RU57807U1 - Borehole Filter - Google Patents

Abstract

The proposal relates to techniques for extracting a product from wells, namely, downhole filters for filtering a product extracted from oil, water and gas wells. The downhole filter consists of a perforated pipe with a sleeve screwed onto it from above and a metal mesh on the outside. A metal mesh covers the outer surface of the perforated pipe. An additional sleeve is screwed onto the perforated pipe below. Outside the metal mesh, between the coupling and the additional coupling, an additional perforated pipe is installed, which is telescopically fixed relative to the perforated pipe with screws fixing coaxially the perforation holes of the perforated and additional perforated pipes. In addition, an additional perforated pipe protects the metal mesh from mechanical damage during the descent of the well filter into the well. The proposed downhole filter is simple to manufacture and easy to assemble, which can be carried out in the field, in addition, it is maintainable, which generally saves significant material and financial resources. 2 ill. for 1 liter

Description

The proposal relates to techniques for extracting a product from wells, namely, downhole filters for filtering a product extracted from oil, water and gas wells.

Known downhole filter (patent RU No. 2190758, IPC 7 E 21 V 43/08; E 03 3/18 publ. In bull. No. 28 of 10/10/2002), consisting of a housing with perforation holes, a filter shell formed turns of a winding wire on longitudinal rods - stringers, a casing forming a chamber with the housing hydraulically connected by perforations with an axial channel, the casing being made in the form of components installed under the turns of the filter sheath, while the constituent elements of the casing are made in the form of a triangular or t rapezoidal shape and installed with a gap relative to the turns of the winding wire.

The disadvantages of this downhole filter are:

- firstly, the complexity of the design, due to the large number of nodes and parts;

- secondly, technologically difficult to manufacture parts (stringers, frame, constituent elements of the casing) which increases the cost of the finished product, in addition, the filter must be assembled in specialized workshops (laying turns of winding wires).

The closest in technical essence is the downhole filter (patent RU No. 2097533, MKI 6 E 21 V 43/08 published in Bulletin No. 33 of 11/27/1997), including a perforated pipe with a sleeve, a metal mesh covering the outer surface of the perforated pipes and wire winding, while the perforated pipe on its outer surface is made with ribs whose height is determined by calculation, while the ribs are arranged in a spiral with a step to the width of the grid.

The disadvantages of this downhole filter are:

- firstly, the complexity of manufacturing and installing the ribs on the outer surface of the perforated pipe with a certain step, as well as the complexity of the assembly due to the winding of the wire winding on a metal mesh;

- secondly, low maintainability, due to the fact that the metal mesh on the outside has no protection and in case of mechanical damage in the process

descent into the well and / or during operation, it fails and requires a complete replacement.

The technical task of the utility model is to simplify the manufacturing and assembly technology of a downhole filter, as well as increase its maintainability.

The stated technical problem is solved by a downhole filter, including a perforated pipe with a sleeve, a metal mesh covering the outer surface of the perforated pipe.

What is new is that an additional sleeve is screwed on the bottom of the perforated pipe, and an additional perforated pipe is installed between the sleeve and the additional sleeve on the outside of the metal mesh, which is telescopically fixed relative to the perforated pipe with screws that fix the coaxial perforation holes of the perforated and additional perforated pipes.

The figure 1 shows the proposed filter in longitudinal section.

The figure 2 shows a view - a metal mesh well filter.

The downhole filter (see figure 1) consists of a perforated pipe 1 with a sleeve 2 screwed onto it from above and a metal mesh 3 (see figure 2) from the outside.

The metal mesh 3 (see figure 1) covers the outer surface of the perforated pipe 1. From below, an additional sleeve 4 is screwed onto the perforated pipe 1.

On the outside of the metal mesh 3, between the clutch 2 and the additional clutch 4, an additional perforated pipe 5 is installed, which is telescopically fixed relative to the perforated pipe with screws 6, which fix coaxially the perforations 7 and 8, respectively, of the perforated 1 and additional perforated 5 pipes. In addition, an additional perforated pipe 5 protects the metal mesh 3 from mechanical damage during the descent of the downhole filter into the well.

Well filter works as follows.

Depending on the operating conditions of the reservoir, namely flow rate, fractional composition of mechanical particles, viscosity, water cut, etc., the mesh sizes 9 of the metal mesh 3 are selected (see Fig. 2).

The downhole filter assembly, as shown in FIG. 1 as part of the layout of the downhole equipment (not shown in FIGS. 1 and 2), is lowered into the well and installed in a predetermined interval of the reservoir. Wellhead equipment is installed and the well is put into operation. In this case, the reservoir fluid through the perforated holes 8 of the additional perforated pipe 5 enters

to cells 9 of the metal mesh 3, where the formation fluid is filtered. Next, the cleaned formation fluid passing through the metal mesh 3 through the perforated holes 7 of the perforated pipe 1 enters the perforated pipe 1, from where it enters the axial channel of the pipe tubing string (not shown in Figs. 1 and 2).

During the operation of the well filter, mechanical damage by the filtrate of the cells 9 (see Fig. 2) of the metal mesh 3 at the place of formation fluid filtration is possible. To restore the downhole filter, it is removed from the well. The clutch 2 is turned off (see FIG. 1) and / or the additional clutch 4, as well as the screws 6. They are telescopically removed from the metal mesh 3, the perforated pipe 5 mounted on it and the metal mesh 3 is turned relative to the perforated pipe 1 until damaged the cells 9 of the grid 3 will not be between the perforated holes 7 of the perforated pipe 1. Next, the well filter is assembled in the reverse order. After that, he again in the layout of downhole equipment is lowered into the well and run the latter into operation.

The proposed downhole filter is simple to manufacture and easy to assemble, which can be carried out in the field, in addition, it is maintainable, which generally saves significant material and financial resources.

Claims (1)

A downhole filter, including a perforated pipe with a sleeve, a metal mesh covering the outer surface of the perforated pipe, characterized in that an additional sleeve is screwed on to the bottom of the perforated pipe, with an additional perforated pipe installed between the sleeve and the additional sleeve that is telescopically mounted relative to the perforated pipe pipes with screws fixing coaxially perforated holes of perforated and additional perforated patras Cove.