Flaring in oil and gas is the controlled burning of unwanted or excess natural gas at production sites, refineries, processing plants, and other industrial facilities. The gas is directed through a flare stack and ignited to reduce pressure, maintain operational safety, and dispose of gas that cannot be stored, processed, or transported. Although flaring can prevent dangerous gas accumulation, it also releases carbon dioxide, methane, soot, and other pollutants into the atmosphere.
Oil and gas production involves much more than extracting crude oil from underground reservoirs. Natural gas, water, sand, and other materials often come to the surface alongside the oil.
In many situations, the natural gas can be captured, processed, and sold. However, there are occasions when the gas cannot be stored or transported safely. It may also need to be removed quickly to protect workers, equipment, and surrounding communities.
In such circumstances, the gas may be burned through a process called flaring.
The large flame sometimes visible above oilfields, refineries, offshore platforms, and processing facilities usually comes from a flare stack. Although the sight can appear alarming, the flame may be part of a controlled safety system.
However, routine flaring has become an important environmental issue. Burning valuable gas wastes energy and produces greenhouse gases and air pollutants. Governments, energy companies, environmental organisations, and local communities are therefore placing greater pressure on the industry to reduce unnecessary flaring.
This guide explains what flaring is in oil and gas, how it works, why it happens, its environmental consequences, and the alternatives available.
What Is Flaring in Oil and Gas?
Flaring in oil and gas is the controlled combustion of natural gas or other combustible gases that cannot be used, stored, processed, or transported.
The gas is sent through a pipe to an elevated structure called a flare stack. At the top of the stack, an ignition system burns the gas and converts much of it into carbon dioxide and water vapour.
Flaring is used at:
- Oil production fields
- Natural gas processing plants
- Petroleum refineries
- Offshore oil and gas platforms
- Chemical facilities
- Storage terminals
- Liquefied natural gas facilities
- Petrochemical plants
A flare system is not simply an open flame. It is an engineered safety system designed to collect gases from different areas of a facility and dispose of them in a controlled manner.
The flare may operate continuously, occasionally, or only during emergencies. The reason for flaring depends on the type of facility, available infrastructure, operating conditions, and safety requirements.
Why Is Natural Gas Produced With Crude Oil?
Oil and natural gas often exist together beneath the ground. When crude oil is brought to the surface, pressure changes cause dissolved gas to separate from the liquid.
This gas is commonly called associated gas because it is produced alongside crude oil.
Associated gas may contain:
- Methane
- Ethane
- Propane
- Butane
- Carbon dioxide
- Hydrogen sulphide
- Water vapour
- Other hydrocarbons
When suitable equipment and infrastructure are available, this gas can be processed and used as fuel. It may also be transported through pipelines, converted into liquefied natural gas, or used to generate electricity.
However, some oilfields are located in remote areas without gas pipelines, processing plants, or nearby customers. In these locations, producers may consider flaring the fastest or cheapest way to dispose of unwanted gas.
How Does Gas Flaring Work?
A flare system collects combustible gases released from equipment, pressure-relief valves, storage tanks, and processing units.
The gas flows through a network of pipes towards the flare stack. Before reaching the top, it may pass through equipment designed to remove liquids and prevent damage to the flare system.
At the flare tip, the gas mixes with air and is ignited. A pilot flame is often kept burning to ensure that incoming gas catches fire immediately.
The main parts of a flare system include:
Flare Header
The flare header is a network of pipes that collects gas from different parts of the facility. It directs the gas towards the flare stack.
Knockout Drum
A knockout drum removes liquid droplets from the gas stream. This helps prevent burning liquids from being released through the flare tip.
Flare Stack
The flare stack is a tall structure that releases and burns gas at a safe distance from workers, equipment, and buildings.
Flare Tip
The flare tip is the point where the gas exits and burns. It is designed to create stable combustion under different flow and weather conditions.
Pilot Ignition System
The pilot system provides a continuous or automatically activated flame. It ensures that released gas does not enter the atmosphere unburned.
Steam or Air Injection
Some flare systems inject steam or air into the flame. This improves combustion and reduces visible smoke.
Monitoring Equipment
Sensors may monitor gas flow, flame stability, pressure, temperature, and emissions. Cameras can also help operators confirm that the flare is burning correctly.
Why Do Oil and Gas Companies Use Flaring?
Flaring occurs for several operational and safety reasons. Not every flare event has the same purpose.
