RU2364709C2 - Multipurpose well screen - Google Patents

Abstract

FIELD: oil-and-gas industry.

SUBSTANCE: invention relates to mining industry, particularly to oil-and-gas production and can be used while reclamation of oil and gas wells. Multipurpose well screen contains perforated pipe with nipple and socket parts, concentrically to which it is installed filter element. Filter element is implemented of rings, butts of which are contacted. At one or both butts of rings it is implemented knurling. Knurling is implemented crosswise or tangential.

EFFECT: increasing of flow capacity of filter at winning of oil or gas.

6 cl, 12 dwg

Description

The invention relates to the mining industry, namely to oil and gas, and can be used in the development of oil and gas wells.

Known downhole filter according to the USSR AS No. 1645470, containing a perforated pipe on which a wire filter element with protrusions is laid. The protrusions placed quite often on the wire provide a constant gap between the rows.

The disadvantage of the filter is the possibility of deformation of the wire during transportation of the filter or its installation in the well. This can lead to a local increase in the gap between the rows of wire and the passage at the wellhead of large particles of foreign impurities.

Known gravel downhole filter for St. RF for utility model No. 3830, containing a perforated pipe with a sleeve and nipple parts and a filter element in the form of a filter mesh and a protective casing. The mesh size of the filter element is 0.15 ... 0.25 mm.

Disadvantage: the filter is not suitable for the production of viscous oil for two reasons:

the small mesh size of the filter mesh and the imposition of the filter mesh at the joints on top of each other, which leads to an additional reduction in the cross-section at the location of the layers of the filter mesh.

A known filter for water intake, water-reducing and hydrogeological wells according to the USSR AS No. 192125, containing ring elements with supporting platforms, forming radially receiving water channels, while the ring elements are bolted together in several places.

The disadvantages of this design are:

- large dimensions and weight of the filter, due to the fact that the outer diameter of the annular elements with this arrangement should be 1.5 ... 2.0 of the diameter of the casing, because on the ring elements, it is necessary to place fixing bolts around the circumference,

- low strength compared to filters in which a perforated pipe is used as a power frame, because the cross section of the pipe, taking into account the perforation, will always be larger than the cross section of several bolts,

- low manufacturing and assembly difficulties due to increased requirements for accurate alignment of bolt holes,

- the possibility of deformation of the filter by filtering elements during descent into directional and horizontal wells due to low rigidity and lack of a power frame.

In addition, the filter according to the USSR AS No. 192125 is not intended for use in the oil and gas industry. The impossibility of using such filters in the oil and gas industry is due, first of all, to the large diameter of the filter, and secondly, to its low strength. Thus, this filter has a different purpose.

Known downhole filter for the USSR AS No. 1472648, prototype. This filter contains a perforated pipe with connecting parts, one of which is made in the form of a coupling, concentric with a filter element made of rings.

Disadvantages: low filter throughput and poor processability.

The objective of the invention is to simplify the technology, increase its throughput capacity in oil or gas production.

The solution to this problem was achieved due to the fact that the universal downhole filter containing a perforated pipe with nipple and coupling parts concentrically installed a filter element made of rings, the ends of which are in contact, and grooves are made on one or both ends of the rings, while the grooves are made crosswise or tangentially. The grooves at the opposite ends of the adjacent rings are made opposite in direction. The profile of the grooves is rectangular. The profile of the grooves is triangular. The rings are made of stainless steel. The rings are made of plastic.

The proposed technical solution has novelty, inventive step and industrial applicability, i.e. all the criteria of the invention.

The novelty of the technical solution is confirmed by patent research. Industrial applicability is due to the fact that non-deficient materials and known technologies are used in the manufacture of the filter.

The invention is illustrated in figure 1 ... 12, where:

- figure 1 shows the universal downhole filter assembly,

- figure 2 shows a section aa,

- figure 3 shows a view of B for the first embodiment of the filter element,

- figure 4 shows a view B for the second embodiment of the filter element,

- figure 5 shows a view of the first embodiment of the ring of the filter element,

- figure 6 shows a view of a second variant of the ring of the filter element,

- figure 7 shows a view of a third variant of the ring of the filter element,

- Fig.8 shows a section bb for the sixth version of the filter,

- figure 9 shows a section bb,

- figure 10 shows a section bb,

- figure 11 shows a view of a fourth embodiment of a ring of a filtering element (a dash-dot line shows knurling from the opposite side of the ring),

- Fig.12 shows a section GG.

The proposed design of a universal downhole filter (Fig.1 ... 12) contains a perforated pipe 1 with holes "D", nipple and coupling parts, respectively 2 and 3, a filter element 4 mounted concentrically perforated pipe 1. The filter element 4 is made of rings 5, in contact with each other at the ends and having recesses of the grooves 6 at one or both ends. The recesses of the grooves 6 can be knurled. The rings 5 are sandwiched between the stop 7 and the nut 8.

The ends of the rings 5 can be made conical (figure 4). The recesses of the grooves 6 can be made radial (figure 5), or tangential (figure 6), or cruciform (figure 7).

The recesses of the grooves 6 on the opposite ends of the adjacent rings 5 can be made opposite in direction (Fig. 11). On the outer surface of the perforated pipe 1, longitudinal elements 9 can be made on which rings 5 are concentrated (FIG. 2). The thickness of the rings 5 (Fig) L = 1,0 ... 3,0 mm, the outer diameter of the rings Df should be no more than the diameter of the coupling Dm. Due to the fact that the outer diameter of the rings 5 of the filter element Df is less than or equal to the diameter of the coupling Dm, damage to the filter element during descent into the well and during transportation is excluded.

The profile of the recesses of the grooves 6 can be made triangular (Fig. 8), or radial (Fig. 9), or rectangular (Fig. 10). Rings 5 are made of stainless steel or plastic. The depth of the grooves h and their width a 0.1 ... 1.0 mm determine the degree of filtration.

During operation, the produced product containing impurities passes through the recesses of the grooves 6 on the rings 5 and then through the holes “D” inside the filter. Due to the fact that the size of the recesses of the grooves 6 of the rings 5 of the filter element 4 is 0.1 ... 1.0 mm, larger particles are filtered out and do not reach the pumping equipment and valves installed at the wellhead, which will prevent their premature wear. The specified form of the mutual arrangement of the grooves and their implementation at both ends allows to increase the throughput of the downhole filter.

The use of the invention will allow to obtain a number of advantages compared to previously used downhole filters, namely:

1. Provide minimal hydraulic resistance to the passage of viscous oil and thereby increase the oil flow rate.

2. Simplify the design of the filter.

3. To provide high adaptability of the filter.

4. Reduce the weight of the filter by simplifying the design.

5. Reduce filter manufacturing costs.

6. Accelerate the process of preparing the well for operation.

7. To reduce the economic costs of well development.

Claims (6)

1. A universal downhole filter containing a perforated pipe with nipple and coupling parts, which is concentrically mounted with a filter element made of rings whose ends are in contact and knurled at one or both ends of the rings, characterized in that the knurling is made crosswise or tangentially to increase filter bandwidth. 2. The universal downhole filter according to claim 1, characterized in that the tangential knurling on the opposite ends of adjacent rings is made in the opposite direction. 3. The universal downhole filter according to claim 1, characterized in that the profile of the knurling recesses is rectangular. 4. The universal downhole filter according to claim 1, characterized in that the profile of the knurling recesses is triangular. 5. The universal downhole filter according to claim 1, characterized in that the rings are made of stainless steel. 6. The universal gas filter according to claim 1, characterized in that the rings are made of plastic.

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