DEVELOPMENT OF TECHNOLOGY FOR CLEANING THE BOTTOM-HOLE ZONE OF THE FORMATION FROM ASPHALT-RESINOUS DEPOSITS

Abstract

The article considered the process of operation of wells, paraffin oil, causing a serious problem during the operation of the well. Physico-chemical methods providing an increase in displacement and coverage coefficients simultaneously for the extraction of film and capillary–retained oil from flooded reservoirs. At the same time, by adding special chemicals to water, it is possible to create solutions that reduce: the interfacial surface tension of water, thereby changing the ratio of the displacing and displaced phase mobility. For this kind of issues, pilot field studies and testing of the optimal technology for cleaning the bottom-hole formation zone (BFZ) from deposits of asphaltene-resinous substances were carried out and 6 production wells were selected for this purpose. Further, the criteria of wells for conducting pilot field tests of the technology for cleaning bottom-hole zones of wells from asphaltene-resinous substances are recommended. A composite composition with a high solvent capacity in relation to asphaltene-resinous substances was selected, the results of laboratory studies to determine the effectiveness of hydrocarbon solvents were given. The volume of the solvent composition was calculated for all selected wells. It is recommended that for processing for each well, a "Plan for processing the bottom-hole zone of the well" was drawn up, and a recommendation was also given that the processing of the BFZ should be carried out without extracting the underground equipment of the well (tubing columns with a pump).