RU2093710C1 - Centrifugal modular submersible pump - Google Patents

Abstract

FIELD: mechanical engineering; recovery of oil, industrial and thermal waters. SUBSTANCE: in multistage pump from 10 to 20% of total number of stages installed at inlet are made with inlet and outlet parameters of working wheels and guide vane assemblies differing from those of other stages. Diameter of inlet of working wheel is increased 1.1-1.2 times and width of outlet from working wheels is increased 1.2-1.5 times. Diameter of outlet from guide vane assembly is increased 1.1-1.23 times and width of inlet into guide vane assembly, in 1.1-1.23 times. Diameter of diaphragm is reduced 0.7-0.9 times. EFFECT: enlarged operating capabilities. 4 dwg

Description

 The invention relates to petroleum engineering and can be used in submersible centrifugal borehole pumps for oil, industrial and thermal waters.

Known submersible centrifugal pump containing a suction device, one or more pump sections, a fishing head. The pump section of such a pump consists of a housing in which guide apparatuses and a shaft with impellers are installed [1] In low-rate pumps, with a capacity of 5 to 50 m ³ / day, in order to ensure rated performance, the passage channels of the impellers and guide vanes are narrow, no more than 2-4 mm wide. Such narrowed stage channels sharply reduce the suction capacity of the pump, become clogged by mechanical impurities, especially the first 10-20 stages, which cause a disruption of the pump flow, wear of gap seals, increased vibration and, as a result, failure of the pump.

 The technical problem posed in the present invention is to increase the suction capacity of a multi-stage submersible centrifugal pump of low productivity.

 This task is achieved due to the fact that at the pump inlet stages are installed that are designed for a capacity that exceeds the design for this pump. To do this, from 10 to 20% of the total number of stages of the pump, at the inlet of the pump, the parameters of the input and output of the impellers and guide vanes are different from the other stages, for example, the diameter of the entrance to the impeller is increased 1.1-1.2 times, the width the exit from the impeller is 1.2-1.5 times, the diameter of the exit from the guide vane is 1.1-1.23, and the width of the entrance to the guide vane is 1.1-1.2 times, while the diameter of the diaphragm is reduced by 0.7-0.9 times.

 In FIG. 1 shows a general view of the pump; FIG. 2 shows the working sections of the pump assembly; FIG. 3 the impeller, in FIG. 4 guiding apparatus.

 The pump comprises a suction device 1, pump sections 2, consisting of impellers 3 and guide vanes 4 with diaphragms 5, a shaft 6, a housing 7, a fishing head 8. The pump is mounted on tubing 9.

 Impellers 3 and guide vanes 4, designed for a given performance, have a certain shape of the flowing part and certain characteristic geometric dimensions.

For the impeller, this is D _{about the} diameter of the entrance to the impeller, d _{W the} diameter of the impeller bushing, D _{r the} diameter of the impeller, b _{r the} width of the impeller.

For a guiding apparatus, this is D _{about the} diameter of the exit from the guiding apparatus, d _{W the} diameter of the sleeve of the guiding apparatus, D _{d the} diameter of the diaphragm of the guiding apparatus, b _{c the} width of the entrance to the guiding apparatus, D _{VK the} maximum diameter of the flow cavity of the guiding apparatus.

It was experimentally established that the best suction capacity is achieved when 10-20% of the total number of pump stages installed at the inlet are made with different input and output parameters of the impellers and guide vanes and installed at the pump inlet. So, for each of 10-20% of the first impellers installed at the inlet, the diameter D _{of the} impeller inlet increases 1.1-1.2 times, the width b _{r of the} exit of the impeller 1.2-1.5 times the diameter D _{of the} exit guide vanes in 1,1-1,23 times the width b _of the entrance to the guide apparatus in 1,1-1,2 times. In this case, the diameter D _{d of the} diaphragm should be reduced by 0.7-0.9 times.

 The pump operates as follows.

 The pump descends to the desired depth in the well. The reservoir fluid passes through the suction device 1, enters the impellers 3 rotating on the shaft 6 and the stationary guide vanes 4, collectively called the pump stages, where the necessary energy is communicated to the fluid. Further, through the fishing head 8 and tubing 9, the formation fluid enters the surface.

Claims (1)

 A submersible centrifugal pump modular, consisting of pump stages, each of which has an impeller and a guide vane with a diaphragm installed at its inlet, characterized in that 10 20% of the total number of pump stages installed at the inlet are made with different from the rest the parameters of the input and output of the impellers and guide vanes, while the diameter of the entrance to the impeller is increased 1.1 1.2 times, the width of the exit from the impeller 1.2 1.2 times, the diameter of the exit from the guide apparatus 1.1 1.23 times the entrance width apravlyayuschy apparatus at 1.1 - 1.2 times, and the aperture diameter is reduced to 0.7 to 0.9 times.

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