RU2650515C1 - Method of regeneration of water wells - Google Patents

Abstract

FIELD: mining.

SUBSTANCE: invention relates to the operation of groundwater abstractions, vertical drainages to protect areas from flooding, systems for flooding, systems for the replenishment of underground water reserves through closed infiltration facilities, in particular the regeneration of water wells for mechanical and biological colmatation. Method consists in sealing the well with a plug at a depth below the static level of the water, and then holding it for 3 to 6 months. After aging and death of the biological colmatant, the inner surface of the wellbore and the filter are cleaned, followed by evacuation of the pulp. Pumping of pulp is made with a pumping unit with rubberized blades. Well is then maintained for a period of 7–14 days in a calm state. After holding this time, water flows stabilize and the dead biological colmatant is washed out of the filter zone.

EFFECT: simplification is provided, the possibility of placing a mechanical plug at a depth below the static level, and removing the residual colmatage from the filter zone of the well.

1 cl, 1 dwg

Description

The invention relates to the operation of groundwater intakes, vertical drains, to protect territories from flooding, systems for flooding, systems for replenishing groundwater through closed infiltration facilities, in particular, regeneration of water wells during mechanical and biological mudding.

During the operation of wells, a decrease in their flow rate may occur. This is caused by several reasons: the capacity of the aquifer decreases, the filter of the wells and the filter zone become muddy.

There are three ways to destroy biological colmatations: temperature mode - cooling, heating (this method is expensive and time-consuming); the destruction of the nutrient medium is a reagent method (see N. Plotnikov, Design and operation of groundwater intakes. - M.: Stroyizdat, 1990. - 255 p.).

The disadvantages of this method are the use of chemicals; destruction of filter elements as a result of chemical corrosion; aquifer contamination with chemical reagents and their reaction products; the need for a reagent farm and special equipment for the manufacture and disposal of technological solutions.

The closest is the method of regeneration of a well into water (Pat. 2318965 RF, IPC EV 03/15, publ. 10.03.2008).

The disadvantage of this method is the difficulty, the inability to place the pneumatic plug at the required depth below the static level, low efficiency due to residual clogging in the filter zone of the well.

The technical problem to which the invention is directed is the simplification, the ability to place a mechanical plug at a depth below the static level and remove residual clogging from the filter zone of the well.

The technical problem is solved as follows, well regeneration into water is carried out in several stages.

First, we install a mechanical plug in the wellbore below a static level with its subsequent exposure for a period of 3 to 6 months, after exposure and dying of biological colmatant, the inner surface of the wellbore and the filter are cleaned, followed by pumping out pulp. The pulp is pumped out by a pumping unit with rubberized blades, then the well is aged for 7-14 days in a calm state. After holding this time, water flows are stabilized and the dead biological colmatant is washed out from the filter zone.

The installation location of the mechanical plug in the borehole is illustrated by the drawing of Figure 1. It shows the installation diagram of a mechanical plug. The drawing shows: casing (1), static water level (2), mechanical plug (3), cable (4).

The method is as follows, water pipes with pumping equipment are removed from the well. Then, a mechanical plug 3 on the cable 4 is lowered into the casing 1 of the well. Under the influence of weight, the mechanical plug 3 is set to a depth below the static water level 2, the mechanical plug 3 is tightly attached to the inner walls of the casing 1 of the well and does not allow oxygen to enter the atmosphere from the water located below the installed mechanical plug 3. The mechanical plug is aged from 3 to 6 months. Colmatization can be chemical, mechanical and biological. Biological colmatant are aerobic bacteria vital products, the existence of which requires the presence of oxygen in the environment. After installing a mechanical plug, after a specified time, aerobic bacteria consume all the oxygen in the water. Since its additional access is blocked by a mechanical plug 3, aerobic bacteria die and, consequently, the destruction of biological colmatant. The mechanical plug 3 is removed from the casing 1.

After that, a unit for cleaning the inner surface of the wellbore and filter is lowered into the well, including a pumping unit and a system of tubes for hydraulic agitation and flushing of sediments and fouling. The valve on the pressure pipe is closed. The pump is turned on, water enters the pipes by flushing and stirring up the sludge, thereby cleaning the inner surface of the casing 1 of the well from fouling and sludge in the sump of the well is stirred up. After erosion and agitation of sediments and fouling, the valve on the pressure pipe opens and the pulp is pumped out from the agitation zone. Then, the pump unit is turned off and removed from the wellbore. After that, the well is maintained for a period of 7-14 days in a calm state. During this time, the stabilization of water flows and the erosion of the dead biological colmatant from the filter zone. Upon completion of stabilization of the flows, operational pumping equipment with lifting pipes is installed. The well is put into production.

Claims (1)

A method of regenerating wells into water, which consists in sealing the well with a plug at a depth below the static water level, followed by holding it for 3 to 6 months, characterized in that after holding and dying off the biological mud, the inner surface of the wellbore and the filter are cleaned, followed by pumping out pulp, the pulp is pumped out by a pump unit with rubberized blades, then the well is aged for 7-14 days in a calm state, after holding this time a hundred the stabilization of water flows and the washing away of dead biological mud from the filter zone.

Images