RU19105U1 - SUBMERSIBLE CENTRIFUGAL PUMP FOR OIL PRODUCTION FROM WELLS - Google Patents

Abstract

Submersible centrifugal pump for oil production from wells

Used: in submersible centrifugal borehole pumps for oil, industrial and thermal waters.

The purpose of the utility model: improving the reliability and efficiency of centrifugal pumps for oil production from wells with high gas content, through the use of a dispersing device in front of the pump inlet.

The essence of the utility model: the dispersing device is designed as an independent unit, allowing you to quickly, depending on the gas content in the well, use the pump with or without a dispersing device.

The dispersion efficiency is increased due to the use of a screw wheel 9 at the inlet and a divider 13 at the output of the dispersing device 5, and the main process of dispersion, grinding of gas bubbles into a homogeneous suspension is carried out through the use of at least two stages consisting of a dissecting apparatus 10 with blades, installed in the housing of the dispersing device, and wheels 11 with blades mounted on the shaft of the dispersing device.

abstract

Description

1ROT Ш11Ш1

MPK7R04O13 / 10

Submersible centrifugal pump for oil extraction from

The utility model relates to the field of pump engineering and can be used to pump fluid from wells with high gas content.

Known submersible centrifugal pump 1, designed for oil production from wells, containing a dispersing device. The dispersing device, the drive of which is carried out from the pump shaft, is installed in the lower section of the pump and contains at least two working bodies with radial blades located along the axis of rotation of the pump shaft.

This design improves the structure of the gas-liquid mixture flow entering the pump impellers located immediately after the dispersing device.

The disadvantages of the known design include the fact that the impellers of the dispersing device, made with radial blades.

wells

located along the shaft axis and installed by the centrifugal impeller of the pump, create additional resistance to the flow of the gas-liquid mixture, reducing its energy supply. This leads to a decrease in pressure in front of the impellers and, as a consequence, an increase in the degassing of the liquid and the volume of gas bubbles, which in turn worsens the suction capacity of the impeller. In addition, with a relatively low gas content in the formation fluid, there is no need to use a pump with a dispersing device. Moreover, the use of a dispersing device in this case significantly reduces the efficiency a device that consumes energy without producing work to create the pressure of the pumped liquid, and also increases the labor costs in its manufacture. The implementation of the pump with a dispersing device located on its shaft, located in the lower section of the pump, from a technological point of view, narrows the scope of this pump, since it is practically impossible to remove the dispersing device directly from the well. In addition, in the known device there is no possibility of forced supply of the pumped liquid to the dispersing device, which increases the likelihood of blocking the impellers of the pump with gas plugs and leads to a failure of the pumped liquid pump.

Also known is a submersible centrifugal pump 2, designed for pumping multiphase mixtures, containing working stages of the pump and a rotary dispersing device, the drive of which is carried out from the pump shaft. In front of the dispersing device of the known pump, a centrifugal impeller is installed, the drive of which is also carried out from the pump shaft. In the known pump, the dispersing device and the centrifugal impeller can be disconnected from the shaft with increasing pressure at the outlet of the impeller.

The dispersing device of this pump provides more reliable operation of the pump than the dispersing device of the pump of the above, however, even when the dispersing device is disconnected from the pump shaft, it negatively affects the efficiency of the entire pump, since the impeller and the dispersing bodies themselves create resistance to fluid flow. In addition, in the known device, there is a high probability of blocking the impeller by a gas plug, which can lead to a breakdown in the fluid supply.

The technical result achieved when using this utility model consists in the possibility of completing the submersible pump with a dispersing device as an independent unit, which allows you to quickly, depending on the gas content in the well, remove the dispersing device directly on the spot. In addition, the utility model provides increased dispersion.

gas bubbles contained in the reservoir fluid, while the claimed device does not contain elements whose normal operation can be blocked if there are significant volumes of gas in the pumped fluid.

To achieve a technical result in a submersible centrifugal pump for oil production from wells, containing pump sections, in the lower part of which a dispersing device is installed on the shaft, which includes at least two working bodies located along the axis of rotation of the pump shaft, one of working bodies, made in the form of a wheel mounted on a shaft, and another, made in the form of a divider apparatus, is fixedly mounted relative to the housing; a dispersing device, made in the form of a section module, a screw wheel is installed on the shaft on the shaft of the dispersing device on the inlet side of the gas-liquid mixture flow, and a divider is mounted motionless on the outlet side of the gas-liquid mixture flow.

In the apparatus-divider and the wheel, the blades are installed at an angle of not more than 60 ° to the longitudinal axis of the dispersing device with the possibility of creating an axial component of the flow rate of the gas-liquid mixture directed along the axis to the outlet of the dispersing device.

an angle from 10 ° to 80 ° to the axis of the dispersant device, and the plane tangent to the profile of the blade at the exit of the divider is parallel to the axis of the dispersant device. The device-divider, wheel and divider are made with at least two blades.

The essence of the proposed technical solution is illustrated by the drawing, where:

in FIG. 1 shows a general view of the pump;

in FIG. 2 - the design of the module section of the dispersing device (dispersant);

in FIG. 3 - longitudinal view of the apparatus-divider;

in FIG. 4 is a transverse view of the apparatus-divider;

in FIG. 5 is a longitudinal view of a dispersant wheel;

in FIG. 6 is a transverse view of the dispersant wheel;

in FIG. 7 is a longitudinal view of a divider;

in FIG. 8 is a transverse view of a divider.

