Overview

The Quest Carbon Capture and Storage Project is an operational energy infrastructure initiative located in Alberta, Canada. Commissioned in 2015, the project focuses on capturing carbon dioxide emissions from natural gas processing activities. The primary fuel source for the associated operations is natural gas, which is utilized in the production of hydrogen through steam methane reformation. This hydrogen is subsequently used to upgrade bitumen extracted from oil sands into synthetic crude oil. The project represents a significant effort in geologic carbon storage, aiming to mitigate greenhouse gas emissions from heavy industry.

Location and Operational Context

The capture unit is situated at the Scotford Upgrader in Alberta, Canada. This location is integral to the project's function, as it allows for the direct integration of carbon capture technology with existing industrial processes. The facility specifically targets carbon dioxide produced during the steam methane reformation process. It is important to note that carbon dioxide is only captured from the steam methane reformer at the Scotford Upgrader. Other sources of emissions at the facility remain unabated, meaning they are not currently included in the Quest project's capture scope. This selective approach highlights the specific technological focus on hydrogen production emissions.

Capture Capacity and Efficiency

The Quest project is designed to capture one million tonnes of CO2 emissions per year. These emissions are stored in underground geologic formations, providing a long-term solution for carbon sequestration. Between 2015 and 2019, the facility demonstrated significant operational performance. During this period, the facility captured 5 megatonnes out of the 7.5 megatonnes produced by the steam methane reformer. This performance resulted in an average CO2 capture efficiency of 67%. The project continues to operate, maintaining its role in reducing the carbon footprint of synthetic crude oil production in Alberta.

How does the Quest carbon capture process work?

The Quest project captures carbon dioxide generated by steam methane reformation at the Scotford Upgrader in Alberta, Canada. This process produces hydrogen, which is used to upgrade bitumen from oil sands into synthetic crude oil. The facility captures one million tonnes of CO2 emissions per year and stores it in underground geologic formations.

Process Steps

Step Description
1. Steam Methane Reformation Produces hydrogen for bitumen upgrading; generates CO2 as a byproduct.
2. CO2 Capture Uses amine absorption technology to separate CO2 from the reformer's flue gas.
3. Compression Compresses CO2 into a supercritical fluid for efficient transport.
4. Pipeline Transport Transports the supercritical CO2 via pipeline to the storage site.
5. Geologic Storage Injects and stores CO2 in underground geologic formations.

Between 2015 and 2019, the facility captured 5 megatonnes out of the 7.5 megatonnes produced by the steam methane reformer, achieving an average CO2 capture efficiency of 67%. Carbon dioxide is only captured from the steam methane reformer at the Scotford Upgrader; other sources of emissions at the facility remain unabated. The chemical reaction for steam methane reformation can be represented as: CH4​+H2​O→CO+3H2​, followed by the water-gas shift reaction: CO+H2​O→CO2​+H2​.

Storage geology and infrastructure

The Quest project transports captured carbon dioxide from the Scotford Upgrader to its underground storage site via a dedicated pipeline infrastructure. The pipeline spans 64 km, connecting the capture unit in Alberta, Canada, to the geologic formation selected for long-term sequestration. This transport system is critical for moving the CO2 produced from steam methane reformation, which is used to upgrade bitumen from oil sands into synthetic crude oil. The facility captures carbon dioxide only from the steam methane reformer at the Scotford Upgrader, while other sources of emissions at the facility remain unabated.

Geologic Storage Formation

The carbon dioxide is stored in underground geologic formations located approximately two kilometers beneath the surface. The storage site utilizes a saline aquifer, a common choice for carbon capture and storage (CCS) projects due to its porosity and permeability. The saline aquifer provides a stable environment for the injected CO2, allowing it to remain trapped over geological timescales. The Quest project stores one million tonnes of CO2 emissions per year in this formation. Between 2015 and 2019, the facility captured 5 megatonnes out of the 7.5 megatonnes produced by the steam methane reformer, achieving an average CO2 capture efficiency of 67%.

Injection Reservoirs

The storage complex consists of three distinct reservoirs used for CO2 injection. These reservoirs are part of the saline aquifer system and are strategically selected to optimize the distribution and containment of the injected gas. The use of multiple reservoirs helps manage the pressure dynamics within the formation and enhances the overall capacity of the storage site. The injection process involves pumping the captured CO2 into these underground layers, where it is gradually trapped by physical and chemical mechanisms. The operational status of the Quest project is currently active, with continuous monitoring of the storage site to ensure the integrity of the geologic formations.

