The spatial structure of Uroglena americana was detected using an autonomous underwater vehicle equipped with a submersible microscope, video recording system and water quality monitoring sensors. Uroglena americana colonies were enumerated via image analysis and pattern recognition methods. This quantitative technique is useful for understanding plankton assemblages, distributions and their po...

Electrical submersible pumps (ESPs) face enormous challenges in the petroleum industry while handling gas–liquid two-phase flow. The major difficulty is caused by accumulation of gas bubbles inside ESP-impellers, which results mild to severe degradation pump performance. Therefore, analyze influence entrainment and bubble size, a combination experimental numerical analysis performed on five-sta...

Abstract This study introduces a comprehensive and cost-effective approach to diagnose treat the asphaltenes precipitation problems in different downhole conditions. The proposed has been successfully applied two oil wells (Well-I, Well-II) located Western Desert of Egypt. produce moderate high gravity with low content using Electrical Submersible Pumps (ESP). In such operating conditions, soli...

The working capability of multi-stage pumps, such as electrical submersible pumps (ESPs) handling multiphase flow, has always been a big challenge for petroleum industries. major problem is associated with the agglomeration gas bubbles inside ESP-impellers, causing pump performance degradation ranging from mild to severe deterioration (surging/gas pockets). Previous literature showed that two-p...

Link for citation: Glazyrin A.S., Isaev Yu.N., Kopyrin V.A., Timoshkin V.V., Kladiev S.N., Khamitov R.N., Kovalev V.Z., Losev A.F., Leonov A.P., Popov E.I. Transient processes in electrical complex of production well with downhole compensator reactive power. Bulletin the Tomsk Polytechnic University. Geo Аssets Engineering, 2023, vol. 334, no. 5, рр.168-180. In Rus. The relevance. At present ti...

the present study was undertaken to compare the in hospital results of coronary artery bypass graft (cabg) with (on pump) or without (off pump) cardiopulmonary bypass (cpb). data were collected on all first-time isolated cabgs with saphenous vein and/or artery grafts at shahid madani hospital in tabriz-iran, between 2006 and 2009. age and clinical profile were marched between on pump and off pu...