THE USE OF INTERNALMULTIFUNCTIONAL COATINGS FOR PUMP AND COMPRESSOR PIPES TO PROTECT AGAINST THE FORMATION OF ASPHALT, RESIN AND PARAFFIN DEPOSITS

Abstract

Along with the corrosive effect on downhole equipment, including pumping and compressor pipes (tubing), one of the main complicating factors in oil production is the formation of asphalt-resin-paraffin deposits (ARPDs) on the inner surface of the tubing. As in the case of corrosion protection, among the various methods of preventing the formation of ARPDs, the use of appropriate protective coatings has the greatest potential and is a valuable method because of its simplicity, efficiency and durability. At the same time, the use of manufactured anticorrosive coatings, that is, in essence, multifunctional protective coatings, is especially attractive for protection against ARPDs. But for this it is necessary to know the ability of existing multifunctional coatings to prevent the formation of ARPDs, to be able to correctly determine this ability. This article presents the results of research on the influence of the properties of the internal multifunctional coatings of tubing on the formation of ARPDs from the oil environment. At the same time, both the previously obtained results on the influence of coating properties determined in static conditions of absence or stationary oil medium (roughness, adhesion of paraffin to dry coating, edge angles of wetting with distilled water in air and oil in an aqueous medium) and new results on the study of the effectiveness of the use of internal functional coatings to protect tubing from formation of ARPDs in dynamic conditions of a moving oil medium (influence of the temperature gradient, the flow rate and duration of the coating in the oil environment) using laboratory circulation stands developed with the participation of the authors of the article, which allow modeling the processes of ASF deposition on the inner surface of the tubing in conditions closest to borehole conditions, are considered. Three commercially available internal coatings on tubing for corrosion protection and ARPDs are considered: a silicate-enamel coating of the MK-5 brand and filled polymer coatings of the MPLAG 17 and GIOTEK 110 M brands based on epoxyphenolic polymers. It is shown that testing on the developed laboratory circulation stands allows the most reliable assessment of the ability of internal multifunctional coatings to protect tubing from the formation of ARPDs in borehole conditions.