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Method for identifying natural gas causes by using relative contents of cis-1, 3-dimethylcyclohexane, normal octane and 2-methylheptane

A technology for the relative content of dimethylcyclohexane, which is applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of lack of oil-type gas causes and sources, and the lack of research on C8 light hydrocarbon compounds, etc., to achieve rapid and accurate judgment effect of consciousness

Pending Publication Date: 2022-03-18
PETROCHINA CO LTD
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  • Claims
  • Application Information

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Problems solved by technology

At present, the research on light hydrocarbons in natural gas has become a hot spot in the field of oil and gas geology. The composition of C5-C7 light hydrocarbons has been widely used in oil and gas exploration and geological research, while the research on C8 light hydrocarbon compounds is relatively less, and the use of C8 light hydrocarbon parameters to judge is lacking. Method for understanding the origin and source of coal-derived gas and oil-type gas

Method used

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  • Method for identifying natural gas causes by using relative contents of cis-1, 3-dimethylcyclohexane, normal octane and 2-methylheptane
  • Method for identifying natural gas causes by using relative contents of cis-1, 3-dimethylcyclohexane, normal octane and 2-methylheptane
  • Method for identifying natural gas causes by using relative contents of cis-1, 3-dimethylcyclohexane, normal octane and 2-methylheptane

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Embodiment 1

[0038] This embodiment provides a method for identifying the origin of natural gas by using the relative content of cis-1,3-dimethylcyclohexane, n-octane and 2-methylheptane, wherein the process flow chart of the method Such as figure 1shown, from figure 1 It can be seen that it includes the following specific steps:

[0039] Select stainless steel high-pressure steel cylinders with double valves to collect or select existing typical marine oil-type gas, coal-derived gas samples from continental coal-measure strata, and natural gas samples to be tested in the research area. Before sampling, the stainless steel high-pressure cylinders are vacuumed to 10 -1 Pa;

[0040] During the sampling process, the stainless steel high-pressure cylinder with double valves is connected to the valve of the natural gas well to be collected through the connecting pipeline and the pressure reducing valve, and the cylinder is repeatedly washed with high-pressure natural gas at the wellhead for 3...

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Abstract

The invention provides a method for identifying natural gas causes by using relative contents of cis-1, 3-dimethylcyclohexane, n-octane and 2-methylheptane, which comprises the following steps: respectively carrying out C8 light hydrocarbon component analysis on typical marine facies strata oil type gas and continental facies coal measure strata coal gas samples by using gas chromatography to obtain C8 light hydrocarbon component content data in the samples; the method comprises the following steps: establishing an oil type gas and coal gas identification triangular plate according to the relative contents of cis-1, 3-dimethylcyclohexane, normal octane and 2-methylheptane in an oil type gas and coal gas sample, and obtaining oil type gas and coal gas identification indexes according to the triangular plate; obtaining the relative contents of cis-1, 3-dimethylcyclohexane, normal octane and 2-methylheptane in the natural gas sample to be detected; and identifying the cause and the source of the natural gas sample to be detected in the research area according to the triangular chart and the identification indexes by utilizing the relative contents of cis-1, 3-dimethylcyclohexane, normal octane and 2-methylheptane in the natural gas sample to be detected.

Description

technical field [0001] The invention relates to a method for identifying the origin of natural gas by using the relative content of cis-1,3-dimethylcyclohexane, n-octane and 2-methylheptane, and belongs to the technical field of identification of the origin and source of natural gas in oil and gas exploration . Background technique [0002] Natural gas is a green, environmentally friendly, low-carbon, efficient and clean energy that occupies an important position in the world's energy structure and is also one of the important directions and trends of future energy development (natural gas, unconventional, new energy). At present, the proportion of natural gas in my country's energy structure (only about 8%) is lower than the world average (about 25%). Vigorously strengthening the exploration and development of natural gas will help improve my country's energy structure, protect the ecological environment, and ensure national energy. Security of supply is of great importance...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02G01N30/86
CPCG01N30/02G01N30/86G01N30/8631
Inventor 王晓波邹才能李剑胡国艺谢增业国建英杨春霞潘松圻莫午零王志宏董才源齐雪宁
Owner PETROCHINA CO LTD
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