Methodology Of Operation Of Ultrasound Assisted EOR

The geo-acoustic complex (technique) for the intensification of oil recovery consists of the powerful ultrasonic generator and ultrasonic transducer, powered through a standard 3 core logging cable. The whole equipment, realizing the acoustic stimulation technology, is in coordination with the regular equipments of geophysical parties which does not cause any difficulty in its adaptation by the regular geophysical personnel. The acoustic stimulation technology consists in the processing of collector layers (in the open bore, filter interval or perforated holes) by powerful ultrasonic field aimed at the restoration of their filtering properties. Processing is carried out point wise (with 0.5-1.0 interval) selectively based on the inflow stimulation profile principle. Well and equipment preparation is practically the same as that for standard geophysical researches. The integrity of the operational column and cement stone over it is ensured and the process of stimulation is technically and physiologically safe and environmentally sound.

Today, on an average, about 30-35% of an oilfield is brought to the surface. This leaves a big potential for technologies which enhances oil recovery. Right now the methods available are based on steam, gas-injections and chemicals as discussed earlier. We claim that today acoustic well stimulation (ultrasound stimulation) is a modern, hi-tech, reagent free, geophysical method of controlled and selective stimulation of wellbore zone aimed at the intensification of oil recovery. Because of its versatility, it can be used under different geological and technological conditions. The results have sustained over the long span of time (up to 2 years and more). At the same time the technology is non- destructive and harmless from the perspective of the formation of well thus scoring over other known intensification methods of oil recovery increase.