RU66415U1 - Borehole Filter - Google Patents

Abstract

The utility model relates to the oil and gas industry and can be used in oil and gas production.

The task of creating a utility model: preventing burning of the filter element during welding, increasing the throughput and quality of cleaning liquids and gases entering the filtration and increasing the life of the downhole filter.

The solution to these problems was achieved due to the fact that the downhole filter, including the supporting frame made of a perforated pipe, and a filter element mounted on the supporting frame and closed by a protective casing made of expanded metal sheets, with two sides of each expanded metal longitudinal plates are welded onto the sheet, which are welded to each other during assembly. The edges of the longitudinal plates protrude beyond the edge of the expanded metal sheet and the scan length of the expanded metal with welded longitudinal plates in a cross section of not less than the circumference formed by the outer surface of the filter element. Longitudinal plates come into another by an amount less than the length of the protrusion of the edge of the longitudinal plates beyond the edge of the expanded metal sheet. One of the joined strips is bent outward to the thickness of the plate. The transverse joints of expanded metal sheets are closed by annular plates. Cut-off plugs are installed in the holes of the perforated pipe. The filter element contains at least one filter and at least one drainage mesh.

2 sec P.-Kt F.-ly, 5 Head. P.C., ill. 6.

Description

The utility model relates to the oil and gas industry and can be used in the extraction of liquids and gases from the bowels.

Known downhole filter, which is a steel pipe with holes on which a profiled wire is wound (Gavrilko V.M. Filters for boreholes. M., "Nedra", 1985, p.7-9).

The main disadvantage of this design is the change in the inter-turn gaps when installing the filter in the well, the lack of protection of the filter mesh from mechanical stress during transportation and installation of the filter, which negatively affects the quality of the filter.

Known downhole filter, consisting of a supporting tubular perforated frame and a fibrous filter coating made in the form of individual plates of wire non-woven material, rigidly lapped by welding and soldering on a tubular frame of the filter against perforations (ed. USSR Certificate No. 941548, MKI 3 ЕВВ 43/08, publ. 1982).

The main disadvantage of this design is the presence of welded zones, which over time activates the processes of metal corrosion. The snug fit of the filter element to the perforated pipe significantly reduces the filtration zone, which is limited by the area of the hole in the pipe. There is no protection of the filter element from mechanical influences during transportation and installation of the filter.

A known filter design according to the patent of the Russian Federation for utility model No. 51644, consisting of a supporting frame made of perforated pipe, and a filter coating of wire non-woven material, the filter coating is made in the form of a tubular element and is mounted on the supporting frame in the grooves of the support rings fixed by the sub. Between the filter coating and the supporting frame there is a drainage layer made in the form of a spiral of wire wound on a supporting frame. This spiral forming the drainage layer may be made of spring wire. The tubular filter element is made of wire non-woven material obtained by pressing wire (metal rubber). The metal rubber was developed at the Samara State Aerospace University (formerly Kuibyshev Aviation Institute, Appendix 1) and was used primarily for engine mount dampers. The downhole filter is protected by a casing with holes.

Known downhole filter and method of its manufacture according to the patent of the Russian Federation for utility model No. 38833, a prototype of the method and device. The filter contains a perforated pipe on which a concentric filter element is mounted and, on the outside, a protective casing made of expanded metal sheets.

In the manufacture of the filter, the pipe is perforated, a filter element is installed, then a protective casing is installed and welded with longitudinal seams. Ring joints remain open.

The disadvantage of this method and filter is the possibility of burning the filter element when welding the protective casing. The thickness of the protective casing is 0.6 ... 0.8 mm.

A disadvantage of the known filter design is the rapid clogging of the filter element with mechanical impurities. The protective casing with holes (radial gaps) does not fulfill the function of protecting the filter element from clogging of mechanical particles by large particles, performing the function of protecting the filter from mechanical damage during transportation and installation. In addition, the protective casing with radial clearances creates increased resistance when the fluid passes through the protective casing, which reduces the rate of fluid flow to the filter element and, accordingly, reduces the throughput of the downhole filter.

The task of creating a utility model: preventing burning of the filter element during welding, increasing the throughput and quality of cleaning liquids and gases entering the filtration and increasing the life of the downhole filter.

The solution to these problems was achieved due to the fact that the downhole filter, including the supporting frame made of a perforated pipe, and a filter element mounted on the supporting frame and closed by a protective casing made of expanded metal sheets, with two sides of each expanded metal longitudinal plates are welded onto the sheet, which are welded to each other during assembly. The edges of the longitudinal plates protrude beyond the edge of the expanded metal sheet and the scan length of the expanded metal with welded longitudinal plates in a cross section of not less than the circumference formed by the outer surface of the filter element. Longitudinal plates come into another by an amount less than the length of the protrusion of the edge of the longitudinal plates beyond the edge of the expanded metal sheet. One of the joined strips is bent outward to the thickness of the plate. The transverse joints of expanded metal sheets are closed by annular plates. Cut-off plugs are installed in the holes of the perforated pipe. Filter element

contains at least one filter and at least one drainage mesh.

