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Sampling device for free hydrocarbon flux of soil

A sampling device and free hydrocarbon technology, applied in the field of oil and gas geochemical exploration, can solve the problems of affecting the authenticity of the measurement results, destroying the state of the natural environment, and small area, so as to simplify the combination and process, improve the integration level, and flexibly expand Effect

Inactive Publication Date: 2020-01-31
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the static box method has a very prominent problem, that is, in order to destroy the natural environment state on the measured plot, the turbulence state in the box and the temperature, humidity, light, radiation conditions, etc. Affect the authenticity of the measurement results; Another problem is that due to the large spatial inhomogeneity of gas emissions such as methane, the area directly measured by the box method is very small

Method used

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  • Sampling device for free hydrocarbon flux of soil
  • Sampling device for free hydrocarbon flux of soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Field adsorption sampling and direct sampling

[0032] 1. Locate to the required sampling point, take out the constant volume cavity 5 of the flux box, turn on the environmental sensor 4, observe the data through the display screen 9, and record the temperature, humidity and air pressure data during sampling;

[0033] 2. Hold the handle 1 and drill the constant volume cavity 5 of the flux box into the formation using the threaded drill hole at the bottom until the constant volume sealing ring 6 is positioned;

[0034] 3. Take out the pre-activated adsorption tube, connect the atmospheric sampler and the adsorption tube to the expansion interface 2 for adsorption sampling, the typical gas flow rate is 0.5L / min, and the collection time is 20min. After the sampling is completed, close the atmospheric sampler and put The adsorption tube is sealed and stored;

[0035] 4. Take 10mL free air sample through the sampling port of the syringe, and inject it into the sample bottle...

Embodiment 2

[0037] in situ extension assay

[0038] 1. Locate to the required sampling point, take out the constant volume cavity 5 of the flux box, turn on the environmental sensor 4, observe the data through the display screen 9, and record the temperature, humidity and air pressure data during sampling;

[0039] 2. Take out the in-situ detector (infrared, portable gas chromatography) and connect it to the expansion interface 2, and fix it through the expansion slot 3;

[0040] 3. Carry out in-situ hydrocarbon concentration detection and record the detection concentration.

[0041] In summary, the beneficial effects of the present invention are:

[0042] 1. High integration and portability, the main body is made of high-strength aviation aluminum alloy, light in weight, and can be carried and operated by a single person in the field. The handle and lower part are sealed and the thread can directly drill the flux box into the formation and ensure a certain degree of sealing;

[0043] 2...

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Abstract

The invention provides a sampling device for free hydrocarbon flux of soil. The sampling device comprises a flux chamber constant volume cavity, an environmental sensor, an expansion interface and a constant volume sealing ring, wherein an open architecture is formed below the flux chamber constant volume cavity; the environmental sensor is arranged inside the flux chamber constant volume cavity;the expansion interface is arranged outside and above the flux chamber constant volume cavity and is connected with the environmental sensor; and the constant volume sealing ring is arranged outside and below the flux chamber constant volume cavity, the constant volume sealing ring is used for guaranteeing internal capacity of the flux chamber constant volume cavity to be a predetermined value when the flux chamber constant volume cavity drills in a stratum. The invention designs a soil hydrocarbon gas flux sampling and in situ detection front-end device applicable to different surface environments and lithological properties, and the device has the advantages of portability, durability, flexible standardized interface and strong expandability, so that the original sampling tool combination and flow are simplified, and integration level is improved. Therefore, a practical means is provided for realization of field soil hydrocarbon gas flux sampling and in situ detection which can be operated by a single person.

Description

technical field [0001] The invention relates to the field of oil and gas geochemical exploration. Background technique [0002] Geochemical surface exploration is based on the direct detection of hydrocarbon fluids. However, whether the determination of light hydrocarbon content has the integrity of real information has always been one of the key issues discussed by the exploration community. As far as technology is concerned, the determination of a time point puts forward higher requirements for the content and detection limit. With the development of technology, the method of deriving surface gas emission flux by measuring the turbulent conditions near the surface and the concentration changes of trace gases has emerged. The gas transport flux measured by this method at a certain height can represent the surface gas emission flux. Foreign researchers have carried out relatively comprehensive research and established the closed box method, which is used for the study of s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/24G01N21/3504G01N30/02G01N27/62
CPCG01N1/24G01N21/3504G01N30/02G01N27/62
Inventor 高俊阳杨帆卢丽许科伟黄欣顾磊汤玉平
Owner CHINA PETROLEUM & CHEM CORP