Monitoring Methane Hydrate Conversion via CO2 Injection Temperature
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Solution Overview
Problem
Current methods for converting methane hydrate to CO2 hydrate and monitoring gas ratios in downhole applications face challenges such as inefficient conversion, wellbore stability issues, and the need for accurate monitoring of fluid production to prevent hydrate formation, which can plug the wellbore.
Innovation Solution
A system and method utilizing temperature measurements and a modeling program to derive parameters related to the conversion of methane hydrate to CO2 hydrate, leveraging the different thermodynamic properties of methane and CO2, specifically the Joule-Thomson coefficients, to determine the ratios of CH4 and CO2 in mixed fluids, and monitor production efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If liquid CO2 is injected to convert methane hydrate to CO2 hydrate, then CO2 sequestration and CH4 production are achieved, but rock fracture may occur due to excessive injection
Solution Approach 1:
The system continuously monitors temperature at multiple depths during CO2 injection and uses this feedback to calculate real-time injection rates and hydrate conversion parameters. The temperature data reflects the thermal effects of CO2 injection and hydrate formation, allowing dynamic adjustment of injection parameters to prevent rock fracture while maximizing CH4 production.
Solution Approach 2:
The invention changes the monitoring parameters from traditional production rate measurements to temperature-based parameters at multiple depths. By measuring temperature changes and using them to calculate injection rates and conversion parameters, the system optimizes the injection process to achieve complete hydrate conversion without causing rock fracture.
2Speed
If acid catalysts are added to pumped liquid CO2 to speed up conversion, then conversion rate increases, but wellbore collapse may occur due to excessive catalyst
Solution Approach 1:
The system uses temperature monitoring at multiple depths to provide real-time feedback on conversion progress. By calculating conversion parameters from temperature data, the system can control the injection process to achieve rapid conversion without adding excessive acid catalysts that would cause wellbore collapse.
Solution Approach 2:
The invention replaces the need for acid catalysts with a temperature-based monitoring and control system. By using temperature measurements to calculate injection rates and conversion parameters, the system achieves fast conversion without chemical catalysts that would harm the wellbore structure.
3Measurement precision
If temperature measurements are used to monitor conversion and gas ratios, then accurate monitoring is achieved, but device complexity increases
Solution Approach 1:
The system uses a single temperature measurement infrastructure to achieve multiple monitoring functions: tracking conversion progress, determining gas ratios, calculating injection rates, and monitoring hydrate formation. This multi-functional approach eliminates the need for separate sensors for each parameter, reducing overall system complexity while maintaining high measurement precision.
Solution Approach 2:
Temperature serves as an intermediary parameter that indirectly provides information about conversion progress and gas ratios. By measuring temperature and using it to calculate other parameters through established relationships, the system avoids direct measurement of difficult-to-access parameters like gas composition at depth, simplifying the monitoring system.
4Productivity
If water production is not monitored, then production continues uninterrupted, but hydrate formation may plug the wellbore
Solution Approach 1:
The system monitors temperature changes that indicate water production and hydrate formation. By providing real-time feedback on water production rates through temperature data analysis, the system can detect when hydrate formation is occurring and adjust operations to prevent wellbore plugging while maintaining continuous production.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables accurate monitoring of methane hydrate conversion and gas ratios, ensuring efficient and safe production, allowing for effective CO2 sequestration and CH4 recovery while preventing wellbore plugging, thus making the process economically feasible.
Implementation Method 1
The modeling program uses at least one parameter relating to a thermodynamic properties that are substantially different between methane and CO2. The at least one parameter relating to thermodynamic properties may include Joule-Thomson coefficients of methane and CO2.
Data Source
AI summary
A method for monitoring production from a methane hydrate reservoir includes obtaining a plurality of temperature measurements in a wellbore connected with the methane hydrate reservoir; and deriving a parameter relating to conversion of methane hydrate to carbon dioxide (CO2) hydrate by injection of liquid CO2, wherein the deriving uses a modeling program and the plurality of temperature measurements, wherein the modeling program uses at least one parameter relating to a thermodynamic properties that are substantially different between methane and CO2. The at least one parameter relating to thermodynamic properties may include Joule-Thomson coefficients of methane and CO2. The parameter relating to the conversion of methane hydrate to CO2 hydrate may include a ratio of methane and CO2 in a mixed fluid.