RU2282842C1 - Device for sample taking from water pools covered with ice - Google Patents

Abstract

FIELD: hole drilling in ice, particularly to perform microbiological, geochemical and other researches.

SUBSTANCE: sample taking device comprises cable lock for device fastening to carrying cable, cylindrical body, upper and lower heaters, two electromagnetic valves to isolate sample to be taken from ambient medium and biological filter unit. Device is also provided with throttle to reduce pressure of water to be investigated up to value, providing biological filter integrity. The throttle is located between lower electromagnetic valve and biological filter unit. Upper electromagnetic valve may discharge filtered liquid inside body.

EFFECT: increased quality of probe to be taken, reduced power inputs, simplified structure and increased operational reliability.

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Description

The invention relates to the drilling and study of wells in ice and under-ice reservoirs for microbiological, geochemical and other types of research.

A device is known according to the copyright certificate No. 2182225, G 01 N 1/02, publ. BI No. 13, 2002, “Thermoborer sampler”, for sampling ice and water while drilling holes in the ice sheets, as well as for aseptic opening of ice reservoirs with subsequent reliable isolation from the upstream wellbore filled with drilling fluid.

The device consists of a housing, a load-carrying cable, a control unit, a sensor system, a heat core and a heat needle. The disadvantage of this device is the complexity of the design of the sampler, insufficiently reliable sampling technology, as well as the low quality of the sample being taken, since the sample is taken from water that pre-fills the lower horizons of the well where it is frozen.

It is also known device adopted for the prototype, according to the patent No. 2244913, G 01 N 1/10, publ. B.I. No.2, 01.20.2005, "Device for sampling from ice bodies of water" for aseptic sampling of water for subsequent microbiological analysis.

A device for sampling, including a cylindrical body, upper and lower heaters, a cable lock for mounting it on a load-carrying cable, a pump for pumping water, two electromagnetic valves for isolating the sample from the environment, according to the invention, has a special unit including a set of parallel-connected cassettes with microbiological filters, and the diameters of the cassettes are different (D <D + Δ) and increase towards the bottom of the block.

The disadvantage of this device is its high energy consumption and lack of reliability: the use of an electric pump for pumping ice water, firstly, causes significant voltage losses in the multi-kilometer conductive line and, secondly, is unreliable, since ice water falling into the internal cavities of the pump motor can to be contaminated with extraneous microflora due to the complexity of their sterilization.

The technical result is the elimination of these disadvantages, that is, improving the reliability of the device, improving the quality of the sample taken, simplifying the design of the device and reducing energy consumption.

The technical result is achieved by the fact that a device for sampling from ice bodies of water, including a cable lock, a cylindrical body, upper and lower heaters, two solenoid valves for isolating the sample from the environment, a biological filter unit according to the invention is equipped with a throttle to reduce the pressure of the test water to a value that ensures the integrity of biological filters located between the lower solenoid valve and the filter unit, and the upper solenoid valve ying to discharge the filtered fluid in the body cavity.

A device for sampling from under-ice reservoirs is illustrated in the drawing.

The device comprises: a cylindrical housing 1, in which the upper 2 and lower 3 heaters are mounted, the electrical connector block 6, the biological filter unit 7, the throttle 8, which serves to reduce the pressure of the test water to a pressure of about 0.1 MPa, necessary to maintain the integrity of the biological filter , and the body cavity 9. The filter unit is insulated by electromagnetic valves 10. The device is mounted using a cable lock 5 on a load-bearing cable 4. The device operates as follows. After a well has passed through the ice stratum and a borehole has opened an ice body, a certain part of the water rises into the well until the pressure in the body of water is equal to the column of liquid being poured into the well. Then, a sampling device with a pre-sterilized filter unit 7 is lowered through the well into the reservoir under investigation by means of a load-carrying cable 4. Since water rising into the well can freeze on the walls of the well during tripping operations, the device is lowered with the lower heater turned on 3. At a given depth, the electromagnetic valves 10 are opened, and the test water through the throttle 8 enters the filter unit 7 and then into the internal cavity of the housing 9. The throttle 8 is located ny between the lower solenoid valve 10 and the unit 7 reduces the pressure to a value which ensures the integrity of biological filter unit 7. The filtering process ice water continues until the pressure within the housing and in the reservoir to equalize. Next, the solenoid valves 10 are closed, and the device is removed from the well. The absence of a pump in the sampler significantly reduces the likelihood of contamination of the test water when it passes through the pump cavity and significantly reduces the energy consumption during operation of the device.

When lifting the device, the upper heater 2 is turned on, which calibrates the well in case of freezing of the water that has risen from the under-ice reservoir to the lower part of the well. After removing the device from the well, a filter unit 7 is removed from it (together with the electromagnetic valves 10 in the closed position) and transferred for examination.

As a result, when the device is operating, all conditions are met to ensure sterile sampling and the device design is greatly simplified.

Claims (1)

A device for sampling from under-ice reservoirs, including a cable lock for mounting it on a load-carrying cable, a cylindrical body, upper and lower heaters, two electromagnetic valves for isolating the sample from the environment, a biological filter unit, characterized in that it is equipped with a throttle to reduce pressure of the test water to a value that ensures the integrity of biological filters located between the lower solenoid valve and the biological filter unit, and the upper electromagnet pleasing valve configured to release the filtered liquid into the body cavity.