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A method for identifying the origin and source of CO2 in natural gas and its application

A technology of natural gas and CO2, applied in the field of oil and gas exploration, can solve problems such as spending a lot of time and energy, and achieve high reliability, strong operability, and fast analysis

Active Publication Date: 2019-06-11
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently, regarding the non-hydrocarbon gas CO 2 The cause and source are mostly CO 2 Components and isotopes are used as identification indicators, and combined with geological conditions for comprehensive analysis and research, but this requires a lot of time and effort
So far, there is still a lack of research on the non-hydrocarbon gas CO 2 A method for fast, accurate and effective identification of organic and inorganic causes and sources

Method used

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  • A method for identifying the origin and source of CO2 in natural gas and its application
  • A method for identifying the origin and source of CO2 in natural gas and its application
  • A method for identifying the origin and source of CO2 in natural gas and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] This embodiment provides a method for identifying CO in natural gas 2 The method of origin and origin, which proceeds in the following steps:

[0050] The natural gas extracted from the Kela 2 natural gas field was used as the research sample, according to figure 1 The flow shown is for detection and analysis:

[0051] A stainless steel high-pressure steel cylinder with a volume of 1L and two valves and double ports was selected, and a mechanical pump was used to evacuate the above-mentioned high-pressure stainless steel cylinder to 10°C before natural gas sample collection. -1 Below Pa;

[0052] Connect the first interface of the above-mentioned stainless steel high-pressure steel cylinder to the wellhead of the natural gas through the connecting pipeline and the first pressure reducing valve, use natural gas to repeatedly flush the above-mentioned steel cylinder 4-6 times, each time lasting more than 10 minutes, and then collect the middle section of the gas flow of...

Embodiment 2

[0066] This embodiment provides a method for identifying CO in natural gas 2 The method of origin and origin, which proceeds in the following steps:

[0067] The natural gas extracted from Tazhong I gas field was used as the research sample, according to figure 1 The flow shown is for detection and analysis:

[0068] A stainless steel high-pressure steel cylinder with a volume of 0.7L and double valves and double ports was selected, and a mechanical pump was used to evacuate the above-mentioned high-pressure stainless steel cylinder to 10°C before natural gas sample collection. -1 Below Pa;

[0069] Connect the first interface of the above-mentioned stainless steel high-pressure steel cylinder to the wellhead of the natural gas through the connecting pipeline and the first pressure reducing valve, use natural gas to repeatedly flush the above-mentioned steel cylinder 4-6 times, each time lasting more than 10 minutes, and then vacuumize the steel cylinder to 10 - 1 Below Pa...

Embodiment 3

[0075] This embodiment provides a method for identifying CO in natural gas 2 The method of origin and origin, which proceeds in the following steps:

[0076] The natural gas extracted from the Akemomu natural gas field was used as the research sample, according to figure 1 The flow shown is for detection and analysis:

[0077] In this embodiment, the method of Embodiment 1 is used to sample the natural gas sample extracted from the Akemomu natural gas field, and the natural gas sample is subjected to CO 2 The carbon isotope ratio of δ 13 C CO2 And the detection of the isotope ratio R / Ra of helium; Then according to the CO established in Example 1 2 Organic and inorganic origin and source identification indicators are compared with the helium isotope ratio R / Ra and CO measured by the natural gas sample in this embodiment 2 The carbon isotope ratio of δ 13 C CO2 Analyze; the present embodiment measures 1≥R / Ra>0.2, and measures CO 2 The carbon isotope ratio of -10‰13 C C...

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Abstract

The invention provides a method for identifying an origin and a source of CO2 in natural gas and application of the method. The method comprises the steps of collecting a natural gas sample, measuring a carbon isotope ratio and a helium isotope ratio and building an identification index system for identifying the origin and the source of CO2 concomitant with rare gas in the natural gas. The identification index system is implemented in the mode that if R / Ra<=1 and delta<13>CCO2<=-10%o, CO2 mostly has a shell source and an organic origin; if R / Ra<=1 and delta<13>CCO2>=-8%o, CO2 mostly has the shell source and an inorganic origin; if R / Ra<=0.2 and -10%o<delta<13>CCO2<-8%o, CO2 mostly is a mixture of the shell source and the organic origin with the shell source and the inorganic source; if 1>=R / Ra>0.2 and -10%o<delta<13>CCO2<-8%o, CO2 is mostly is a mixture of the shell source and the organic origin with a mantle source and the inorganic origin or a mixture of the shell source and the inorganic origin with the mantle source and the inorganic origin; if R / Ra>1, CO2 mostly has the mantle source and the inorganic origin.

Description

technical field [0001] The invention belongs to the technical field of oil and gas exploration, and relates to a non-hydrocarbon gas CO 2 A method for identifying the origin and source of organic and inorganic substances, especially a method for identifying CO in natural gas 2 Methods of genesis and origin and their applications. Background technique [0002] Natural gas is mainly composed of hydrocarbon gases, a small amount of non-hydrocarbon gases, and trace amounts of rare gases. non-hydrocarbon gas CO 2 It is an important part of natural gas, and its relationship with hydrocarbons is very close. Therefore, the development of non-hydrocarbon gas CO 2 The study on the origin and source identification of natural gas is of great significance for comprehensively understanding the origin and source of natural gas and guiding the exploration and development of natural gas. Currently, regarding the non-hydrocarbon gas CO 2 The cause and source are mostly CO 2 Components ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N30/02
CPCG01N30/02G01N2030/025
Inventor 王晓波李剑王东良李志生谢增业马成华王义凤李谨王志宏田继先马卫郝爱胜
Owner PETROCHINA CO LTD