METHOD OF CONTROLLING FORMATION OF ASPHALTENE SEDIMENTS DURING PRODUCTION OF HIGH POUR POINT ANOMALOUS OIL Russian patent published in 2022 - IPC E21B37/06 

FIELD: oil industry.

SUBSTANCE: invention relates to the oil industry. Method of controlling asphaltene sediments (AS) during production of high pour point anomalous oil involves pumping a solvent into a tubing string, filling the tubing string and directing the solvent through the bypass valve for accumulation above the borehole pump, using a frequency current converter, smoothly increasing the current frequency of the submersible electric motor of the installation, start-up of electric submersible pump (ESP) with capacity providing transportation of solvent from annular space from top to bottom into cavity of electric submersible pump through its inlet holes. For complete removal of AS it is necessary to repeat this procedure of solvent supply to the pump several times. At that, preliminary determination of weight ratio of high pour point anomalous oil and oil with lower weight content of paraffin is carried out, at which maximum reduction of AS formation depth and intensity in flow column is provided at production of high pour point anomalous oil from multilayer deposit. Highest efficiency is obtained by mass ratio of high pour point anomalous oil and oil with lower weight content of paraffin of 10:90, respectively. Downhole equipment layout is selected for simultaneous-separate operation of several productive formations and ESP shaft rotation frequency based on quantitative assessment of AS formation depth variation in the well during production of high pour point anomalous oil depending on ESP shaft rotation frequency. Greatest reduction of the AS formation depth in the well is achieved at the ESP shaft rotation frequency equal to 54 Hz. Data on change of well flow rate and thickness of deposits in flow column depending on time is collected. Intertreatment period of well operation is determined by the point of intersection on the diagram of dependencies of change of well flow rate and thickness of deposits on time.

EFFECT: improving operating efficiency of wells, complicated by intensive formation of AS, at oil production by ESP from multi-formation deposits.

1 cl, 11 dwg, 4 tbl