Operational history and performance metrics

The Quest Carbon Capture and Storage Project commenced operations on August 23, 2015, marking the start of its commercial phase at the Scotford Upgrader in Alberta, Canada. The facility is designed to capture carbon dioxide generated specifically from the steam methane reformation process, which produces hydrogen used to upgrade bitumen from oil sands into synthetic crude oil. The project targets an annual capture capacity of one million tonnes of CO2, which is subsequently stored in underground geologic formations. It is important to note that carbon dioxide capture is limited to the steam methane reformer; other emission sources at the facility remain unabated.

Performance Metrics and Efficiency

Operational data from the initial years of the project highlights the relationship between total production and captured volumes. Between 2015 and 2019, the facility captured 5 megatonnes of CO2 out of a total of 7.5 megatonnes produced by the steam methane reformer. This performance resulted in an average CO2 capture efficiency of 67% during that four-year period. The calculation for this efficiency can be represented as:

Capture Efficiency = (Captured CO2 / Total Produced CO2) × 100%

Applying the verified data: (5 Mt / 7.5 Mt) × 100% ≈ 67%.

Subsequent operational reviews indicate an improvement in performance metrics. By 2023, the capture efficiency had increased to 75.2%. This increase suggests operational optimizations or variations in the steam methane reformation output relative to the capture unit's throughput. The project continues to operate as a key component of the regional energy infrastructure, focusing on the geological storage of captured emissions to mitigate the carbon footprint of the synthetic crude oil production process.

What are the economic and policy challenges of CCS?

The economic viability of the Quest Carbon Capture and Storage Project has been heavily influenced by policy mechanisms and subsidy structures in Alberta, Canada. A significant controversy emerged regarding the carbon credit system between 2015 and 2021, often referred to as the carbon credit scandal. This period saw scrutiny over how carbon credits were allocated and valued, impacting the financial incentives for projects like Quest. The project benefited from a double subsidy structure provided by the Alberta government, which included both provincial carbon taxes and federal carbon pricing mechanisms. These subsidies were designed to bridge the gap between the cost of capturing and storing CO2 and the market price of carbon credits.

The double subsidy meant that the Quest project received financial support from two distinct levels of government, enhancing its economic feasibility. However, this arrangement faced criticism for potentially overcompensating the project, leading to debates about the efficiency of public spending on CCS technologies. The carbon credit scandal highlighted issues such as the valuation of stored CO2 and the transparency of credit allocation. Between 2015 and 2019, the facility captured 5 megatonnes out of the 7.5 megatonnes produced by the steam methane reformer, achieving an average CO2 capture efficiency of 67%. This performance metric was crucial in determining the number of carbon credits generated.

In 2022, the Alberta government initiated a phase-out of certain subsidy components, aiming to reduce the financial burden on the provincial budget and encourage greater market-driven investment in CCS. This phase-out introduced new economic challenges for the Quest project, requiring adjustments in operational strategies and financial planning. The reduction in subsidies necessitated a more rigorous assessment of the project's long-term economic sustainability, focusing on optimizing capture efficiency and exploring additional revenue streams. The transition period underscored the importance of stable policy frameworks in supporting large-scale CCS initiatives.

Policy Implications for Future CCS Projects

The experience of the Quest project offers valuable lessons for future carbon capture and storage initiatives. The interplay between government subsidies and market mechanisms plays a critical role in determining the success of CCS projects. Policies must balance the need for financial support with the goal of fostering market competitiveness. The phase-out of subsidies in 2022 demonstrated the potential risks associated with over-reliance on government funding, highlighting the need for diversified financial strategies. Future projects may benefit from more transparent and predictable policy environments, ensuring that economic incentives align with technological advancements and market conditions.

Why it matters

The Quest Carbon Capture and Storage Project holds significant strategic importance within the global energy infrastructure landscape, particularly as a benchmark for carbon management in the oil sands sector. Located at the Scotford Upgrader in Alberta, Canada, the facility demonstrates the viability of large-scale CO2 sequestration in underground geologic formations. The project captures one million tonnes of CO2 emissions per year, a capacity that establishes it as a major operational asset in the transition toward lower-carbon synthetic crude oil production.

Impact on Scotford Upgrader Emissions

The environmental significance of Quest is directly tied to its integration with the Scotford Upgrader’s steam methane reformation process. The capture unit targets carbon dioxide produced during the generation of hydrogen, which is essential for upgrading bitumen from oil sands into synthetic crude oil. While the steam methane reformer produces 7.5 megatonnes of CO2, the Quest facility captured 5 megatonnes between 2015 and 2019. This performance resulted in an average CO2 capture efficiency of 67% during that period.