The proposed pump (Fig. 1) is lowered into the well 1 on pipes 2 and includes an upper pump module 3, a lower pump module 4, a dispersing device 5 and an electric motor 6. The dispersing device 5, made in the form of a module section (Fig. 2) , consists of a cylindrical housing 7, a shaft 8, a screw wheel 9, several dispersing steps, each of which consists of a dissecting apparatus 10 and a wheel 11. In the head 12 of the dispersing module-section

of the device 5, a divider 13 is installed at the outlet of the gas-liquid mixture flow. A screw wheel 9 is installed in the base 14 of the module section of the dispersing device 5. The base 14 is made with channels 15 for the passage of the pumped gas-liquid mixture.

The device-divider 10, the wheel 11 and the divider 13 are made with blades, respectively, 16, 17 and 18.

The pump operates as follows:

The electric motor 6 provides rotation of the pump elements. The gas-liquid mixture flows through the channels 15 of the base 14 to the screw 9, which creates the necessary pressure to move the gas-liquid mixture inside the dispersing device 5. The gas-liquid mixture flows at a certain angle onto the blades of the dissecting apparatus 10, where bubbles are crushed and crushed by mechanical means in the gas-liquid mixture making it more uniform, which is necessary for stable and economical operation of a submersible centrifugal pump. Depending on the flow rate of the gas-liquid mixture pumped by the pump, in order to obtain the optimum angle of attack, at which the most intense dispersion of the gas phase of the blade 16 of the apparatus-divider 10 (Fig. 3.4) can be located at an angle p of not more than 60 ° to the longitudinal the axis of the dispersing device so that there is an axial component of the flow rate of the gas-liquid mixture, directed along the axis to the exit

dispersing device. The wheel 11 is mounted on the shaft 8 of the dispersing device and rotates with the angular velocity of the pump shaft. By means of the blades 17 (Fig. 5,6), installed at an angle 3 also less than 60 ° to the axis of the dispersing device, the wheel 11 imparts a rotational-translational motion of the gas-liquid mixture, providing crushing of the bubbles in the gap between the apparatus-divider 10 and divider 13. Divider 13 using blades 18 (Fig. 7.8) installed at the inlet of the gas-liquid mixture stream, increases the degree of dispersion of the gas phase and transfers the stream to the impeller of the lower section 4 of the pump with minimal losses. This is due to the fact that the blades 18 have a profile in which the plane tangent to the profile of the blade 18 at the inlet of the divider is at an angle pl 10 ... 80 ° to the axis of the dispersing device, and the plane tangent to the profile of the blades at the outlet of the divider is parallel to the axis of the dispersing device. To obtain the maximum dispersion of the gas-liquid mixture, the number of blades 16, 17, 18 of the apparatus-divider, wheels and divider and the angles of their installation are determined experimentally depending on the flow rate of the pumped liquid.

The density of the pitch T of the radial blades of the apparatus-divider, wheel and divider is determined based on the ratio:

t is the pitch of the blades on the diameter D, mm;

1 - the length of the chord of the location of the blades on the diameter D, mm Thus, in the proposed design of a submersible centrifugal pump, when the gas-liquid mixture flows through the module section of the dispersing device, the degree of homogeneity and fineness of gas inclusions increases, and the mixture that is not converted into a homogeneous suspension moves axially and enters the lower section of the pump. Obtaining a homogeneous suspension helps to improve the suction capacity of the centrifugal wheel, which ensures more stable operation of the submersible centrifugal pump as a whole: the vibration of the pump during its operation and the pulsation of the flow in the tubing are reduced, the pump works with a given efficiency, and entering into the tubing, free gas extracted from the gas-liquid mixture, performs additional positive work of lifting the fluid from the well.

Sources of information taken into account when preparing the application:

1.Gafzfov O.G. “Study of the operation features of submersible centrifugal pumps of oil wells containing

gas phase production, dissertation for the degree of candidate of technical science, 1972, Ufa, pp. 52-53, 128-140.

2. Description to ed. No. 494536, F04D1 / 08, 03/11/74

Claims (4)

1. Submersible centrifugal pump for oil production from wells, containing pump sections, in the lower part of which a dispersing device is installed on the shaft, which includes at least two working bodies located along the axis of rotation of the pump shaft, while one of the working bodies made in the form of a wheel, mounted on the shaft, and another, made in the form of a divider apparatus, is fixedly mounted relative to the housing, characterized in that the dispersing device is made in the form of a module section in the housing of the dispersing device three, from the inlet side of the gas-liquid mixture flow, a screw wheel is installed on the shaft, and from the outlet side of the gas-liquid mixture stream, a divider is installed motionless relative to the housing. 2. Submersible centrifugal pump according to claim 1, characterized in that the blades of the apparatus-divider and wheels are installed at an angle of not more than 60 ^o to the longitudinal axis of the module-section of the dispersant with the possibility of creating an axial component of the flow rate of the gas-liquid mixture from the inlet to the outlet of the dispersing device. 3. Submersible centrifugal pump according to any one of claims 1 or 2, characterized in that the plane tangent to the profile of the blade at the inlet of the divider is located at an angle of 10 to 80 ^o to the axis of the dispersant, and the plane tangent to the profile of the blade at the outlet of the divider located parallel to the axis of the dispersant. 4. Submersible centrifugal pump according to any one of the preceding paragraphs, characterized in that the apparatus-divider, wheel and divider are made with at least two vanes.