METHOD OF SELECTING POTENTIALLY EFFICIENT REAGENTS FOR REMOVAL AND PREVENTION OF RESINOUS-PARAFFIN ACCUMULATIONS Russian patent published in 2002 - IPC

FIELD: oil producing industry, mainly, development of deposits of paraffin crude oils with use of chemical reagents for removal and prevention of resinous-paraffin accumulations. SUBSTANCE: method includes treatment of said oil and reagent with electromagnetic field; measurement of dielectric characteristics of crude oil within frequency range of 10⁷-10⁹ Hz under temperature and pressure of given deposit; determination of frequencies f_mo, f_mr, corresponding to maximum values of loss-angle tangent for oil and reagent, and frequencies f_1o, f_2o, f_1r, f_2r from the following expression where tgδ_o is loss-angle tangent for oil; tgδ_mo is maximum loss-angle tangent for oil; tgδ_r is loss-angle tangent for reagent; tgδ_mr is maximum loss-angle tangent for reagent; f_1o, f_2o are frequencies of electromagnetic field at which tgδ_o= 0,7tgδ_mo; f_1r, f_2r are frequencies of electromagnetic field at which tgδ_r= 0,7tgδ_mr. Then potentially efficient reagents are selected on the assumption that at least one of frequencies f_mr, f_1r and f_2r is found within interval f_2o-f_1o. Temperature range within which dielectric characteristics are measured, shall include temperature of beginning of paraffin crystallization in said oil and which is different for various oils. EFFECT: higher accuracy of selection of potentially efficient reagents for removal and prevention of resinous-paraffin accumulations at said oil field with due consideration of oil properties and oil pool physico-geological conditions. 3 dwg, 3 ex