Emergency Pressure Relief
One of the most important reasons for flaring is emergency pressure control.
Oil and gas facilities contain equipment operating under high pressure. If pressure rises beyond safe limits, valves automatically release gas into the flare system.
Burning the gas prevents it from accumulating around equipment, where it could create an explosion or fire hazard.
Emergency flaring may occur because of:
- Equipment failure
- Power loss
- Compressor shutdown
- Blocked pipelines
- Sudden process disruption
- Fire within a facility
- Unexpected pressure changes
In this context, flaring acts as a critical safety mechanism.
Start-Up and Shutdown Operations
Industrial facilities may flare gas when equipment is started, stopped, tested, or maintained.
During start-up, operating conditions may not yet be stable enough to process gas properly. During shutdown, remaining gas must often be removed from pipes and vessels.
These flare events are generally temporary and may be planned in advance.
Lack of Pipeline Infrastructure
Oilfields may produce gas in areas where no pipeline is available to transport it.
Building a gas pipeline can be expensive, particularly when production sites are remote or have a limited operating life. If companies do not consider gas recovery commercially viable, they may flare the associated gas.
This is one of the main causes of routine flaring in oil-producing regions.
Gas Quality Problems
Natural gas may contain impurities that make it unsuitable for immediate sale or use.
High levels of hydrogen sulphide, carbon dioxide, water, or other contaminants may require specialised treatment. If suitable processing equipment is unavailable, the gas may be flared.
Testing New Wells
When a new oil or gas well is tested, operators need to measure flow rate, pressure, and production potential.
The produced gas may be flared temporarily because permanent processing and transport facilities have not yet been installed.
Well-testing flares can help engineers determine whether commercial production is practical.
Equipment Maintenance
Gas must sometimes be removed from equipment before inspection, repair, or replacement work can begin.
Rather than releasing the gas directly into the atmosphere, operators may route it to the flare system.
Excess Gas Production
A facility may temporarily produce more gas than its processing or transport system can manage.
This can happen when production increases unexpectedly or when compressors, pipelines, or storage systems are unavailable. The excess gas may be flared to keep the rest of the operation stable.
What Is Routine Flaring?
Routine flaring is the regular burning of gas during normal oil production rather than during an emergency or temporary operating event.
It commonly occurs when producers have no practical system for capturing, processing, transporting, or using associated gas.
Routine flaring is different from safety flaring. Emergency flaring may be necessary to protect people and equipment, while routine flaring often reflects limited infrastructure or economic decisions.
The energy industry is under growing pressure to reduce routine flaring because the gas could potentially be used for electricity generation, heating, industrial processes, or fuel production.
What Is Non-Routine Flaring?
Non-routine flaring occurs because of temporary operating conditions, equipment problems, maintenance, start-up, shutdown, or emergencies.
It may be difficult to eliminate completely because facilities must have a safe way to manage sudden gas releases.
However, better equipment reliability, storage capacity, maintenance planning, and process controls can reduce the frequency and duration of non-routine flaring.
Flaring vs Venting: What Is the Difference?
Flaring and venting are two different methods of releasing gas.
Flaring burns the gas before it enters the atmosphere. This converts much of the methane into carbon dioxide.
Venting releases gas directly into the atmosphere without burning it.
Methane has a much stronger warming effect than carbon dioxide over shorter periods. For this reason, properly operated flaring is generally considered less harmful to the climate than direct methane venting.
However, flaring is not harmless. It still creates carbon emissions, and inefficient combustion may allow methane to escape unburned.
The preferred option is usually to capture and use the gas rather than flare or vent it.
Is Flaring Dangerous?
A properly designed and operated flare system is intended to improve safety. It keeps combustible gases away from workers, buildings, processing equipment, and potential ignition sources.
However, flaring can create hazards if the system is poorly maintained or incorrectly operated.
Potential risks include:
- Excessive heat radiation
- Smoke and soot
- Noise
- Flame instability
- Unburned gas releases
- Equipment damage
- Falling hot particles
- Exposure to toxic gases
- Fire spreading to nearby equipment
Flare stacks are therefore positioned at carefully calculated distances from occupied areas and critical infrastructure.
Operators must also consider wind direction, flame height, gas composition, pressure, and expected flow rate.
Environmental Effects of Gas Flaring
Gas flaring affects the environment in several ways.
Greenhouse Gas Emissions
When natural gas burns, it produces carbon dioxide. Carbon dioxide traps heat in the atmosphere and contributes to climate change.
