RU159811U1 - SUBMERSIBLE PUMP UNIT WITH INCREASED POWER FACTOR - Google Patents

Abstract

A submersible pump installation with an increased power factor, comprising a telemetry unit, a shank equipped with a packer, a tubing string with a drain valve, a check valve, a submersible centrifugal pump, a gas separator, a strainer, a hydraulic protection unit, a submersible motor and a power cable fixed to the tubing string using clamps, characterized in that the end Azhinov reactive power compensator mounted thereon sequentially telemetry unit and the shank equipped with a packer.

Description

The utility model relates to the oil industry and can be used to produce reservoir fluid. The power factor of the installations of electric centrifugal pumps, determined mainly by the cosφ of the submersible electric motor, is in the range of 0.7-0.85 at the rated load. Cosφ is also affected by the level of load on the SEM, the larger the underload, the lower the power factor and the greater the loss of active power during its transmission, with underload the cosφ can decrease to 0.6-0.75. To increase cosφ, it is necessary to compensate for the reactive component of the current.

A known installation of an electric centrifugal pump (ESP) for the production of formation fluid [RU 136502 U1 published January 10, 2014] containing wellhead equipment, a control panel, a power cable, a tubing string with a liner installed on the string in the well in series from above down submersible centrifugal pump with a receiving grid, a submersible electric motor (SEM) with hydraulic protection, characterized in that it is equipped with an additional centrifugal pump kinematically connected with the SEM, the wellhead equipment idnoy line is connected to the tubing, with the bottom of the SEM before the bottom seal section is mounted submersible telemetry unit connected with the latter and the shaft of the SEM in the same system.

The closest in technical essence is the "Submersible pump installation" [RU 132836 U1 published 09/27/2013], containing a submersible electric motor suspended on a tubing below the aquifer, a lower hydraulic protection, an input module, an inverted-type electric centrifugal pump, a submersible flow meter and a shank equipped with a packer above the oil reservoir, characterized in that the submersible motor is made two-sided and above it there is an upper hydraulic protection, an input module and an electric centrifugal pump wasps

The disadvantage of these installations is the lack in their design of a device for compensating reactive power inside the well. This leads to additional losses of active power in the cable that feeds the submersible motor.

The objective of the utility model is to create a submersible pump unit with a high power factor, the implementation of which achieves the technical result of increasing the power factor of the plant, thereby increasing energy efficiency by reducing the current flowing through the power cable of the SEM.

The specified technical result is achieved in that the submersible pump installation with a high power factor comprises a telemetry unit, a shank equipped with a packer, a tubing string, with a drain valve, a non-return valve, a submersible centrifugal pump, a gas separator, and a strainer installed sequentially from top to bottom , a hydraulic protection unit, a submersible electric motor and a power cable fixed to the tubing string using clamps, characterized in that a downhole reactive power compensator is rigidly connected to the electric motor, with a telemetry unit and a shank equipped with a packer installed sequentially on it.

In FIG. 1 - shows a schematic diagram of a submersible pump installation with a high power factor.

The submersible pump unit with an increased power factor is a linear design containing a suspension of the tubing string 1, an armored electric cable 2, cable clamps 3, a submersible centrifugal pump 4, a gas separator 5, a strainer 6, a drain valve 7, a check valve 8 , hydroprotection unit 9, submersible motor 10, compensator 11, downhole reactive power compensator 12, telemetry unit 13, liner 14, packer (seal) 15, located in the production casing of wells us (FIG. 1). The submersible centrifugal pump 4 is rigidly connected to the tubing string 1. To allow liquid to be drained from the tubing 1 before lifting the submersible centrifugal pump 4 from the well or to prevent fluid from draining when it stops, between the tubing string 1 and the submersible centrifugal pump 4 has a drain valve 7 and a check valve 8, respectively. When operating wells with a high gas content of pumped oil to reduce the harmful effect of free gas on the operation of a submersible centrifugal pump 4, a gas separator 5 is rigidly attached to it. A strainer 6 is attached to the gas separator 5. In wells where the inlet gas content is less than 30% (for example, in highly watered wells) the harmful effects of gas on the operation of a submersible centrifugal pump 4 is not observed and the gas separator 5 can be excluded. In this case, the strainer 6 is attached to the submersible centrifugal pump 4. To protect against penetration of the formation fluid into the cavity of the submersible electric motor 10, to compensate for the thermal expansion of the oil volume, to transmit torque to the shaft of the submersible centrifugal pump 4, a hydraulic protection unit 9 is attached to the strainer 6, to which a submersible motor 10 is rigidly connected. To compensate for the volume of oil inside the submersible motor 10 when the temperature regime changes, compensation is rigidly attached to it torus 11. The downhole reactive power compensator 12 is rigidly connected to the compensator 11. Electric energy is transmitted from the power source to the submersible motor 10 and the downhole reactive power compensator 12 using an armored electric cable 2, mounted on the tubing string 1 using clamps 3 ( Fig. 1). An armored electric cable 2 enters the downhole reactive power compensator 12 and leaves it into the submersible electric motor 10. To determine the temperature and pressure, the telemetry unit 13 is rigidly attached to the downhole compensator 12. A shank 14 equipped with a packer 15 is attached to the telemetry unit 13 (Fig. 1 )

Submersible pumping unit with a high power factor works as follows.

When applying voltage through the armored electric cable 2 to the submersible motor 10, it comes into rotation. The torque is transmitted via a shaft to the gas separator 5 and the submersible centrifugal pump 4. The gas separator 5 through the strainer 6 starts to draw in the liquid, separating the gas contained in it. Next, the fluid enters the submersible centrifugal pump 4 and is pushed to the surface through the tubing string 1. Pumping fluid only from the oil reservoir is carried out using a liner 14 equipped with a packer 15. When voltage is applied through the armored electric cable 2 to the downhole reactive power compensator 12, it begins to generate reactive power. The power factor is determined by the formula 1 [1]:

where S is the total power, VA; P - active power, W; Q _L - inductive power, var; Q _C - capacitive power, var.

Submersible motor 10 consumes active and inductive power. Downhole reactive power compensator 12 generates capacitive power. Since inductive and capacitive powers are in antiphase, they cancel each other out. Thus, the power factor increases, the current flowing through the armored electric cable 2 decreases. The temperature and pressure in the well are measured by the telemetry unit 13.

Claims (1)

A submersible pump installation with an increased power factor, comprising a telemetry unit, a shank equipped with a packer, a tubing string with a drain valve, a check valve, a submersible centrifugal pump, a gas separator, a strainer, a hydraulic protection unit, a submersible motor and a power cable fixed to the tubing string using clamps, characterized in that the end Azhinov reactive power compensator mounted thereon sequentially telemetry unit and the shank equipped with a packer.

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