RU2586359C1 - Well filter of improved permeability - Google Patents

Abstract

FIELD: water supply.

SUBSTANCE: invention relates to water supply and drainage for equipment of water intake part of wells in aggressive and corrosive media. Slot-type filters with winding of shaped wire are installed in sand-gravel aquifers with circuit of gravel packing and without it, and filters of composite plastic rings or plates under a circuit of gravel packing. Filter includes support bars, winding shaped wire or package ring, or plate of plastic forming horizontal slot. On external surface of shaped wire winding, or composite rings or plates made of plastic has horizontal hemispherical grooves parallel to main horizontal slots having same width and connected to them inclined at an angle of 45° semi-spherical recesses of same width for passage of filtered water from additional recesses inside filter.

EFFECT: higher porosity, service life, reduced power consumption for lifting water.

1 cl, 2 dwg

Description

The invention relates to the field of water supply and drainage for equipment of the water intake part of the wells.

Known designs of filters of wells for water (1-3). They can be made of profiled wire, plastic typesetting rings, plates, etc. Water passage holes in these structures are the gaps between the coiled spiral-wound wire (Johnson and Cook filters), plastic stacked rings or plates. These structures can be installed in drilled wells without cover and with cover for the gravel sprinkling of calculated size. These filter frames are currently the most advanced hydraulically. Considering that the pressure loss of the filtered groundwater on the filters and the life of the wells are directly proportional to their initial permeability, an increase in the duty cycle of the filter frames is given priority (1).

The closest analogue of the invention is a downhole filter containing support rods, coiled profiled wire or plastic collapsible rings, plates that form horizontally located slots, have hemispherical horizontal recesses of the same width on the outer side surface, connected to horizontal culvert slots by vertical hemispherical recesses (3 ) They have a duty cycle of 78-92% and a high permeability exceeding the permeability of Johnson and Cook filters (2) by 1.5-4 times. This design is adopted as a prototype.

Analysis of the operation of the filters shows that their outer surface does not sufficiently participate in the passage of filtration water into the well.

The technical result of the invention is to increase the duty cycle of the filter cages, their water permeability, life and reduce energy costs for raising water while maintaining strength characteristics.

The necessary technical result is achieved by the fact that in the downhole filter containing support rods, coiled profiled wire, or stacked rings, or plastic plates, forming horizontally located slots with horizontal hemispherical recesses, on the outer surface of the profiled wire, stacked rings, plastic plates made horizontal hemispherical recesses parallel to horizontal slots and connected to them by inclined hemispherical recesses at a 45 ° angle mi of the same width. The number of horizontal hemispherical recesses depends on the height of the outer surface of the profiled wire, plastic rings or plates. The size of the horizontal slots, the diameter of the hemispherical horizontal and inclined recesses is determined by the average particle diameter of the gravel particles of the filter sprinkling contour and is generally 1-3 mm. The width of the pillars between the additional horizontal and inclined hemispherical recesses for metal filters is 0.5 mm, plastic - 1 mm. The arrangement of hemispherical horizontal and inclined recesses in metal structures is carried out mechanically, and in plastic structures by the manufacture of appropriate molds. A comparative analysis of the claimed solution with the prototype shows that the claimed device differs from the known one in that the downhole filter has not vertical but inclined hemispherical recesses on the outer surface, made at an angle of 45 ° to connect horizontal hemispherical recesses with horizontal slots between the profiled wire, plastic rings or plates.

Therefore, the downhole filter has a large water intake surface, and the inventive device meets the criteria of the invention of "novelty."

The downhole filter has a duty cycle of 80-95% (5-8% higher than the prototype), water permeability is 10-30% more than the prototype, which allows us to conclude that the technical solution meets the criterion of "significant differences".

Filters are manufactured in the same sizes as the prototype.

The invention is illustrated in FIG. 1-2. In FIG. 1 shows a longitudinal section of the wall of the downhole filter: a) a prototype, b) the proposed design; in FIG. 2 shows an element of the side surface of the proposed downhole filter,

where 1 - profiled wire, typesetting plastic rings, plates;

2 - supporting rod;

3 - passage hole of the slit filter;

4 - hemispherical horizontal recesses on the side surface of the filter frames;

5 - vertical hemispherical recesses on the side surface of the downhole filter;

6 - hemispherical recesses inclined at an angle of 45 ° on the side surface of the downhole filter;

7 - line flow of water into the filter.

Designed filter frames are designed for installation in both non-aggressive and aggressive environments. The greatest effect of their use will take place in large-capacity water intake and drainage wells, as well as in wells designed for a long period of operation, pumping out acids, alkalis, oil products in local zones of environmental disaster.

Literature

1. Gavrilko V.M., Alekseev B.C. Drill hole filters. Edition 2. M .: Nedra, 1976.

2. Jonson Screens by UOP Catalog 169.

3. Patent for the invention of the Russian Federation No. 2132935.

Claims (1)

Slot-hole filter with horizontally located slots, containing support rods, coiled profiled wire, or stacked rings, or plastic plates forming horizontally located slots, characterized in that on the outer surface of the wrapped profiled wire, or stacked rings, or plastic plates horizontal hemispherical recesses are made parallel to horizontal slots having the same width and connected to them by hemispherical recesses inclined at an angle of 45 ° By the same width for passing filtered water into the filter.

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