The proposed technical solution has novelty and industrial applicability, i.e., all the criteria of a utility model.

The novelty is confirmed by patent research, and industrial applicability is doubtful, because An experimental batch of filters using similar technology was manufactured and successfully tested.

The essence of the utility model is illustrated in figure 1 ... 6, where:

figure 1 shows the filter

figure 2 shows a view,

figure 3 ... 5 shows a section along BB,

figure 6 shows the appearance of expanded metal sheet.

The downhole filter (figure 1) contains a frame made of perforated pipe 1, with holes "B" on the side surface, the nipple part 2, the coupling part 3, the filter element 4 mounted concentrically perforated pipe 1 and the protective casing 5 made of perforated - exhaust sheets, with platinum 6 and 7, welded in advance on both sides of expanded metal sheets 5.

The filter element 4 contains at least one filter layer 8 and at least one drainage layer 9. Figure 2 shows a variant with one filter layer 8 and two drainage layers 9. The filter layer 4 can be made, for example, of metal rubber .

The annular joints are closed by an annular plate 10. In the openings “B”, cut-off plugs 11 can be installed (Fig. 1).

FILTER MANUFACTURING OPERATIONS

When assembling a downhole filter, a perforated pipe 1 is made first of all; for this, holes “B” are drilled in it with a diameter of 10 ... 20 mm. In this case, two variants of the filter manufacturing method are possible with or without cutoff plugs 11.

If it is necessary to install shear plugs 11, then through holes are cut through holes “B” and screw shear plugs 11 are screwed into threads pre-lubricated with epoxy resin. If the shear plugs 11 are not used, for example, for injection wells, then the thread is not cut.

A filter element 4 (filter elements) is installed on the surface of the pipe 1, concentrically to it, practically at a length of 90..95% of the total length of the filter. The filter element 4 can be of any design: wire, mesh, from

metal rubber, made of porous ceramics. The remaining filter length is used to thread the nipple part 2 of the mounting of the coupling part 3 and to capture the filter with a drill bit when screwing the filter with the casing. Expanded metal sheets 5 are prepared by welding longitudinal plates 6 and 7 to two sides.

Expanded metal sheets 5 with longitudinal plates 6 and 7, bend concentric filter. Before welding, the protective casing is pulled together with clamps, which are removed after welding (clamps are not shown in FIGS. 1 ... 6). The longitudinal plates 6 and 7 are overlapped and welded together (FIGS. 3 and 4). On the annular joints of expanded metal sheets 5, the lamellar plates 10 are welded overlap (FIG. 2).

The annular plates 10 protect the joints “G” of expanded metal sheets from deformation during transportation and descent of the filter into the well.

Application of the utility model allowed:

1. To prevent burning of the filter element when welding the protective casing.

2. Create a filter that has a very high throughput and has good filtering properties.

3. Ensure long-term operation of the filter without clogging.

4. To prevent clogging of the filter when it is lowered into the well.

5. Simplify the design of the filter.

6. Reduce the cost of the filter.

7. Automate and mechanize filter production. The well filter passed bench and industrial tests and showed high filtering ability and operational reliability.

Claims (8)

1. A downhole filter comprising a supporting frame made of a perforated pipe and a filter element mounted on a supporting frame and closed by a protective casing made of expanded metal sheets, characterized in that longitudinal plates are welded on both sides of each expanded metal sheet, which when assembling the filter are welded to each other. 2. The downhole filter according to claim 1, characterized in that the edges of the longitudinal plates protrude beyond the edge of the expanded metal sheet and the scan length of the expanded metal sheet with welded longitudinal plates in a cross section of not less than the circumference formed by the outer surface of the filter element. 3. The downhole filter according to claim 1 or 2, characterized in that the longitudinal plates extend one below the other by an amount shorter than the protrusion length of the edge of the longitudinal plates beyond the edge of the expanded metal sheet. 4. The downhole filter according to claim 1 or 2, characterized in that one of the joined strips is bent outward to the thickness of the plate. 5. The downhole filter according to claim 1 or 2, characterized in that the transverse joints of expanded metal sheets are closed by annular plates. 6. The downhole filter according to claim 1 or 2, characterized in that the joints of the longitudinal and annular plates are combined. 7. The downhole filter according to claim 1 or 2, characterized in that cut-off plugs are installed in the holes of the perforated pipe. 8. The downhole filter according to claim 1 or 2, characterized in that the filter element contains at least one filter and at least one drainage mesh.