METHOD OF SELECTION OF ACID COMPOSITION FOR INTENSIFICATION OF OIL PRODUCTION Russian patent published in 2018 - IPC G01N21/31 E21B43/27 C09K8/72 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil and gas industry and relates to the method of selection of acid composition. Method comprises oil sampling before treatment of the bottomhole zone by acid composition, sample preparation based on oil dehydration by centrifugation, and preparing a solution of the starting oil in toluene. Further, the acidic composition of a certain concentration is prepared on the basis of the initial oil and preparation of the solution in toluene in the same proportions is already based on it. After this, data are obtained on the dependence of the optical density of the oil and acid emulsion under study on the wavelength of the radiation and the coefficient of light absorption (K_la). Graphs of the K_la investigated oil and acid emulsion from the wavelength of radiation. Next, the obtained values of the light absorption coefficients with K_la of the control sample, and an acidic composition is selected in which the change in K_la between the control and test samples is minimal.

EFFECT: technical result consists in increasing the accuracy of selection of acid formulations, increase efficiency of acid treatment and prevent the possibility of plugging the pores of the bottomhole formation zone with asphaltenes precipitated and formation of poorly filtered emulsions in the oil saturated bed.

1 cl, 2 dwg