Although burning methane is usually preferable to releasing it directly, routine flaring still adds substantial greenhouse gas emissions.
Poor combustion can make the problem worse because some methane may pass through the flame without burning.
Air Pollution
Flares may release pollutants such as:
- Carbon monoxide
- Nitrogen oxides
- Sulphur dioxide
- Volatile organic compounds
- Particulate matter
- Black carbon
- Unburned hydrocarbons
The exact emissions depend on gas composition, combustion temperature, oxygen supply, equipment design, and weather conditions.
Black Carbon and Soot
A smoky flare may release black carbon, commonly known as soot.
Black carbon can affect human health and local air quality. It can also settle on snow and ice, causing them to absorb more heat and melt faster.
Steam-assisted and air-assisted flare systems can reduce visible smoke by improving combustion.
Noise Pollution
High-pressure gas moving through a flare can create considerable noise. This may affect workers and nearby communities, especially when flaring continues for long periods.
Light Pollution
Flare flames can produce intense light that remains visible at night. Continuous flaring may disturb local communities and wildlife.
Wasted Energy
Natural gas is a valuable energy resource. Flaring destroys gas that could otherwise be used to generate electricity, provide heating, produce chemicals, or support industrial operations.
This wasted energy also represents lost revenue for producers and governments.
Health Effects on Nearby Communities
Communities living near oilfields and processing facilities may be concerned about prolonged exposure to flare emissions.
Potential health effects depend on pollutant levels, flare efficiency, distance, weather, duration, and the presence of other industrial emissions.
Poorly controlled flaring may contribute to respiratory irritation, headaches, eye discomfort, and other health concerns.
Accurate monitoring is necessary to determine the actual level of exposure and identify whether corrective action is needed.
Does Flaring Always Produce Black Smoke?
No. A properly operating flare may burn with little or no visible smoke.
Black smoke usually indicates incomplete combustion. It may occur when heavy hydrocarbons are present or when the flame does not receive enough oxygen.
Operators may inject steam, air, or water into the flare to improve mixing and reduce soot.
However, even a smokeless flame still produces emissions. The absence of visible smoke does not mean that the flare has no environmental impact.
How Is Flaring Measured?
Operators can measure flaring by recording the volume of gas sent to the flare system.
Flow meters are installed within the flare network to estimate or measure the amount of gas being burned.
Monitoring systems may also record:
- Gas composition
- Flame temperature
- Combustion efficiency
- Duration of flaring
- Frequency of flare events
- Smoke production
- Methane emissions
- Carbon dioxide emissions
Reliable measurement is essential because inaccurate data can make it difficult to understand the true scale of flaring.
Satellite observations are increasingly used to identify large flare sites and estimate global flaring levels.
How Can Oil and Gas Companies Reduce Flaring?
Reducing flaring requires a combination of engineering, investment, planning, regulation, and monitoring.
Gas Capture and Processing
Companies can install equipment to capture associated gas instead of burning it.
The gas can then be processed to remove water, sulphur compounds, carbon dioxide, and other impurities.
Once treated, it may be sold or used on-site.
Building Gas Pipelines
A new pipeline can connect an oilfield with processing plants, power stations, industrial customers, or existing gas networks.
This may require substantial investment, but it can turn waste gas into a commercial product.
Electricity Generation
Associated gas can be used in generators or turbines to produce electricity.
The electricity may power the production site or be supplied to nearby communities and industrial facilities.
Gas Reinjection
Gas can sometimes be compressed and reinjected into the underground reservoir.
Reinjection may maintain reservoir pressure, improve oil recovery, or store the gas for future production.
Small-Scale Liquefied Natural Gas
Remote sites may convert gas into liquefied natural gas. Cooling the gas reduces its volume and makes road or ship transport more practical.
Compressed Natural Gas
Gas can also be compressed and transported in high-pressure containers.
This approach may be suitable where building a permanent pipeline is not commercially realistic.
Converting Gas Into Liquid Fuels
Gas-to-liquids technology can convert natural gas into synthetic diesel and other liquid products.
However, these facilities can be expensive and require a sufficient, consistent gas supply.
Improved Maintenance
Equipment failures are a major cause of non-routine flaring.
Preventive maintenance, spare equipment, automated controls, and early fault detection can reduce unnecessary flare events.
Better Production Planning
Oil production should be matched with available gas-processing and transport capacity.
Starting production before gas infrastructure is ready can lead to avoidable routine flaring.
