We conducted field tests of coalescers installed in capacitive devices for oil dehydration and desalting of mobile unit for well production treatment. Until now no investigations to determine the optimal gap between the plates intensifying have been conducted. During tests the cassette were mounted in the sump of mobile unit with the distance between the plates of 5 mm (standard design) and 2.5 mm. Investigations carried out in different cases: incoming fluid in the horizontal sump (top and side), the process temperature (60 и 70 °С) and fresh water consumption (increased by 10, 20, 30% compared with the current industrial setting mode). The article shows that the smaller distance between the plates provides a turbulent diffusion in intensifying devices leading to a deeper degree of oil treatment. It is found that desalting processes proceed more intensive at temperature 70 °С than at 60 °C even when the supply of fresh water for 10 and 20%. The increase of fresh water consumption at 30% leads to an appreciable increase in the proportion of water in the drip oil prepared deteriorates desalting process, which affects the results of oil samples after preparation and confirmed weak effect of increasing supply of fresh water for the process. According to the research it was found that the use of intensifying devices the distance between the plates distance of 2.5 mm leads to an improvement of oil treatment degree: decrease of water content by 2–37 % and the content of chloride salts by 5–74 % depending on the process.
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