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Soil adsorbed hydrocarbon low-temperature desorption apparatus and method

A desorption and soil technology, applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve problems such as poor reproducibility, low desorption efficiency, and influence on oil and gas distribution prediction

Active Publication Date: 2005-09-14
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

Its main disadvantage lies in the desorption efficiency. If the temperature is low, there will be little gas released without stirring, and the reproducibility is poor; if the temperature is raised, pyrolysis will occur again.
Although the hydrogen stripping technology realizes stirring at relatively low temperature, it can usually only detect high-intensity seepage anomalies related to faults. The reason is that the desorption efficiency at normal pressure (1atm) is low and low Intensity micro-seepage anomalies, thus affecting the prediction of oil and gas distribution
[0004] The above analysis shows that soil adsorption of hydrocarbons is the top priority in oil and gas geochemical exploration, but there are major problems in the partial extraction devices and methods of soil adsorption hydrocarbons

Method used

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Embodiment Construction

[0022] Figure 1-3 is a schematic diagram of a low-temperature desorption device for soil adsorbed hydrocarbons, which can quantitatively desorb soil adsorbed hydrocarbons under low temperature and pressure conditions. It is made of condensation pipe 13, flask 17, funnel 19, vacuum pump 12 and water bath 16. Wherein, the condensation pipe 13 is connected with the scale pipe 6 and the vacuum pump 12 through a tee, and a valve 5 is provided at the connecting end of the tee and the vacuum pump 12; 25, the glass pipe 25 has four outlets, each outlet end is provided with a valve 1, 2, 3 and 4; the lower end of the funnel 19 is connected with the glass pipe 25 through the valve 2, and the airless water tank 7 passes through the latex pipe 21 Connect with the valve 3 and the glass pipe 25; the upper end of the scale tube 6 is a gas sampling port, the sampling port is tightly covered with a rubber stopper 10, and the condenser pipe 13, the flask 17, the funnel 19, the glass pipe 25 and...

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Abstract

The invention relates to a soil adsorbed hydrocarbons cryogenic temperature desorption apparatus and its method.The method comprises following steps: injecting water without gas into the apparatus; mixing water and soil to mud absorbed into the apparatus; then injecting water without gas and adjusting temperature head to normal temperature and normal pressure; collecting desorption gas sample and detecting them in gas-chromatography.

Description

technical field [0001] The invention relates to a new technology in oil and gas geochemical exploration, in particular to a partial extraction device and method for soil adsorption hydrocarbon measurement. technical background [0002] Oil and gas geochemical prospecting is a cheap and rapid exploration method to determine the location of underground oil and gas reservoirs through surface survey, which belongs to an unconventional exploration method. Light hydrocarbons (CH 4 ~C 4 h 10 ) is the most important index in oil and gas geochemical prospecting, and it is also an important basis for further research and development of indirect indexes. [0003] There are three forms of light hydrocarbons in soil: free hydrocarbons in soil gas, soil adsorbed hydrocarbons and soil occluded hydrocarbons. The acid hydrolysis method analyzes soil occluded hydrocarbons. The test data is strongly disturbed by changes in the content of carbonate minerals in the soil, and it cannot be use...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02G01N30/06
Inventor 张刘平
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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