RU2456054C1 - Recoverable aperture filter - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to pull-out of holes, particularly, to filters for cleaning washover fluid from mechanical impurities. Proposed device comprises casing with inlet union, rotary edge filter element fitted on the shaft between top and bottom discs, driven top cover with outlet union, bottom chamber with sediment discharge union, and device to remove sediment from filter element arranged inside the casing. Side surfaces of top and bottom discs are provided with one tooth arranged one above the other. Tooth thrusts are arranged on casing inner wall. Aforesaid device to remove sediment from filter element is made up of brush strip.

EFFECT: reduced costs, faster flushing-out.

4 dwg

Description

The present invention relates to techniques for the overhaul of wells, in particular to filters for cleaning washing fluid from mechanical impurities.

A known set of filters for coarse and fine cleaning, located in the compartments for receiving and pumping the chute capacity mounted on the chassis of the trailer (JSC "Leninogorsk plant AvtoSpetsOborudovanie", www.tataso.ru/emkosti/).

The disadvantages of the filter set are the low degree of purification of the washing liquid and the considerable duration of the washing process.

A well-known mobile filter located on the chassis of a car with a pumping unit, consisting of a cylindrical body with inlet and outlet nozzles, a top cover and a filtering element of a bag-type polypropylene fabric (utility model patent No. 87746 of the Russian Federation, E01B 43/08, 2009).

The disadvantages of the mobile filter are the fast contamination of the filter element when cleaning the wash liquid with a high content of solids and oil and the impossibility of its regeneration.

Known mobile filter, consisting of two horizontal housings with slotted filter elements mounted on a trailer (ZAO "Strong", www.oilgasfilter.ru/catalog).

The disadvantages of the filter are the short operating time with heavily contaminated liquids due to the loss of throughput of the filter elements and the need for frequent interruption of the process for their regeneration. The regeneration of the filter is carried out in counterflow or on the filter elements removed from the housings, which leads to unproductive losses of liquid and an increase in the duration of the process.

A regenerated slotted filter is known, comprising a housing with a fitting for entering contaminated liquid, an upper cover with a rotary drive and a fitting for leaving purified liquid, a lower chamber with a fitting for leaving sediment, a rotating slotted filter element located on the shaft between the lower and upper disks, and a knife for removal of mechanical impurities, mounted on the inner generatrix of the housing (patent No. 2329085 of the Russian Federation, B01D 29/44, 2008).

The disadvantage of the filter is the possibility during regeneration of the slit filter element by forcing the knife to press pollutant particles into the gap, which causes incomplete restoration of the passage section of the gap.

This utility model solves the problem of creating a regenerable slit filter for cleaning flushing fluid, which has increased regeneration efficiency and is simultaneously adapted for transportation to a car chassis and operation in an oil field.

The problem is solved in that in the regenerated slotted filter containing a housing with an inlet fitting, a rotating slotted filter element located on the shaft between the lower and upper disks, an upper cover with a rotation drive and an outlet fitting, a lower chamber with a fitting for sediment outlet, a device for removing sludge placed inside the housing, according to the invention, on the side surface of the upper and lower disc there is one tooth placed one above the other, on the inner wall of the housing for teeth made stops, and the device for removing sediment is made in the form of a brush rail.

The height of the teeth and stops is selected from the condition of their collision when the slotted filter element rotates clockwise or counterclockwise.

Alternatively, the teeth can be located on the outer base of the upper and lower disks, while the size and shape of the teeth should ensure that they perform the same function.

In the wall of the filter housing can be installed with the possibility of radial movement of the shock mechanism or mechanisms in contact with the slotted filter element.

The discrete bristle brush rail has an improved ability to remove contaminant particles from the gap and does not push them inside the filter. The brush rail has an adjustable gap between the rows of bristles and a slit filter element.

The rotation drive is carried out manually to eliminate the likelihood of collapse of the teeth and stops during impact.

The slotted filter can be placed on the chassis with a pump unit and equipped with a lifting mechanism for easy operation.

Figure 1 schematically shows the regenerated slotted filter of the claimed design, figure 2 is a cross section of the filter, a section aa of figure 1, figure 3 is a cross section of the filter at the time of collision of the tooth with emphasis during regeneration, figure 4 - a longitudinal section of the slit filter element.

