Development of a new technology for preventing asphalten-resin–paraffin deposits

This paper presents the results of the scientific research on the NDP-22M-1 composition, which has successfully passed laboratory tests aimed at preventing the deposition of heavy hydrocarbons in the production tubing of the wells with paraffinic oil and in other transportation pipelines. The main relevance of the paper is the method for preventing asphaltene -resin -paraffin deposits (ARPD) that occur during the operation of the wells with paraffinic oil. The deposition of heavy hydrocarbons in the production tubing and other transport pipelines generates a counter hydraulic resistance to the movement of the fluid (oil) from the reservoir to the surface and to the receiving station, ultimately leading to the formation of ARPD. NDP-22M-1 composition has been developed to deal with this. This technology can be applied in reservoirs containing asphaltenes, bitumen, paraffin, and other heavy hydrocarbons. By using the “cold fingers” method under laboratory conditions, it was determined that by adding 200 grams of the reagent per ton of produced oil, heavy hydrocarbon deposits can be reduced up to 72.5%. This reagent favorably affects the rheological properties of heavy hydrocarbon oils, ensuring the removal of ARPD from various parts of the system — from the filter portion within the well, via both surface and underground communications starting from the wellhead discharge lines up to the receiving station. As a result, the regular functioning of the well is restored and oil productivity of the reservoir increased. In its turn, this can extend the interval between well repairs by 2.5 times, which is highly advantageous from the economic point of view. Keywords: paraffin; asphaltene; resin; reagent; deposit; well bottom zone; porosity; depressurizer.