficiently high energy characteristics. Speaking of high energy characteristics, I should specify that in this case it is about pressure pulses of dozens and hundreds of atmospheres (this unit of pressure is best perceived by our oil and gas industry workers). In addition, the pulse frequency must be within the range of 5 to 50 Hz (beats per second). This is due to the fact that permeable rock, with all the enormous variety of its fabric, has filter channels with rather small cross section (take cemented sandstone), and the shockwave created in the fluid, saturating pore channels of such rock, fades very quickly. Because of that and in order to make hydraulic pulse stimulation of such rock formations more efficient and to ensure that it would have a range big enough, it was necessary to create high-energy low-frequency pressure pulses."