U-shaped pipe underground fluid multilayer sampling device

Abstract

The invention provides a U-shaped pipe underground fluid multilayer sampling device. The U-shaped pipe underground fluid multilayer sampling device comprises a ground auxiliary system, a supporting system, a gas getting unit, water getting units and interlayer packers. The gas getting unit, the water getting units and the packers are arranged on a supporting connection rod of the supporting system. The gas getting unit is arranged in an aeration zone above a water table, the water getting units are arranged below the water table, the packers are mixed with the gas getting unit and the water getting units, waterpower incontinuity of upper parts and lower parts of sampling units in sampling layers of different aquifers or the same aquifer is achieved, and underwater of the different aquifers is sealed and cannot be mutually disturbed by drilled channels. The U-shaped pipe underground fluid multilayer sampling device is simple and novel in structural design and free of starting pressure, the service life of equipment is prolonged, the sample introduction speed is increased, the cost is reduced, and the application range is wider.

Description

technical field [0001] The invention relates to the technical field of underground fluid environment monitoring, in particular to a U-shaped tube underground fluid multi-layer sampling device, which is suitable for layered high-precision sampling of underground fluid. Background technique [0002] In 2014, more than 200 cities across the country carried out groundwater quality monitoring work. According to the "Groundwater Quality Standard" (GB / T14848-93), the monitoring points with poor water quality accounted for 45.4%, and the extremely poor monitoring points reached 16.1%. Groundwater pollution has become a very serious problem affecting people's life and health and urban construction in our country. In addition to routine water quality monitoring of water sources, relevant industrial and mining enterprises, landfills, and gas stations all need to regularly monitor groundwater quality to detect and eliminate possible environmental risks in a timely manner. In addition, ...

AI Technical Summary

Problems solved by technology

However, there are still some technical difficulties that cannot be completely overcome: (1) The depth of application is limited, limited by the pressure resistance of plastic materials and pneumatic joints, and the application range generally does not exceed -30m; (2) Because the liquid phase check valve cannot be compared It is well adapted to the underground fluid environment with a lot of sediment content, silting may occur, and once the one-way valve fails, the sampling of the entire layer will fail; (3) The liquid-phase one-way valve has a starting pressure, so it can only be dived underground When the check valve is shallow below the liquid level and has not yet reached the starting pressure condition, sampling will not be possible; (4) The liquid phase check valve has reverse conduction pressure, that is, when the sampling pressure is too high, the check valve will be damaged ; (5) interlayer water or long-term residual fluid in the wellbore mixed into the sample, resulting in the loss of representativeness of the subsurface fluid samples taken on the ground

(6) A large amount of drilling fluid remains in the wellbore or in the cavity of the sampling section, making it difficult to discharge the drilling fluid, and the influence of the drilling fluid cannot be eliminated for a long time after the monitoring well is installed

The above-mentioned technical difficulties will lead to the inability to take deeper representative water samples, or the increase of sampling depth will greatly increase the sampling cost, and the underground fluid will be polluted during the sampling process, which cannot guarantee the fidelity of the sample and other basic requirements.

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