Stronger Monitoring and Reporting
Accurate flare measurement allows operators to identify the largest sources and prioritise improvements.
Public reporting can also encourage companies to meet reduction targets.
Can Gas Flaring Be Completely Eliminated?
Eliminating all flaring is difficult because emergency flare systems remain important for industrial safety.
Facilities must be able to release pressure quickly during fires, equipment failures, and serious process disruptions.
However, routine flaring can often be reduced significantly.
The realistic goal is usually to eliminate unnecessary routine flaring while maintaining limited emergency flaring for safety.
Technology, regulation, economic incentives, and better infrastructure all play a part in achieving this balance.
Regulations Around Oil and Gas Flaring
Flaring regulations vary between countries and regions.
Governments may require operators to:
- Obtain permission before routine flaring
- Measure the volume of gas flared
- Report emissions
- Pay taxes or penalties
- Meet combustion-efficiency standards
- Reduce methane emissions
- Develop gas-utilisation plans
- Use approved flare equipment
- Investigate excessive flare events
Regulation is most effective when monitoring is accurate and enforcement is consistent.
Some governments also provide incentives for gas capture, electricity generation, and infrastructure development.
Why Does Flaring Continue?
Flaring continues because oilfields, markets, infrastructure, and regulations differ considerably.
In some locations, capturing gas is technically difficult or commercially unattractive. A remote field may produce too little gas to justify building a long pipeline.
Companies may also face delays in obtaining permits, financing, equipment, or access to energy markets.
However, critics argue that routine flaring often continues because burning gas is cheaper than investing in recovery systems.
Reducing flaring therefore requires both technical solutions and economic pressure.
The Role of Fuel Supply Companies
The oil and gas supply chain includes production, refining, storage, transport, and final delivery.
While flaring occurs mainly at production and processing facilities, reducing waste at the source can improve the overall efficiency of the energy system.
123 Oil operate closer to the customer-facing end of this chain, where reliable fuel planning and delivery help domestic, commercial, agricultural, and industrial users manage their energy requirements.
The Future of Flaring in Oil and Gas
The future of flaring is likely to be shaped by stricter methane rules, improved monitoring, investor pressure, and technological development.
Satellite data is making large flare sites easier to identify. Sensors and digital monitoring systems are also helping operators understand when and why flaring occurs.
Companies may increasingly use artificial intelligence and predictive maintenance to detect equipment problems before they lead to emergency shutdowns.
Gas recovery technology is also becoming more flexible. Smaller processing units, portable compressors, and modular electricity generators can make gas capture practical at remote sites.
However, meaningful progress will depend on transparent reporting and investment in infrastructure. Setting reduction targets without improving gas-handling systems is unlikely to solve the problem.
Conclusion
Flaring in oil and gas is the controlled burning of natural gas that cannot be safely used, stored, processed, or transported.
It is an important emergency safety system because it prevents combustible gas from building up around industrial equipment. However, routine flaring wastes valuable energy and releases greenhouse gases, soot, and other pollutants.
The environmental effects of flaring can be reduced through gas capture, pipelines, electricity generation, reinjection, improved maintenance, and stronger regulation.
Although emergency flaring may always be necessary at certain facilities, routine flaring can often be prevented. The long-term challenge is to protect operational safety while ensuring that valuable natural gas is used rather than unnecessarily burned.
Frequently Asked Questions
The main purpose of flaring is to burn excess or unwanted gas safely. It helps control pressure, protect equipment, and prevent combustible gas from accumulating around industrial facilities.
Most flaring involves natural gas, which mainly contains methane. The gas may also contain ethane, propane, butane, carbon dioxide, hydrogen sulphide, and other hydrocarbons.
Flaring is generally less harmful than venting because it converts much of the methane into carbon dioxide. However, both processes produce emissions, so capturing and using the gas is preferable.
Oil companies may flare gas because of emergencies, equipment shutdowns, maintenance, poor gas quality, limited processing capacity, or a lack of pipelines and storage facilities.
Yes. Gas flaring releases carbon dioxide, nitrogen oxides, carbon monoxide, soot, and other pollutants. Inefficient flares may also release unburned methane.
Yes. Gas can be captured and used for electricity generation, heating, industrial fuel, pipeline supply, liquefied natural gas production, or reinjection into an underground reservoir.
Routine flaring can often be avoided with suitable infrastructure and planning. However, emergency flare systems may still be required to manage sudden pressure releases and protect workers and equipment.