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Preparation method of light hydrocarbons in rocks

A technology for light hydrocarbons and rocks, which is applied in the field of preparation of light hydrocarbons in rocks, and can solve problems such as the inability to retain light hydrocarbon components

Inactive Publication Date: 2017-04-26
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention aims at overcoming the problem in the background technology that the separation and preparation of organic matter in existing rocks cannot retain light hydrocarbon components dissolved in chloroform due to their volatility under normal pressure, and provides a method for preparing light hydrocarbons in rocks

Method used

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  • Preparation method of light hydrocarbons in rocks

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Embodiment 1

[0020] Use a jaw crusher to crush the rock sample to a particle size of 10mm, then mix the crushed rock particles with chloroform, put the mixture into a closed powder sample pool, and use an impact crusher to crush it to a rock powder slurry with a particle size of 0.18mm The upper cover of the powder sample cell is fastened and sealed with bolts, and there is a gas-taking pinhole sealed with a silica gel pad on the cover of the powder sample cell. After the powder sample is finished, the light hydrocarbon gas components are extracted immediately, and then frozen and sealed. Put the powder sample pool at -60°C, unscrew the fastening bolts of the powder sample pool cover after freezing, transfer the low-temperature slurry to a pressurized filter, filter under pressure, and use a -60°C low-temperature container to accept the light component. Organic matter solution (filtrate). Then rectify the organic matter solution, and use a low-temperature collector at -60°C to receive ligh...

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Abstract

The invention relates to a preparation method of light hydrocarbons in rocks, and solves the problem that during the separation process of organic substances in rocks, due to the volatility of light hydrocarbons under a normal pressure, light hydrocarbons cannot be dissolved in chloroform. The preparation method comprises the following steps: (1) grinding rocks in an organic solvent mixture with a high boiling point in an enclosed space, carrying out extraction, extracting gaseous light hydrocarbons, and then freezing the extracted mixture at a low temperature; (2) transferring the frozen extracted mixture into a pressurized filter, supplying a constant pressure to the interior of the filter, discharging the extract after the extract is filtered by a filtering layer, and receiving the filtrate by a low temperature freezing device; and (3) rectifying the filtrate obtained in the step (2) obtained by filtering the extract by the filtering layer, collecting the light hydrocarbon fraction at a low temperature, and finally obtaining light hydrocarbons from gas to liquid. The provided method can completely retain the light hydrocarbons during the separation process and preparation of organic substance samples; provides samples for the research on new indexes of organic geochemistry, and is safe and environment-friendly.

Description

technical field [0001] The invention relates to the technical field of organic geochemistry for oil and gas exploration and development, in particular to a method for preparing light hydrocarbons in rocks. Background technique [0002] At present, in the organic geochemical research of oil and gas exploration and development, the commonly used method of extraction and separation of soluble organic matter in rocks is to crush the rocks with a jaw crusher to particles with a diameter of 10 mm, and then use an impact crusher to further crush the rock particles. Rock powder crushed to a particle size of 0.18mm. Weigh 200g of rock powder and use Soxhlet extractor to extract soluble organic matter under normal pressure with chloroform as a solvent. The organic matter solution obtained after extraction is concentrated and dried, and the organic matter obtained is called chloroform pitch "A ". Using this method to separate and extract soluble organic matter in rocks, chloroform bi...

Claims

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Application Information

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IPC IPC(8): G01N1/28G01N1/34G01N1/42
CPCG01N1/286G01N1/34G01N1/42
Inventor 吴志峰郭伟吴雪姣白树庆
Owner PETROCHINA CO LTD
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