SU757772A1 - Starting arrangement for immersible centrifugal elecric pump - Google Patents

Description

The invention relates to the field of pump engineering and can find application in the operation of submersible electric pumps in sand wells.

A starting device is known for a submersible centrifugal electropump pumping a liquid from a sanding well, comprising a housing with inlet and outlet nozzles and a spring-loaded port located therein.

Shen [1].

However, in the well-known pump, along with facilitating the start-up of the electric pump (since the start is carried out on the "closed valve"), when the piston 15 is fully raised, the pump runs at full capacity, which leads to a sharp decrease in the level of fluid in the casing well, which in turn causes sand emissions from the 20th reservoir into the casing, and pumping fluid with a high content of sand causes increased wear of the flow part of the pump.

The purpose of the invention is to increase the reliability of the electric pump by automatically changing its performance.

This goal is achieved by the fact that the piston and the housing is made of steps-30

They form an annular cavity, a nozzle is installed at the bottom of the piston, and conical locking elements interacting with the nozzle in the extreme positions of the piston are installed in the nozzles and the spring of the latter is placed in the annular cavity.

FIG. 1 shows the placement of an electric pump with a starting device in the well; in fig. 2 - design of the starting device. _about

Starting device 1 submersible centrifugal electric pump 2, failure. slugging fluid from the sanding well 3 comprises a housing 4 with an inlet 5 and an outlet 6 with nozzles and a piston 7 located therein, spring-loaded with a spring 8.

The piston 7 and the housing 4 are stepped and form an annular cavity 9 in which a spring 8 is installed. A fitting 11 is installed in the bottom 10 of the piston 7. A conical locking element 12 is installed in the inlet 5 and a conical locking element 13 in the output 6 .

The piston 7 is sealed in the housing 4 by means of seals 14, and the annular cavity 9 is connected to the atmosphere by means of an aperture 15.

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The device works as follows.

In the submersible pump 2, a check valve is installed (not shown in the drawing), due to which a liquid column remains in the pipe string after turning off the pump. This pillar and device 1 create a “closed gate” mode.

When starting an electric pump under the piston 7, an excessive pressure is created, which moves the piston 7 upwards, as a result of which fitting 11 opens. As the electric pump is turned on, the borehole has a static level, the performance of the electric pump 2 will be higher than estimated and the piston 7 will move up to the stop in the output pipe b.

In this case, the flow area of the fitting 11 will decrease.

If the flow of fluid from the reservoir into the well ensures the performance of the electric pump, then the piston will stop in any middle position. If the inflow is less, the piston 7 will fall and the fitting 11 will overlap element 12. This increases the hydraulic resistance, which will reduce the performance of the electric pump.

Thus, the correspondence of the performance of the electropump and the inflow of fluid to the reservoir is automatically established.

Claims (1)

Claim Starting device for a submersible centrifugal pump that pumps out liquid from a sanding well ¹⁰ , containing a housing with inlet and outlet nozzles and a spring-loaded piston located in it, characterized in that 15 electric pump by automatically changing its performance, the piston and the housing are stepped and form an annular cavity, a fitting is installed in the bottom of the piston, and 20 in the pipes - conical locking elements interacting with the fitting in the extreme positions of the piston, and the spring of the latter is placed in the annular cavity.