RU209131U1 - Sludge trap for submersible centrifugal electric pump - Google Patents

Abstract

The utility model relates to oil-producing equipment and can be used to protect a submersible downhole centrifugal electric pump (ESP) from mechanical impurities entering the pump intake during formation fluid (oil) production from a well. The technical result, which consists in simplifying the assembly / disassembly of the claimed solution, is achieved due to the fact that the sludge trap for a submersible centrifugal electric pump contains a cylindrical body with internal and external connecting threads, into the stepped hole of which a pipe is screwed, made from one pipe section. At the second end of the pipe, a tip with radial holes for the passage of liquid and a centralizer are installed by means of a threaded connection. The tip with the centralizer is made in the form of one single piece. 2 w.p. f-ly, 2 ill.

Description

The utility model relates to oil-producing equipment and can be used to protect a submersible downhole centrifugal electric pump (ESP) from mechanical impurities entering the pump intake during formation fluid (oil) production from a well.

Known sludge trap (patent RU 134254, F04D 13/10, publication date 11/10/2013), consisting of a branch pipe, to the lower end of which a washer is welded, which is clamped in the coupling connection of the tubing through one tubing above the check valve of the submersible installation centrifugal pump, and the upper part of the pipe has slotted holes for the passage of the produced fluid and is plugged with a cone, the base diameter of which is greater than the outer diameter of the pipe.

The disadvantages of the known sludge trap are limited by the length of the nozzle volume for collecting mechanical impurities, the inconvenience of transportation and storage due to non-separable design of the nozzle.

A sludge trap is known (patent RU 102367, E21B 34/06, publication date 02/27/2011), taken as a prototype, containing a cylindrical body with internal and external connecting threads, in the hole of which a holder with a pipe screwed into it is installed. The sludge trap is equipped with a cylindrical tip with radial holes for the passage of liquid, mounted on the second end of the pipe by means of a threaded connection, while the sludge trap pipe is made as a team, consisting of one or more series-connected pipe sections with the possibility of their replacement.

The disadvantages of the known technical solution are the complexity of the design, assembly / disassembly of the product, low reliability due to the large number of parts, namely, to fix the pipe to the body, an additional nut is used, fixed in the body by means of a retaining ring, the centralizer is made in the form of a washer with elastic petals, fixed on ferrule with a connecting washer and bolt.

The objective of the utility model is to create a reliable, simple and easy to use when assembling/disassembling a sludge trap for a submersible centrifugal electric pump.

The technical result obtained by solving the problem is to simplify the device assembly/disassembly.

The technical result is achieved by the fact that in the sludge trap for a submersible centrifugal electric pump, containing a cylindrical body with internal and external connecting threads, in the stepped hole of which a pipe is installed, at the second end of the pipe a tip with radial holes for the passage of liquid and a centralizer is installed by means of a threaded connection, a pipe is made consisting of one pipe section, according to the utility model, the pipe is screwed into the stepped hole of the body, and the tip with the centralizer is made in the form of one piece.

Installation of the pipe (screwing) directly into the threaded stepped hole of the body allows the assembly of the sludge trap without the use of additional parts and fixing devices, which simplifies the design of the device, as well as the assembly / disassembly of the sludge trap.

The execution of the tip with the centralizer in the form of one (solid) part simplifies the process of assembly/disassembly of the device, improves ease of use.

The technical result is also achieved by the fact that the second end of the pipe and the tip are interconnected by a threaded coupling, which simplifies the process of assembly/disassembly of the product.

Alignment protrusions on the sludge trap centralizer make it possible to securely fix the position of the device in the tubing string, which eliminates radial vibrations and movement of the sludge trap during operation of the ESP pump, and reduces the wear of the plant parts as a whole.

Compliance of the claimed utility model with the criterion of "industrial applicability" is shown on the example of a specific implementation of a sludge trap for a submersible centrifugal electric pump.

Figure 1 shows a General view of the sludge trap for a submersible centrifugal electric pump, figure 2 - section A-A sludge trap.

The sludge trap contains a cylindrical body 1 (figure 1), in the stepped hole of which a thread 2 is made, into which a pipe 3 with an annular gap 4 is screwed. The second end of the pipe 3 is connected to the tip 5 by means of a threaded sleeve 6. fluid passage. Tip 5 and centralizer 8 are made in the form of one (solid) part. Centralizer 8 is equipped with centering protrusions 9 and grooves 10 (Fig. 2) for the passage of liquid. The lower part of the body 1 is provided with an external thread 11 for connection with the ESP unit, in particular with the valve device (not shown), or for installing a transport plug 12. The upper part of the body 1 is provided with an internal thread 13 for connecting the tubing string (not shown).

The device works as follows.

Formation fluid with the ESP pump running enters the internal cavity of the body 1 and, passing inside the pipe 3 of the sludge trap, through the holes 7 of the tip 5, enters the tubing string connected to the body 1 of the sludge trap (not shown), and is brought to the surface.

When the ESP pump is stopped and the valve device (not shown) is closed, particles of mechanical impurities settle under the action of gravity, which fill the annular gap 4 between the sludge trap pipe 3 and the inner surface of the tubing string, protecting the downstream working bodies of the ESP unit (not shown) from clogging.

Thus, the proposed technical solution for a sludge trap for a submersible centrifugal electric pump has a simple, reliable design and improves ease of use.

Claims (3)

1. A sludge trap for a submersible centrifugal electric pump, containing a cylindrical housing with internal and external connecting threads, in the stepped hole of which a pipe is installed, at the second end of the pipe a tip with radial holes for the passage of liquid and a centralizer is installed by means of a threaded connection, the pipe is made consisting of one pipe section, characterized in that the pipe is screwed into the stepped hole of the body, and the tip with the centralizer is made in the form of one piece. 2. Sludge trap according to claim 1, characterized in that the second end of the pipe and the tip are interconnected by a threaded sleeve. 3. Sludge trap according to claim 1, characterized in that the centralizer is equipped with centering protrusions and grooves for the passage of liquid.

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