CO2 Injection Heating Using Geothermal Water Heat Exchange
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Solution Overview
Problem
The existing methods for heating carbon dioxide before injection into deep aquifers are costly and energy-intensive, leading to potential well-bore integrity issues due to temperature differentials, which can cause cement debonding and CO2 leakage.
Innovation Solution
Utilizing hot water from a distant well for efficient heat exchange to preheat carbon dioxide, either through surface heat exchangers or annular heating within the injection well, reducing the temperature differential and preserving well-bore integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If cold CO2 is injected directly without surface heating, then energy consumption and capital costs are reduced, but temperature differential increases causing cement debonding and well-bore integrity issues
Solution Approach 1:
The system performs preliminary heating of CO2 by injecting hot water into the formation before CO2 injection, or pre-heats CO2 in surface heat exchangers using geothermal water, to reduce temperature differential before main injection occurs
Solution Approach 2:
Hot water from the formation or geothermal sources serves as an intermediary heat transfer medium to transfer thermal energy to the CO2, avoiding direct combustion heating and reducing both energy consumption and temperature shock to the well-bore
2Reliability
If surface heating of cold CO2 is performed using solar, thermal or electrical sources, then temperature differential is reduced preserving well-bore integrity, but operational costs and energy consumption increase
Solution Approach 1:
The system uses the formation's own hot water or geothermal water as the heating source, allowing the formation to heat itself rather than requiring external energy inputs, thereby maintaining well-bore integrity while minimizing additional energy consumption
Solution Approach 2:
The system converts the naturally occurring hot water in the formation, which would otherwise be waste, into a useful heating resource to warm the injected CO2, turning a potential harm (temperature differential) into a benefit
3Temperature
If hot water is injected into the formation for heating, then CO2 temperature is elevated reducing cement debonding risk, but pressure build-up may occur affecting injectivity
Solution Approach 1:
The system injects hot water at controlled rates and volumes that are sufficient to heat the CO2 to the desired temperature but not excessive enough to cause harmful pressure build-up, optimizing the balance between heating effectiveness and injectivity
Solution Approach 2:
The heating process is divided into stages: initial hot water injection to establish thermal gradients, followed by CO2 injection, with monitoring and adjustment of parameters to manage pressure while maintaining temperature elevation
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 method significantly reduces operational costs and energy consumption while maintaining well-bore integrity by ensuring the carbon dioxide reaches a temperature close to the formation temperature, thereby minimizing cement debonding and CO2 leakage.
Implementation Method 1
heating methods by using the available hot water in an efficient heat exchange cycle
Implementation Method 2
The injection of hot water heats the incoming cold CO2 as it rises up the well-bore
Data Source
AI summary
A process for injection of CO2 in high-temperature reservoirs, where preheating of the injected stream is necessary. The process comprises producing hot water from a distant well, using the produced hot water in a surface heat exchanger for heating CO2. Alternatively, the produced hot water may be used in a wellbore heat exchanger to heat the incoming CO2 as a counter-current heat exchanger. When the available CO2 is substantially cooler than the ambient, preheating via solar thermal is desirable prior to feeding to the heat exchanger.