RU2394220C2 - Device for collecting gas samples from soil - Google Patents

Abstract

FIELD: physics.

SUBSTANCE: sample collector has a filter-sampling apparatus which is put into a borehole and a two-way pump with suction and blowing valves. The suction and blowing valves are connected through socket pieces and delivery pipes to the filter-sampling apparatus and a tank with a water sample placed in a bath filled with water, respectively.

EFFECT: simple design of the sample collector and collection of gas samples in the subsurface layer without extracting soil.

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Description

The invention relates to geochemical methods for the search for hydrocarbon raw materials and products of emanations of natural radioactive series and can find application in the study of oil-prospective areas and in the localization of gas leakage areas from natural gas storages.

A device for sampling gas, which has a container with a lid, a cylinder with a hole punch, a fitting, a device for loading a selected sample. The device is equipped with a gas chromatograph (patent No. 2313075, IPC G01 N 1/22, published on December 20, 2007).

In the known device, both sampling and analysis are performed at the same time, and the natural gas content in the soil sample is determined without taking into account technogenic contamination and decomposition products of soil microorganisms. The device itself has a complex structure, significant weight and low productivity.

The closest technical solution is a gas sampler, in which at one end there is a lid with a fitting and a sampling funnel fixed to it. At the other end of the column there is also a fitting with a protective umbrella mounted on it. The intake funnel and protective umbrella are removable (patent No. 2055340, published 02.27.1996). However, in the known device, before adsorbing the next sample in the funnel, the adsorbent is replaced, and when the selected sample is taken from the funnel for storage, a partial leakage of the gas component of the soil sample is inevitable . All this complicates the sampling process and reduces the quality and efficiency of work.

The purpose of the invention is to simplify the design for mass testing, sampling gas in the subsurface layer without removing soil.

This goal is achieved in that, in contrast to the prototype, the device contains a two-way pump connected to a gas sampling filter and a storage tank with a water plug for the suction gas, which is located in a cuvette with water.

The device is shown in the drawing and consists of a filter sampler - 1, a two-sided pump - 2, a cuvette with water - 3, discharge tubes - 4, water bottles - 5, suction - 6 and discharge - 7 valves. The installation is lowered into the hole - 9, prepared in the ground - 8.

The main element of the installation is an aluminum tube with a diameter of one inch and a length of one meter, the lower end of which ends with a conical plug. The tube to a height of 0.4-0.5 m over the entire surface is drilled with a series of holes with a diameter of 3.0-4.0 mm in increments between the holes - 1/4 of the circumference of the tube. A wire with a diameter of 1.5-2.0 mm is wound around the entire height of the drilled part of the tube; a filter thereby protecting the internal cavity of the tube from particles of the soil being studied is 8. The upper end of the tube is sealed with a rubber stopper with an exhaust pipe with a diameter of 0.5-0.6 mm, which is sealed with an outlet rubber tube-4 1.5 m long.

The second element of the installation is a pressure-suction pump - 2 with two ball-type valves - 6 and 7, tightly rubbed to the suction - 6 and discharge - 7 pump nozzle sockets. A tube - 4, coming from the filter, is tightly mounted on the suction fitting. A rubber tube - 4, the second end of which is put on a through fitting in a rubber stopper, which, in turn, is sealed with an ordinary half-liter glass bottle - 5, filled 3/4 with "clean" water, is also put on the injection nozzle.

Sampling is carried out in the following order: an ordinary crowbar with a diameter corresponding to the diameter of the filter punches a hole - 9 with a depth of not less than the height of the filter and not more than 0.8 of the entire length of the suction pipe, the filter is pushed into the hole, after which the mouth of the hole is carefully packed and sealed, preventing air flow through the walls of the hole into the cavity of the intake pipe at the time of suction; the bottle, filled 3/4 of the volume with water, is sealed with a rubber stopper with a through fitting connected to the rubber tube of the discharge valve; the bottle is lowered into the cuvette - 3 with water upside down at an inclination angle of 30-45 degrees, the pump performs 3-4 suction-discharge cycles, after which the bottle is released from the cork with the nozzle with the delivery tube under water, the neck of the bottle is briefly covered with a finger, after which the bottle is clogged with a blank rubber stopper; in the upside down position, the bottle is removed from the cuvette, marked with the label with the sample number and inverted position is installed in the transported container for delivery to the laboratory center, the water from the cuvette is drained into a plastic canister, the unit is disassembled to move to another point.

Installation details are made of oxidation-resistant material, after a shift cycle, the installation must be disassembled and thoroughly wiped dry.

A copy of the installation made by the author was tested on Korinsky oil production area in the Republic of North Ossetia-Alania. Several hundred samples were successfully selected, in dozens of which laboratory analysis recorded an abnormal methane content.

The installation eliminates the influence on the sample of technogenic pollution and decomposition products of microorganisms in the soil layer, and also allows long-term storage of samples.

Claims (1)

A gas sampler from the soil, containing a filter sampler located in the hole, a two-way pump with suction and discharge valves, characterized in that the suction and discharge valves are connected via fittings and discharge pipes, respectively, to the filter sampler and the accumulator with a water plug placed in a cuvette filled with water.

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