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Method for analyzing methane carbon isotope change in shale gas release process

A carbon isotope and analysis method technology, applied in the field of geological exploration and development, which can solve the problems of lack of loss of gas isotope change data, inability to obtain gas sample analysis, lack of overall understanding, etc.

Active Publication Date: 2021-03-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the shale core drilling process, some of the gas stored in the core is released from the bottom of the well to the wellhead (lost gas), and this part of the gas sample cannot be obtained for analysis. Overall understanding of the change law of methane carbon isotope composition during the gas release process of shale cores

Method used

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  • Method for analyzing methane carbon isotope change in shale gas release process
  • Method for analyzing methane carbon isotope change in shale gas release process
  • Method for analyzing methane carbon isotope change in shale gas release process

Examples

Experimental program
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Effect test

Embodiment 1

[0124] This embodiment provides an analysis method of methane carbon isotope change during rock release process. This analysis method includes the following steps:

[0125] S1. Get the shale rock like, the shale rock is sampled on site, and the amount of analytical gas released in different time during the field desorption process and methane carbon isotopic The ratio; the solution includes first order desorption and second order desorption; in the first order desorption, the desorption gas is derived from the free gas and adsorption gas in the shale rock. In the second order desorption, solution Inversion is derived from adsorbing gas in the shale rock.

[0126] S2. Get the ratio of methane carbon isotopes in the pseudonym-release in the initial stage of the shale development, and the initial value of the ratio of methane carbon isotopes in the gas in the gas at T = 0 13 C (0) .

[0127] S3. The total amount of adsorbent gas samples as described under stratum thermostat condition...

Embodiment 2

[0149] S1 and S6. Using the shale gas on-site decision instrument to perform on-site desorption, the desorption process is divided into two phases: first-order mud circulation temperature (45 ° C) conditions, in order to obtain data for recovery loss The second order 110 ° C desorption, close to the bottom of the bottom, and the desorption process of simulating the downhole temperature condition. A solution of absorbent samples were collected every 60 min during the desorption process, and the gas component and alkane gas carbon isotope test were carried out after taking it back to the laboratory. In the second order desorption (110 ° C), the analyzed gas is mainly adsorbed, and the adsorption gas is an adivation of the second order desorption. As shown in Table 1, a page rock gas well rock heart analyzes gas gas and isotope composition data.

[0150] Table 1 The amount of analytical gas released by rock rock is composed of methane carbon isotope

[0151]

[0152] S2. Existing l...

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Abstract

The invention belongs to the technical field of geological exploration and development, and relates to a method for analyzing methane carbon isotope change in a shale gas release process. The analysismethod comprises the following steps: analyzing a shale sample on site, obtaining a fractionation coefficient and a residual ratio of adsorbed gas, and obtaining a fractionation coefficient and a residual ratio of free gas, so as to obtain a change rule of methane isotopes in shale release gas in the process from drill lifting to on-site desorption of the shale sample. According to the analysis method for the methane carbon isotope change in the shale gas release process, the change rule of the methane carbon isotope in the shale gas release is obtained through simulation of the established mathematical model, and the analysis method can be used for tracing the shale gas development state.

Description

Technical field [0001] The present invention belongs to the field of geological exploration and development, and more particularly to the analysis method of methane carbon isotope change in a rock release process. Background technique [0002] Shale gas refers to the unconventional natural gas deposited in the rich organic mud shale and its interlayer, and the ingredient is mainly natural gas, and the ingredient is mainly made of methane. It is a clean, efficient energy resource and chemical raw material. . For shale gas, the mechanism of carbon isotopic in shale gas, the changes of methane carbon isotopes during production process are key issues in oilfield industries. [0003] The carbon isotope value in the hydrocarbon generation process has a regular change as maturity increases, migration aggregation, microbial effects, and other hydrocarbon mixed changes, so hydrocarbons stabilize hydrocarbon isotopes are often used for oil and gas transfer traces. , Organic matrix type, so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/24
CPCG01N33/24
Inventor 陶成申宝剑俞凌杰腾格尔翟常博范明王杰杨华敏张彩明
Owner CHINA PETROLEUM & CHEM CORP