RU71694U1 - SLOT FILTER FILTER - Google Patents

Abstract

The utility model relates to means of ensuring oil and gas production.

The task of creating a utility model is improving the degree of purification of the extracted product.

The solution to this problem was achieved in a slotted well filter containing a perforated pipe on which longitudinal support elements are installed, on the outer surface of which a wire is wound with the formation of gaps between the turns, characterized in that the ratio of the installation step of the longitudinal elements to their height is made in the range from 1, 0 to 10. A filter screen can be installed between the pipe and the longitudinal support elements. A wire is wound between the supporting longitudinal elements and the filter mesh, which acts as a drainage layer. A drainage screen may be installed between the pipe and the filter screen. Between the longitudinal support elements and the filter screen, a drainage screen can also be installed.

1 sec P.-Kt F.-ly, 4 Head. P.C., ill. 6.

Description

The utility model relates to means of ensuring oil and gas production.

Known downhole filter according to the patent of the Russian Federation for invention No. 2079638, containing a perforated pipe and a filter element.

Disadvantage: the possibility of damage to the filter element during transportation and descent into the well.

Well-known filter according to A. St. USSR No. 1645470, containing a perforated pipe, on which is laid a wire filter element made of wire with protrusions. The wire is not welded to the longitudinal elements.

The protrusions placed quite often on the wire provide a constant gap between rows of -δ, which is maintained during small deforming loads that occur during transportation and lowering of the slotted downhole filter into the well. At high loads, it is possible to displace several rows of wire and form an open gap of a width of several mm, through which large foreign particles will pass.

The task of creating a utility model: increasing the production rate of the extracted product and improving the degree of purification of the extracted product.

The solution of this problem was achieved in a slotted well filter containing a perforated pipe on which longitudinal support elements are installed, on the outer surface of which a wire is wound with the formation of gaps between the turns, so that the wire is welded or soldered to the longitudinal elements, and the ratio of the installation step of the longitudinal elements to their height is made in the range from 1.0 to 10. A filter screen can be installed between the pipe and the longitudinal support elements. A wire is wound between the supporting longitudinal elements and the filter mesh, which acts as a drainage layer. A drainage screen may be installed between the pipe and the filter screen. Between the longitudinal support elements and the filter screen, a drainage screen can also be installed.

The proposed technical solution has novelty and industrial applicability.

The essence of the utility model is illustrated in figure 1 ... 7, where:

- figure 1 shows the slotted filter assembly.

- figure 2 - shows a section aa,

- figure 3 - shows a section aa of the slotted filter with a filter mesh,

- figure 4 - shows a section aa of the slit filter with filter and drainage nets,

- figure 5 and 6 is a diagram for calculating the maximum angle between the longitudinal support elements.

- Fig.7 - shows a scan of the filter element of the slotted filter.

The proposed design of the slotted well filter (FIGS. 1 and 2) contains a perforated pipe 1 with holes “B”, a slotted filter element 2 made of wire 3 wound on the longitudinal support elements 4 with the formation of slots - δ and welded or welded on the perforated pipe soldered to them.

It is possible to install a filter mesh 5 between the perforated pipe 1 and the longitudinal supporting elements 4. (Fig.3), it is also possible to install a drainage mesh 6 between the perforated pipe 1 and the filter mesh 5.

To justify the optimality of the t / H size ratio, prototypes were prepared and tested on water, Table 1, and the average monthly water production rate was determined. When calculating for 100%, the water flow rate for downhole filters with t / H = 2.0 is taken. Comparison of the water flow rate for each filter was made with the average monthly flow rate of this filter.

Table 1 Option No. - one 2 3 four 5 6 7 8 Height, N mm 5,0 4.0 3,5 5,0 4.0 4.0 3.0 3.0 Height h mm 3.0 3.0 2,5 4.0 3.0 3.0 2.0 2.0 Step t mm 4.0 4.0 7.0 10.0 twenty 40 39 45 Diameter, d Mm one hundred one hundred 70 70 168 one hundred one hundred one hundred t / h - 0.8 1,0 2.0 2.0 5,0 10.0 13.0 15.0 Debit % 77 95 one hundred one hundred 98 95 82 71 Output - No Optimally No No

If we accept an acceptable decrease in flow rate by 5% compared with its maximum value, then the optimal ratio will be t / H = 1.0 ... 10.0.

With a t / H ratio of less than 1.0, the longitudinal support elements will clutter more than 50% of the annular section between the perforated pipe 1 and the slit filter element 2, which will impair drainage of the produced product, and with a ratio of more than 10 the wire forming the slit filter element will touch the perforated pipe , which will also impair drainage of the produced product along the perforated pipe.

The calculation justification scheme for choosing the size ratio is shown in FIGS. 5 and 6. From the geometric relationships, it follows:

where: R = d / 2,

H is the height of the longitudinal support element before welding.

H is the height of the longitudinal support element after welding.

During operation, a downhole filter is installed as part of a casing string in the region of an oil or gas reservoir. The produced product passes through slots 5, the size of which is determined by the customer, depending on the viscosity of the product in the field. Usually δ = 0.1 ... 1.0 mm. Filtration of the produced product takes place on the slit filter element 2, which then passes through the holes “B” inside the perforated pipe 1.

Application of the utility model will allow:

1. To increase the flow rate of the well due to the rejection of protrusions on the wire and optimization of the aspect ratio of the longitudinal elements

2. To improve the degree of purification of the extracted product due to the fact that:

- welding or soldering the wire to the longitudinal elements increased the strength of the filter and reduced the likelihood of deformation of the wire with the formation of large gaps between them,

- in case of partial deformation or damage to the slotted filter element, which, nevertheless, can occur during transportation or installation of a downhole filter as part of a drill pipe string into the bottom of the well, the filter screen will not allow large foreign particles to pass through,

3. To simplify the design and manufacturing technology of the wire used as a filter element.

Claims (5)

1. A slotted well filter containing a perforated pipe on which longitudinal support elements are installed, on the outer surface of which a wire is wound to form gaps between the turns, characterized in that the wire is welded or soldered to the longitudinal elements, and the ratio of the pitch of installation of the longitudinal elements to their height performed in the range from 1.0 to 10. 2. The slotted well filter according to claim 1, characterized in that a filter screen is installed between the pipe and the longitudinal support elements. 3. The slotted well filter according to claim 2, characterized in that a wire is wound between the supporting longitudinal elements and the filter mesh, which acts as a drainage layer. 4. The slotted well filter according to claim 2, characterized in that a drainage grid is installed between the pipe and the filter screen. 5. The slotted well filter according to claim 1, or 2, or 3, characterized in that a drainage mesh is installed between the longitudinal support elements and the filter mesh.