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Method and device for multi-layer sampling of gas and water in drill hole

A technology for drilling and drilling pipes, which is applied in the field of gas-water multi-layer sampling in boreholes and devices for gas-water multi-layer sampling in boreholes. It can solve the problems of high production cost and complex structure, and achieve low cost and high sampling Ease of operation and cost reduction

Inactive Publication Date: 2019-07-16
INST OF ROCK & SOIL MECHANICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the sampling device is simple in principle, it is mainly aimed at high-fidelity sampling of deep formation fluids with heat preservation and pressure. Therefore, the structure is relatively complicated and the production cost of the device is relatively high.

Method used

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  • Method and device for multi-layer sampling of gas and water in drill hole
  • Method and device for multi-layer sampling of gas and water in drill hole

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Embodiment Construction

[0034] Below in conjunction with accompanying drawing and implementation example the present invention is further described:

[0035] A gas-water multi-layer sampling method in a borehole, the steps are:

[0036] 1. Lower the water pump 3 and the packer 2 to the layer specified in the borehole 1 where gas-water samples need to be obtained;

[0037] 2. Turn on the nitrogen cylinder 8, adjust the decompression valve 9, and inject nitrogen gas into the packer 2 through the setting pipe 7. The nitrogen pressure is about 2 MPa higher than the hydrostatic pressure of the formation to realize the setting of the packer 2;

[0038] 3. Turn on the power supply 6. Turn on the pump 3, and the gas and water in the formation enter the gas-water separation device 10 through the first drill pipe 41 and the second drill pipe 42, so that the gas enters from the upper outlet 13 of the gas-water separation device 10 Gas sampling bag 11, water enters water sampling bottle 12 from lower outlet 14 ...

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Abstract

The invention discloses a method and device for multi-layer sampling of gas and water in a drill hole. The method comprises the following steps of: A, putting a water suction pump and a packer in a specified layer position in the drill hole; B, opening a nitrogen cylinder, adjusting a pressure reducing valve, injecting nitrogen into the packer through a setting pipe, and realizing setting of the packer; C, switching on a power supply, and starting the water suction pump for sampling; D, after sampling, switching off the power supply, turning off the water suction pump, and releasing nitrogen in the packer to realize deblocking of the packer; and E, lifting the packer and the water suction pump to the depth, and carrying out gas and water multi-layer sampling at the inner layer position ofthe drill hole. The water suction pump is connected with the packer through a drill rod, a water suction pump cable penetrates through the packer and is connected with the power supply; the packer isconnected with the pressure reducing valve and the nitrogen cylinder through the setting pipe, the packer is connected with a gas and water separation device through the drill rod; an upper outlet isconnected with a gas sampling bag; and a lower outlet is connected with a water sampling bottle. The device has the advantages of simple principle, clear structure, low cost, convenience in installation, simplicity and convenience in sampling, accurate and credible result and good application prospect.

Description

technical field [0001] The invention relates to the field of deep formation fluid sampling, more specifically to a method for sampling gas and water in a borehole, and also to a device for sampling gas and water in a borehole. The method and device can be widely used in deep formation water and gas sampling analysis and research in the processes of underground engineering survey and construction, deep hydrogeological investigation and the like. Background technique [0002] Deep formations not only contain groundwater, but also may contain gases, such as CH 4 , CO 2 、H 2 S et al. The existence of gas has a great influence on the construction of some underground projects. For example, in tunnel engineering, if the stratum through which the tunnel passes contains high pressure or toxic gases, specific measures need to be taken during the construction process to ensure the smooth progress of the construction. Therefore, when carrying out underground engineering constructio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/08E21B43/34
CPCE21B43/34E21B49/081
Inventor 方志明李小春
Owner INST OF ROCK & SOIL MECHANICS CHINESE ACAD OF SCI
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