Advances in ultrasonic production units for enhanced oil recovery in China

Synergistic Mechanism of Ultrasonic-Chemical Effects on the CH4 Adsorption–Desorption and Physicochemical Properties of Jincheng Anthracite

“…Since the 1950s, ultrasonic technology has been widely used in oil extraction . According to experiments, the combined use of ultrasonic and chemical reagents restores 49% of the permeability in blocked cores .…”

In-depth analysis of ultrasonic-induced geological pore re-structures

“…From 1950 s till present, researchers have perceived that ultrasound can reduce crude oil viscosity, reduce oil–water interfacial tension, enhance capillary imbibition, and increase reservoir permeability after a large number of studies on the mechanism of ultrasonic enhanced oil recovery, they also believe that the power, frequency and handing time of ultrasound will affect the efficiency of ultrasound in enhancing oil recovery [22] , [23] , [24] , [25] , [26] , [27] , [28] . Ultrasonic oil recovery technology is widely used to be treated the blocking near well oil layers caused by deposition of particles in porous media, the purpose of increasing the crude oil production, water injection rate and oil recovery is achieved [29] , [30] . Daily production from wells in western Siberia increased by an average of 5.2 tons per day after ultrasonic stimulation of the near wellbore region [31] .…”

Study on frequency optimization and mechanism of ultrasonic waves assisting water flooding in low-permeability reservoirs

“…Recently, the ultrasonic wave has also been proved to change the relative permeability of oil in low-permeability reservoirs [30] , [31] , [16] , [32] , [33] , [34] , [35] . In addition, with high energies, the ultrasonic waves may also change the microstructure of cores [36] . Therefore, we would better conduct more analyses to set those issues straight and guide the optimization of ultrasonic frequency.…”