Elastic vibrations can increase the effectiveness of oil extraction. The most successful results for oil extraction can be achieved by a combination of the elastic-wave action with other methods of enhanced oil recovery. The authors describe field tests of the use of elastic-wave action on an oil recovery process with in situ combustion. The experiment was performed for over five years in various plots of the Mordovo-Karmalskoye oil field. As a result of this combination, oil production was increased, water cut recoverable products were decreased, and unit costs were decreased. Physical mechanisms are proposed to explain this phenomenon.

An experimental study of the generation of pressure fluctuations in a well acoustic emitter with nozzles of various shapes has been carried out. The effect of a smooth nozzle inlet section on the...

We have carried out an experimental study on the generation of pressure oscillations in a model of a borehole ring acoustic radiator that moved within a cylindrical chamber. The possibility of...

The present paper elaborates on the experimental study of jet-excited pressure fluctuations in a Helmholtz oscillator model with two openings in a cylindrical cavity. The length of the cylindrical nozzle in the front cover ℓ_N normalized by the nozzle diameter d_N was ℓ_N/d_N = 0.125, 0.33, 0.47, and 0.67. The diameter of the outlet opening in the back cover d_OUT was in the range d_OUT/d_N = 1–2.5. The length of the cylindrical cavity L_CH determined the jet length L_JET in the spacing between the covers, L_CH/d_N = 0.5–3.5. The amplitude–frequency spectra were studied when the oscillator configuration was changed in the indicated intervals. From the generation amplitude, the best ratio of the sizes of the nozzle, chamber, and outlet was determined. The appearance of the jet tone of the hole and the alternation of acoustic modes were observed with a smooth increase in the Reynolds number to ∼8 · 10⁴. The measurements showed very high amplitude of pressure fluctuations in an oscillator with a short nozzle and a short chamber at a significant jet velocity. A slight increase in the length of the chamber led to a rapid decrease in the generation amplitude. It is determined that the tone frequency is usually much lower than the resonance frequency in the chamber. Moreover, the tone frequency gradually increases with increasing jet velocity, while the resonance frequency remains unchanged, close to the natural frequency of the cavity chamber.

The article presents the results of experimental studies of the process of thermochemical conversion of sunflower husk by pyrolysis at a temperature of 550 °C and heating rate of 10 °C/min. The main physico-chemical characteristics of this plant raw material correspond to commercial fuels. Ashes are dominated by potassium (38.7%), calcium (26.9%) and iron (13.6%) oxides. Thermochemical conversion of sunflower husks produces 56.49% of pyrolysis liquid, 29.26% of carbonaceous residue and 14.25% of gas. Experimental data of pyrolysis fluid viscosity dependence on temperature in the range from –6 to +23.5 °С were obtained. As a result of GC-MS analysis mass spectra of 90 substances of organic nature were obtained, of which 20 were identified, which corresponds to 77.3% of the entire fraction. Pyrolysis fluid contains acids, alcohols, esters, ketones, amides, aldehydes, alkenes, phenols. Taking into account boiling points of the components included in the liquid fraction, it was found that it is reasonable to extract acetic acid and methyl alcohol. The acetic acid content in the pyrolysis liquid under study reaches 31.98% and the methanol content 12.05%. It should be noted that the content of propanoic acid, 2-oxo-, ethyl ester (6.20%) is high enough, but its boiling point coincides with a number of other components, so distillation of this component is inexpedient. Thus, the obtained pyrolysis liquid is a source of raw materials for obtaining at least two high added value products.