RU80518U1 - SUBMERSIBLE ELECTRIC PUMP INPUT MODULE - Google Patents

Abstract

The proposal relates to hydraulic engineering, in particular, to submersible electric pump devices for lifting well products to the surface.

The input module of a submersible electric pump, consisting of a housing with a central channel, upper for connecting to the pump and lower for connecting to the electric motor flange connections, as well as with channels communicating the interior of the housing with the outside. The housing is prefabricated, consisting of an upper part with an upper flange connection and a lower part with a lower flange connection, interconnected by a threaded connection. On the part with an internal thread, a cylindrical expansion is made with an axis displaced relative to the axis of the housing and an external process thread on the motor side. The external openings of the channels are located below the technological thread, from the side of the maximum displacement of the expansion relative to the housing in the extension, through channels are made under the cable, laid in them with the possibility of sealing. The inputs and outputs of the through channels are located outside the part of the housing with the extension, above and below the technological thread of the extension.

The proposed input module of a submersible electric pump is simple and cheap to manufacture, more functional in use due to the possibility of using the corresponding typical parts of a prefabricated housing with various combinations of pump and motor sizes.

2 ill. for 2 liters

Description

Input module submersible electric pump.

The proposal relates to hydraulic engineering, in particular, to submersible electric pump devices for lifting well products to the surface.

The well-known "Submersible centrifugal pump for lifting fluid from wells" (patent RU No. 23333396, F04D 13/10, Published: May 27, 2007, Bull. No. 15) includes an input module, which consists of a housing with a central channel with a top for connection with a pump and a bottom for connecting through the tread with an electric motor flange connections, as well as with radial channels communicating the interior of the housing with the outside.

The closest in technical essence is "Submersible centrifugal pump unit" (patent RU No. 2300022, F04D 13/10, 29/44, 29/66, Published: September 10, 2008, Bull. No. 25) including an input module, which consists from the housing with a central channel, upper for connecting to the pump and lower for connecting to the motor flange connections, as well as with radial channels, closed from the outside with a protective mesh and communicating the interior of the housing with the outside.

The disadvantages of these input modules are:

- the inability to rely on the packer and the bottom due to the inability to connect with a protective casing, shank or any external device located outside the pump motor;

- the need for each combination of the type of dimensions of electric motors and pumps to have a separate input module with corresponding flange connections;

- constructive complexity in the manufacture of a one-piece design, requiring more use of expensive equipment for manufacturing and attracting more highly paid specialists, which together leads to a rise in price of the input module itself.

The technical task of the proposed device is to create a simple and cheap to manufacture and functional in application design that allows you to use predefined typical parts of the prefabricated housing for various combinations of pump and motor sizes.

The technical task of the input module of a submersible electric pump, consisting of a housing with a central channel, upper for connecting to the pump and lower for

connections with an electric motor flange connections, as well as channels communicating the interior of the housing with the outer.

What is new is that the housing is prefabricated, consisting of upper parts with an upper flange connection and lower parts with a lower flange connection, interconnected by a threaded connection, and on the part with an internal thread, a cylindrical expansion is made with an axis offset from the axis of the case and an external technological thread on the motor side, while the outer holes of the channels are located below the technological thread, on the side of the maximum extension bias relative to the housing in the extension you through channels are filled under the cable, laid in them with the possibility of sealing, and the inputs and outputs of the through channels are located outside the housing part with the extension, above and below the technological thread of the extension.

Figure 1 shows the input module with a thickening on the upper part of the housing in longitudinal section.

Figure 2 shows the installation diagram of the input module as part of a submersible electric pump with a casing and a shank that interacts with the feed-through packer.

The input module of the submersible electric pump 1 (see Figure 2) consists of a prefabricated housing, consisting of a upper 3 and a lower 4 parts connected by a thread 2 (see Figure 2), with a central channel 5 equipped with technological samples 6 for mounting bearings ( in Fig. 1 not shown) the rotor of the pump 1. The upper part 3 see. Fig. 1) the housing is equipped with an upper flange connection 7 for connection with the pump 1 (see Fig. 2), and the lower part 4 (see Fig. 1) - lower flange connection 8 for connection through the device 9 (gas separator or compensator) (see Figure 2) with an electric motor 10. elem possible a direct connection of the electric motor 10 to the lower connection flange 8 (see FIG. 1). On the upper part 3 (see FIG. 1) with a female thread 5, a cylindrical extension 11 is made with an axis 12 displaced relative to the axis 13 of the housing and an external process thread 14 from the side of the electric motor 10 (see FIG. 2). It is possible to perform the extension 11 (see Fig. 1) on the lower part 4, if the internal thread 5 is made on it and the lower part 4 covers the upper 3, but such an implementation is almost less popular and completely structurally similar to the extension 11 on the upper part 3 of the housing, therefore we will continue to consider only the example of expansion 11 of the upper part 3. The outer holes 15 of the channels 16, communicating the internal space of the housing with the external, are located below the process thread 14. From the side of the maximum displacement of the extension 11 relates casing in extension 11

made through channels 17 under the cable, laid in them with the possibility of sealing (for example: using, for example, glands, cuffs, o-rings or a combination of them - not shown in Fig. 1). The inputs 18 and outputs 19 of the through channels 17 are placed outside the housing part 3 with the extension 11 and, respectively, above and below the technological thread 14 of the extension 11.

