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A Method for Underground Gasification Isotope Tracing

An isotope tracer and underground gasification technology, applied in the field of isotope tracer measurement, can solve the problems that cannot be effectively used to analyze the characteristics of gasification, the product is uncertain, and it is difficult to form compounds.

Active Publication Date: 2016-11-02
ENN SCI & TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the coal seam contains complex organic matter and a large amount of minerals, and there is a high temperature, most of the above-mentioned tracers cannot meet the needs of tracers in underground gasification technology, such as organic tracers (such as formaldehyde, ethanol, isopropanol, tritiated n-butanol, tritiated ethanol, etc.) are prone to decomposition at high temperature during the underground gasification process, and the products generated after decomposition are complex, making quantitative analysis of the produced gas difficult; Ionic classes (such as SCN - , NO 3 - 、Br - , I - ) Because the products in underground gasification are uncertain, it cannot be effectively used to analyze the characteristics of underground gasification; inert gases have stable chemical properties and are not easy to form compounds, so they are used to mark the underground gas flow rate and the volume effect of underground burn-up zone Good, but it is difficult to use it to label gasification reactions to a large extent
It can be seen that, so far, no tracer suitable for marking underground gasification has been found, nor has it been found to use this kind of tracer to correctly obtain the chemical changes in the gasifier to adjust the process parameters in gasification , so that it can realize the method of stable gas production

Method used

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  • A Method for Underground Gasification Isotope Tracing
  • A Method for Underground Gasification Isotope Tracing

Examples

Experimental program
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Effect test

Embodiment 1

[0069] This embodiment uses the radioactive isotope deuterium (T) to mark the conversion process of the water input at the inlet wellhead. The structure of the underground gasifier is as follows: figure 2 As shown, the process includes:

[0070] 1. First, take a small amount of coal gas at the gas outlet wellhead 2, and measure the contrast background content U of the isotope T in the original underground gas product 0 ;

[0071] 2. The content is U (unit Bq) (the U here has been subtracted from the contrast background content U of the isotope T in 1 0 ) isotope T-labeled water is uniformly mixed with water of volume B (take 10m here 3 ), injected into the underground burn-out area 3 through the air inlet wellhead 1 (the proportion of T in the hydrogen isotope is very small, and generally exists in the form of HT (tritium gas) and HTO (tritium water), so in the reaction products, only measure the amount of HT and HTO);

[0072] 3. From the time of injection, every 1 hour...

Embodiment 2

[0078] This example uses stable isotope 13 C or 18 O to mark the CO input at the intake wellhead 2 the transformation process. The structure of the underground gasifier is as follows: figure 2 As shown, the process includes:

[0079] 1. First, take a small amount of gas at the gas outlet wellhead 2, and measure the contrast background content Y of the isotope T in the original underground gas product 0 ;

[0080] 2. The volume is Y (in milliliters) (the isotope in 1 has been subtracted from Y here 13 C or 18 O's comparative background content Y 0 ) isotopically labeled CO 2 with volume X of CO 2 After uniform mixing, it is injected into the underground burn-out zone 3 through the air inlet wellhead 1; (in this embodiment, CO 2 The following reactions mainly occur in underground gasification: CO 2 +C=2CO, so isotopically labeled CO 2 mainly converted to CO or not participating in the reaction or remaining in the gasifier);

[0081] 3. From the start of gas injecti...

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Abstract

An embodiment of the present invention provides an underground gasification isotope tracer method, belonging to the field of isotope tracer measurement, to obtain gasification conditions in a gasifier. The underground gasification isotope tracer method includes: mixing isotope-labeled reactants of the same kind with unlabeled reactants of the same kind, and adding them to the underground gasification zone for reaction; The amount of the isotope-labeled element participating in the reaction is detected, and the amount of the unlabeled same reactant participating in the reaction is calculated. The invention can be used to obtain gasification conditions in underground gasification, furthermore, the gasification process can be regulated through the gasification conditions to realize stable gas production.

Description

technical field [0001] The invention relates to the field of isotope tracer measurement, in particular to an underground gasification isotope tracer method. Background technique [0002] Underground coal gasification is a method of obtaining coal gas from underground coal seams in a non-mining way in coal seams hundreds of meters below the ground. Since this method does not need to set up a workplace underground, the underground gasifier operates completely in an unknown state. To measure and control the gasifier, the only way to measure and control the gasifier is through the inlet wellhead and the gas outlet of the gasifier. The method of tracking and measuring the tracer between the wellheads to obtain the required process parameters and control them. [0003] The types of existing tracers are generally divided into ion, organic, noble gas and radioactive. Because the coal seam contains complex organic matter and a large amount of minerals, and there is a high temperatu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/295E21B47/11
Inventor 赵娟董玉新潘霞李金刚付伟贤
Owner ENN SCI & TECH DEV