DOI: https://doi.org/10.36719/2789-6919/46/146-152
Javad Aliyev
Azerbaijan State Oil and Industry University
PhD student
https://orcid.org/0009-0006-8505-9256
aliyev.javad@outlook.com
Application of Chemical Methods in the Prevention of ATPS in Oilfield Equipment and Evaluation of Their Effectiveness
Abstract
The presented article is devoted to the results of scientific research on the KTD-1 reagent, which successfully passed laboratory tests to prevent the deposition of heavy hydrocarbons in the risers of paraffin oil wells and other transport lines. The main relevance of the article is the technological method of combating asphaltene-paraffin deposits (ATPS) formed during the operation of paraffin oil wells.
The main relevance of the article is the technological method of combating asphaltene-paraffin deposits (ATPS) formed during the operation of paraffin oil wells. The main factor in the separation of paraffin deposits from oil is temperature. The crystallization temperature of paraffin deposits varies between 45-55 °C, depending on the composition of the oil. The precipitation of heavy hydrocarbons in risers and other transport lines creates a reverse hydraulic resistance to the movement of liquid (oil) from the formation to the surface and from there to the receiving point. This results in the precipitation of ATPS. For this purpose, the KTD-1 reagent has been developed. This technology can be applied in asphaltene, tar, paraffin and other heavy hydrocarbon deposits. It was determined in laboratory conditions by the “cold fingers” method that when added at the rate of 200 grams per ton of extracted oil, it is possible to reduce heavy hydrocarbon sediments by up to 72.5%. This reagent has a positive effect on the rheological properties of heavy hydrocarbon oils, ensuring the elimination of ATPS deposited in the filter section of the well, at different depths of the risers, as well as in surface and underground communications starting from the wellhead discharge lines to the oil reception point. As a result, the rhythmic operation of the well is restored, and the oil yield of the formation increases. This, in turn, can increase the repair interval in wells by 2.5 times, which is very economically advantageous.
Keywords: paraffin, asphaltene, tar, reagent, sediment, bottomhole zone, viscosity, depressant