The input module operates as follows.

To the electric motor 10 (see FIG. 2) through the device 9 (or directly) with the lower flange connection 8 bolts (shown in FIG. 2 conventionally) are connected to the housing with the upper 3 and lower 4 parts assembled by thread 2 (see FIG. 1) with bearings mounted in the central channel 5. Through the through channels 17, the cable 21 from the electric motor 10 (see FIG. 2) is passed through the mains, or if the whole dimensions allow, followed by sealing by pressing the sealing elements with a clamping nut (not shown in FIG. 1), tightened by thread 20 (see Figure 1). The casing 22 is lowered into the well and fixed. Then, a casing 22 (see FIG. 2) is screwed to the thread 14 of the expansion 11, placed outside the electric motor 10, previously lowered into the casing 22. The casing 22 can be equipped with a shank 23 for interacting with the packer 24 previously installed or lowered as a part of the shank 23. Due to the fact that the inputs 18 and outputs 19 of the through channels 17 are located outside the housing part 3 with the extension 11 and, respectively, above and below the technological thread 14 of the extension 11, the inner space 25 (see Figure 2) of the casing 21 is isolated from the inside risk well space 26. Next, to the housing through the upper flange connection 7 bolts (Fig. 2 shown conventionally) are connected to the pump 1. Then, on the pipe string (not shown in Fig. 2), connected over to the pump 1, with the parallel cable 21 all the complete assembly is lowered into the well 27 until the installation interval, for example: until the liner 23 interacts with the packer 24, which is reflected in a decrease in the weight of the descent equipment, indicated by the wellhead weight indicator (not shown in FIG. 2), or until it stops on the bottom (in FIG. .2 not shown) of well 27, or rebuemy wellbore section 27, as measured during the descent of equipment from the mouth, for example, counting the number of pipes in a pipe string of known length. The casing 22 can also carry only a protective function, protecting the electric motor 10 from impacts on the walls of the borehole 27 and emphasis on the bottom hole (not shown in FIG. 2) of the borehole 27, which is especially important when descending into deviated and complex-profile boreholes 27. Due to the fact that the outside holes 15 (see FIG. 1) of channels 16 communicating the internal space of the housing with the external are located below the process thread 14, the inlet of the pump 1 is in communication with the internal space 25 (see FIG. 2) of the casing 22.

After supplying electricity via cable 21, the electric motor 10 rotates the rotor of the pump 1, which from the inner space 25 of the casing 21 through the channels 16 produces the products of the well 27 through the pipe string to the surface.

Due to the fact that the cylindrical extension 11 (see FIG. 1) is made with an axis 12 offset from the axis 13 of the housing, it allows more efficient use of the inner space 25 (see FIG. 2) of the casing 22 and optimally place the cable 21 located inside the casing 22. This is especially important with the small dimensions of the casing 22 used for small internal diameters of the wells 27 into which the equipment is lowered.

Since the upper 3 (see Figure 1) and the lower 4 parts of the housing individually are shorter than the whole structure, the inner channel 5 and the thread 2 of each of the parts 3 or 4 are made from the same installation on the machine, which eliminates the rotor wearlessness of the electric motor 10 (see FIG. 2) and pump 1. Due to this, the service life of the complete assembly is increased (see FIG. 2), and the prefabricated housing design is easier to manufacture. In this case, the use in wells 27 with different internal diameters, which requires casings 22 of different diameters, with different formation properties (productivity, depth), which requires the use of different motors 10 (the deeper the more powerful the electric motor 10 is required) and pumps 1 ( the more productive the formation, the more productive the pump 1) is required, and this leads to the need for a combination of flange connections 7 and 8 of the output module with different types of pumps 1 and motors 10, respectively. this task with a smaller number of input modules allows the prefabricated design of the input module with parts 3 (see Fig. 1) and 4 having corresponding flange connections 7 and 8 for different sizes of pumps 1 (see Fig. 2) and electric motors 10, but with the same connecting thread 4. For example: for five pump sizes 1 and four types of electric motors 10, twenty one-piece input devices or nine (five upper 3 (see Figure 1) and four lower 4 body parts with the same thread 2) of typical parts 3 and 4 are required prefabricated housing Uhl. All this together makes the prefabricated housing of the input module of the submersible electric pump more universal (functional), which saves materials and simplifies application in various conditions.

The proposed input module of a submersible electric pump is simple and cheap to manufacture, more functional in use due to the possibility of using the corresponding typical parts of a prefabricated housing with various combinations of pump and motor sizes.

Claims (1)

The input module of a submersible electric pump, consisting of a housing with a central channel, upper for connecting to the pump and lower for connecting to the electric motor flange connections, as well as with channels communicating the internal space of the housing with the external, characterized in that the housing is made of prefabricated, consisting of the upper with an upper flange connection and a lower one with a lower flange connection, parts interconnected by a threaded connection, and a cylindrical extension is made on parts with an internal thread with an axis displaced relative to the axis of the housing, and an external process thread on the motor side, while the outer holes of the channels are located below the process thread, from the side of the maximum displacement of the expansion relative to the body in the extension, there are through channels for a cable that can be sealed in them, moreover the inputs and outputs of the through channels are located on the outside of the housing with the extension, above and below the technological thread of the expansion.