It is critical to note that carbon dioxide is only captured from the steam methane reformer at the Scotford Upgrader. Other sources of emissions at the facility remain unabated. Consequently, the Quest project captures approximately one-third of the Scotford Upgrader’s total emissions, highlighting both the potential and the current limitations of point-source capture in complex refining environments. This distinction is vital for analysts evaluating the true carbon intensity of synthetic crude oil derived from oil sands bitumen.

Global CCS Data and Operational Precedent

Commissioned in 2015, the Quest project has contributed substantially to the global dataset for Carbon Capture and Storage (CCS) technologies. Its operational status provides engineers and energy researchers with long-term performance data on CO2 storage in underground geologic formations. The facility’s ability to sustain a capture rate of one million tonnes per year offers a scalable model for other natural gas and oil sands operations seeking to mitigate their carbon footprints. By focusing on the high-concentration CO2 stream from steam methane reformation, Quest demonstrates a targeted approach to emissions reduction that complements broader energy transition strategies. The project serves as a critical reference point for evaluating the efficiency and economic feasibility of CCS in the upstream and midstream energy sectors.

Worked examples

The Quest Carbon Capture and Storage Project provides a documented case study for evaluating carbon capture efficiency in industrial settings. The facility captures carbon dioxide from the steam methane reformer at the Scotford Upgrader in Alberta, Canada. Between 2015 and 2019, the project captured 5 megatonnes of CO2 out of 7.5 megatonnes produced, resulting in an average capture efficiency of 67%.

Example 1: Calculating Capture Efficiency

To determine the capture efficiency, divide the amount of CO2 captured by the total amount of CO2 produced, then multiply by 100 to express it as a percentage.

This matches the reported average CO2 capture efficiency of 67% for the period between 2015 and 2019.

Example 2: Determining Annual Capture Rate

The Quest project captures one million tonnes of CO2 emissions per year. To verify consistency with the 5 megatonnes captured between 2015 and 2019:

This confirms the stated annual capture rate of one million tonnes of CO2 per year.

Example 3: Calculating Unabated Emissions

To find the amount of CO2 that remains unabated (not captured) during the 2015–2019 period:

Thus, 2.5 megatonnes of CO2 from the steam methane reformer were unabated during this period. Other sources of emissions at the Scotford Upgrader are also unabated, but their quantities are not specified in the available data.

Applications and future outlook

The operational horizon of the Quest Carbon Capture and Storage Project is fundamentally tied to the lifecycle of the host facility, the Scotford Upgrader. The upgrader has an anticipated service life of 25 years, a timeframe that defines the primary window for carbon dioxide sequestration activities. This duration establishes the baseline for evaluating the long-term efficacy of the storage formation and the consistency of the capture process. The project is designed to function continuously within this period, ensuring that the captured emissions are systematically injected and retained in the underground geologic formations.

Over this 25-year operational span, the facility is projected to store a cumulative volume of greater than 27 million tonnes of CO2. This aggregate figure represents the total sequestration target derived from the annual capture rate of one million tonnes. The calculation of this total is straightforward: the annual capture capacity multiplied by the operational lifespan yields the expected cumulative storage. This metric is critical for assessing the project's contribution to the broader carbon budget of the oil sands industry. The storage capacity of the underground formation must be sufficient to accommodate this volume without compromising the integrity of the seal or the pressure dynamics of the reservoir.

The focus on the steam methane reformer as the sole source of captured emissions means that the 27 million tonnes figure represents a specific fraction of the total emissions from the Scotford Upgrader. Other sources of emissions at the facility remain unabated, which contextualizes the scale of the Quest project. The success of the future outlook depends on maintaining the average CO2 capture efficiency of 67% observed between 2015 and 2019. Any deviation in the efficiency of the steam methane reformation process or the hydrogen production line could impact the annual tonnage and, consequently, the cumulative total. The project serves as a critical case study for the scalability of carbon capture in heavy industrial settings.

See also

References

  1. "Quest Carbon Capture and Storage Project" on English Wikipedia
  2. Quest Carbon Capture and Storage Project - Shell
  3. Quest CCS - Global Carbon Capture and Storage Institute
  4. Quest Carbon Capture and Storage - Alberta Energy Regulator
  5. Quest Carbon Capture and Storage - IEA GHG