The regenerated slotted filter (Fig. 1) consists of a cylindrical housing 1 with a nozzle 2 for the entry of contaminated liquid, an upper cover 3 with a rotation drive 4 and a nozzle 5 for the outlet of the cleaned liquid, a lower chamber 6 with a nozzle 7 for the exit of sediment, a rotating slotted filter element 8 mounted on the shaft 9 between the upper disk 10 and the lower disk 11, the brush rail 12 to remove mechanical impurities, mounted on the inner generatrix of the housing 1. On the side surface of the disks 10 and 11 there is one tooth 13 placed one n d others, and on the inner wall of the housing 1 on the drive level 10, 11 installed on one abutment 14 for the teeth 13 (Figures 2, 3).

The housing 1 is separated from the upper cover 3 and the lower chamber 6 by partitions 15 with holes (Fig. 1). The slotted filter element 8 is made of longitudinal rods 16 and welded to them at the contact points of the wound prismatic profile 17, forming a continuous gap 18 between the turns of guaranteed width (figure 4).

The proposed regenerated slotted filter operates as follows. To flush the well, the filter is delivered on the chassis with the pump unit to the well pad and, using a lifting mechanism, is installed between the chute container and the pump unit (not shown). The inlet fitting 2 of the filter is connected to the pumping compartment of the chute capacity, and the outlet fitting 5 is connected to the input of the pump unit. The discharge from the pump unit is lined to the wellhead piping.

When flushing the well, the pump unit pumps the initially clean flushing fluid through the annulus into the well. In the well, the fluid captures contaminants in the form of sand, proppant, rust and oil and returns through the tubing string to the surface, where it is preliminarily cleared of the largest particles in the groove tank.

From the pumping compartment, the washing liquid enters the regenerated slotted filter through the inlet 2 and is in the annular gap between the filtering element 8 and the wall of the housing 1 (Fig. 1).

When passing through the filter element 8 from the washing liquid particles are removed, the size of which exceeds the width of the slit 18 (figure 4). Particles linger over slit 18, forming conglomerates. In this case, the largest conglomerates of particles under the influence of gravitational forces are separated from the filter element 8, settle down the housing 1 and through the holes in the partition 15 fall into the lower chamber 6. Through the nozzle 7, the accumulated impurities are removed from the filter as necessary.

The purified flushing fluid through the holes in the upper partition 15 enters the upper cover 3 and then through the outlet pipe 5 is fed to the inlet of the pump unit, which pumps it into the well. The process is carried out circularly until the liquid acquires a light shade.

Part of the mechanical impurities firmly held on the filter element 8 is removed during regeneration of the filter. To do this, using the actuator 4 mounted in the upper cover 3, the shaft 9 is rotated, for example, clockwise. The slotted filter element 8 assembly with the upper and lower disk 10, 11 rotates together with the shaft 9 (figure 2). Brush rail 12, in contact with the bristles of the filter element 8, removes mechanical particles adhering to the prismatic profile 17 and stuck in the slit 18 (figure 4). The rotation of the filter element 8 occurs before the collision of the teeth 13 on the upper and lower disks 10, 11 with the stops 14 on the inner surface of the housing 1 (figure 3). When a collision filter element 8 is sharply braked. The particles of the pollutant due to inertial forces are separated from the filter element 8 and ultimately end up in the lower chamber 6. After the teeth 13 and the stops 14 collide, the slotted filter element 8 is rotated by the actuator 4 in the opposite direction, that is, counterclockwise until the next teeth collision about the emphasis. The process continues in a cyclic mode and ends with the complete removal of particles from the slit 18 of the filter element 8 and the restoration of the filter capacity.

Involvement in the process of regeneration of inertial forces arising during a sudden stop of the slit filter element at the time of impact of its teeth on the stops on the housing, intensifies the cleaning of the contaminated filter element.

The proposed filter reduces labor costs for regeneration and unproductive losses for maintenance, which speeds up the process of flushing the well.

Claims (1)

A regenerated slit filter, comprising a housing with an inlet fitting, a rotating slit filter element located on the shaft between the lower and upper disks, an upper cover with a rotation drive and an outlet fitting, a lower chamber with a nozzle for releasing sediment, a device for removing sediment from the filter element, located inside the housing, characterized in that on the lateral surface of the upper and lower disc there is one tooth placed one above the other, stops are made on the inner wall of the housing for teeth, and the device Your removal of sediment is made in the form of a brush rail.

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