RU2561398C1 - Construction of monitoring geoecological well for air sampling - Google Patents

Abstract

FIELD: ecology.

SUBSTANCE: construction of monitoring geoecological well for air sampling is proposed, comprising a perforated casing string with a flange. At that the perforated casing string with a flange is wrapped with a geofabric and has a perforated tube of small section. In addition, the construction of the well comprises a sealed lid with a ball valve attached in it, which flow cross-section corresponds to the diameter of the measurement snout of the sampling probe.

EFFECT: creation of a simple universal structure of monitoring geo-ecological well.

2 dwg

Description

The invention relates to the field of ecology and is planned for use for sampling air from the soil in places of underground passages of gas pipelines under water and other barriers, at locations of underground gas storages, tanks, etc.

Currently, the following designs of observation geo-ecological wells are used for sampling air and water:

- deep multi-interval observing geoecological wells;

- observation geoecological wells for “spot” sampling of small samples using so-called minifilters [1] (http //: msd.com.ua, article “Well equipment and instruments for sampling”).

The design of deep multi-interval observing geo-ecological wells is a well, divided by concrete or clay castles into the studied intervals. Each interval is equipped with a perforated tube for sampling. Tubes from each interval come to the surface and are closed with safety caps.

The closest in technical essence and the achieved result to the claimed design of the observational geoecological well for air sampling is the design of the observational geoecological well for "point" sampling of small samples using the so-called minifilters. A carrier pipe with such minifilters is installed in a well that has been drilled. With a small diameter of the well, it is possible to lower the carrier pipe directly into it. Around the minifilters the filter dust is laid and the areas between them are cemented. For guaranteed operation of the mini-filters it is advisable to install them in a double pipe. Sampling from minifilters is performed from the surface with a vacuum pump. Such a well design is in essence closest to the design of the observation geoecological well proposed in the application.

The disadvantage of the above structures is their complexity and the high cost of construction. In some cases, it is advisable to use simpler designs.

The aim of the invention is to create a simple universal design of the observation geoecological well, suitable for monitoring air from the ground at the underground passages of gas pipelines under water and other barriers, at the locations of underground gas storages and tanks. The depth of such wells, as a rule, does not exceed 4 m.

The essence of the invention lies in the fact that the claimed design of an observation geo-ecological well for sampling air, including a perforated casing with a flange, which according to the invention is wrapped with a geo-fabric, has a perforated tube of small cross section, an airtight cover with a ball valve mounted on it, the passage section of which corresponds to the diameter of the measured (with depth marks) proboscis of the sampler.

In FIG. 1 shows the design of an observational geoecological well for air sampling, where:

1 - perforated casing with a flange;

2 - geo-fabric;

3 - perforated tube of small cross section;

4 - gasket;

5 - cover;

6 - ball valve;

7 - a protective cap.

In FIG. 2 shows the moment of sampling, where:

8 - dimensional proboscis of the sampler (proboscis has depth marks, which are not shown in Fig. 2).

A pre-drilled well is installed with a perforated casing string with a flange 1, wrapped with geo-fabric 2, and with a small perforated tube 3 installed in it. A cover 5 is attached to the flange through a sealing gasket 4, on which a ball valve 6 with a protective cap 7 is installed.

The inventive design works as follows.

Air from the soil through the geofabric 2, which provides air filtration without soil particles, enters the perforated casing with a flange 1, where a gaseous medium corresponding to the gaseous medium of the soil is formed. To take a sample, the protective cap 7 is removed from the ball valve 6 and the proboscis of the sampler 8 is lowered into the ball valve 6. The ball valve 6 is opened and the measured proboscis of the sampler 8 is lowered to a predetermined depth, the diameter of which corresponds to the passage section of the ball valve 6. This condition is necessary to prevent mixing gas environment in the well with the external environment. A small perforated tube 3 prevents mixing of the gas medium (inside the well) at the time of lowering the proboscis of the sampler, and its perforation does not interfere with sampling from a given depth. Next, using a vacuum sampler, a sample is taken.

The proposed design of an observing geo-ecological well for sampling air provides for the selection of high-quality samples from specified depths and should be used to control air from the ground at the underground passages of gas pipelines under water and other obstacles, at the locations of underground gas storages and tanks.

The material of the pipes used in the design of the observation geoecological well for air sampling should not contribute to the development of metabolic processes (adsorption, chemical or biological catalysis), leading to a noticeable change in the composition of the sample. From this point of view, caution should be exercised in the use of steel pipes, giving preference to pipes made of synthetic materials.

Information sources

1. http //: msd.com.ua, article “Well equipment and sampling devices”.

Claims (1)

The design of the observation geoecological well for air sampling, including a perforated casing with a flange, characterized in that the perforated casing with a flange is wrapped with a geo-fabric, has a small perforated tube, an airtight cover with a ball valve mounted on it, the passage section of which corresponds to the diameter dimensional (with depth marks) proboscis of the sampler.

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