SU1649050A1 - Device for cleaning filters of water intake wells - Google Patents

Abstract

The invention relates to the construction and operation of water wells and is intended to clean them of clogs. The purpose of the invention is to intensify the cleaning process by increasing the oscillation frequency of the piston. The device consists of an open bottom cylindrical housing 1, in the lower part of which there is a piston 2 connected by a rod 3 with an additional piston 4 of smaller diameter. A spring 6 is installed between the piston 4 and the cover 5, adjustable by a screw 7. The body 1 is divided by a partition 8 with a bypass channel 9 into the top 10 and bottom 11 chambers. In chambers 10 and 11, valves 12, 13 are installed, interconnected by rods 14 and pressed against partition 8 by springs 15, 16. In housing 1, a channel 17 is made to supply compressed air to chamber 10 through a hose 18 and channel 19 to drain compressed air from chambers 11 to the ground through a hose 20. Channel 17 also communicates with the cavity of an elastic chamber 21 located on the side surface of the housing 1 and acting as an inflatable packer. The rods 22 are attached to the housing 1, on which a conical reflector 23 is installed, which localizes the well filter section to be treated, 1 CFL, 1 sg. ate with

Description

The invention relates to the construction and operation of water wells and is intended to clean the well filter and the filter zone of the formation from the mud.

The purpose of the invention is the intensification of the cleaning process by increasing the oscillation frequency of the piston.

The drawing shows the proposed device, a longitudinal section.

The device consists of a cylindrical body open at the bottom! in the lower part of which a piston 2 is mounted, connected by a rod 3 with an additional piston 4, of a smaller diameter. Between the piston 4 and the cover 5 an adjustable spring 6 is installed, resting on the screw 7 and the perceived hydrostatic pressure of the water column in the well, acting from bottom to top on the piston 2.

Inside the housing 1 there is a horizontal partition 8 with a bypass channel 9, dividing the housing 1 into the upper 10 and lower 11 of the camera. In the chambers 10 and 11, flat valves 12 and 13 are installed, interconnected by rods 14 and pressed against the partition 8 by means of springs 15 and 16. Inside the housing 1, a channel 17 is made for supplying compressed air to the upper chamber 10 from a compressor (not shown) located on the surface of the earth, through a hose 18. To exhaust the exhaust air from the lower chamber 11, a discharge channel 19 is made in the housing 1, which is connected to a hose 20 brought to the ground. Channel 17 is connected to the cavity of the elastic chamber 2! located on the side surface of the housing 1. To the housing 1 are attached rods 22 on which a conical reflector 23 is mounted.

The device operates as follows.

The device on the hoses 18 and 20 is lowered into the well and installed in the upper part of the filter pipe. Compressed air is supplied from the compressor unit through a hose 18, which partially enters through a channel 17 into the chamber 21, inflates it and presses it tightly against the surface of the filter pipe (not shown). In this case, the camera 21, which plays the role of a packer, reliably fixes the housing 1 of the device inside the filter pipe and separates the processed section of the filter pipe from the overlying part of the well.

When compressed air enters the upper chamber 10, the differential piston formed by the pistons 2 and 4 moves upward under the action of the compressed air pressure, while the lower spring 16 and compresses. 10 and 11 and blocking the channel 19. When the pressures in the lower 11 and upper 10 chambers are equal, the differential piston moves down, since the area of the piston 2 is larger than the area of the piston 4. At the same time, the valves 12 and 13 move to the lower position, blocking the access of compressed air ha in the passageway 9 and a lower chamber 1! Then the cycle of the reciprocating motion of the differential piston is repeated.

When the reciprocating movement of the piston, which is performed with a frequency of 20-30 Hz and an amplitude of 3-5 mm, the column of water in the filter pipe in the area between the piston 2 and the reflector 23 performs elastic oscillations with the same frequency and amplitude. Under the influence of hydrodynamic loads arising from the vibration of the piston, clay particles and loose deposits that clog the filter section between the piston 2 and the reflector 23 and the filter zone of the aquifer are destroyed, dispersed, and, when subsequently pumped out by airlift, are carried along with the flow of water to the surface of the earth. The presence of a reflector 23 localizes and enhances the action of hydrodynamic loads in a limited area of the filter pipe, which contributes to the intensive process of cleaning the well filter.

The exhaust air passes through the channel 19 and exits to the surface of the earth through the hose 20, without the need for additional energy of compressed air to overcome the hydrostatic pressure. Water column in the well, so the device can be used to clean filters of deep wells.

After processing the upper section of the filter, the hose 18 is disconnected from the compressor, as a result of which air comes out of the chamber 21 and it is again compressed, occupying the position shown in the drawing. The device is lowered to a distance equal to the filter processing interval, and in the above sequence, the next filter section is cleaned. Thus, the well filter is processed along the entire length interval.

The spring 6, before the device is lowered into the well, is adjusted by means of a screw 7 so that its elasticity is balanced by the force of the hydrostatic pressure of the water column in the well, known from the passport of the well, from bottom to top. On the other hand, the forces created by the springs and 16 are directed towards each other and are also balanced . Due to this, an equilibrium system is created in the device. as a result, the oscillations are produced due to the difference in the areas of the lower 2 and upper 4 pistons. Thus, the energy of compressed air in the device is practically not used to overcome the elasticity of the springs, but is mainly used to create an oscillating process that performs useful work, which ensures a high oscillation frequency reaching 20-30 Hz. and a higher degree of purification of well filters, and also increases the efficiency of the device.

Claims (2)

Claim 1. A device for cleaning filters of water wells, containing a hose for supplying compressed air, connected with an open bottom cylindrical body with a spring-loaded piston located on its lower part, placed on a rod mounted on the side surface of the body and connected to the hose for supplying compressed air to an elastic chamber characterized in that, in order to 5 intensify the cleaning process by increasing the oscillation frequency of the piston, it is equipped with an additional piston of a smaller diameter, which is installed in the housing and mounted on top of the rod, 10 by a horizontal partition with a bypass channel dividing the body into two chambers and spring-loaded valves installed on the rods in the holes formed in the horizontal partition 15, with valves installed in each of the chambers and the distance between their working surfaces is greater than the length of the holes in a horizontal partition. 2. The device according to claim 1, from l and more often- 20 by the fact that it is equipped with a hose for discharging exhaust air into the atmosphere, connected to the lower chamber.