METHOD OF DISLODGEMENT OF ELECTRICAL CENTRIFUGAL PUMP UNITS Russian patent published in 2017 - IPC E21B37/00 E21B43/00 

FIELD: petroleum industry.

SUBSTANCE: invention refers to the petroleum industry and, particularly, to operation of wells equipped with electrical centrifugal pump units. According to the method via pumping and compression pipes (PCP), the hydrodynamic generator is descended on a flexible pipe or on PCP of the less diameter to the level of a pump for generating of pressure fluctuations of the operation fluid before, during, and after the commissioning of the submerged electrical motor. The frequency of the pressure fluctuations of the operation fluid is provided so that it matches the frequency of impact and vibration movements of the submerged electrical motor rotor and emerging of the resonance effect. Frequencies and magnitudes of resonance impact are selected according to the condition of prevention of damaging of operating parts of electrical centrifugal pump and provision of intensive mechanical destruction of the solid phase of deposits of the said lodged pump with the increasing of the degree of dispersion of this phase. During the impact on the lodged pump by the pressure pulsation generated by the hydrodynamic generator, the intensive washing of the electrical centrifugal pump with the operation fluid in pulsation mode with the set consumption is performed.

EFFECT: increasing of efficiency of dislodgement and treatment of the electrical centrifugal pump unit from mechanical impurity and salt deposits formed during the process of formation fluid drainage and, as a consequence, the increasing of interrepair period of operation of pump units of this time.

1 dwg