Mitigating Hazards in the Oil & Gas Sector
The highly flammable nature of Oil & Gas means such sites need to be highly-rigorous in their approach to gas detection and monitoring. Here are just some of the points at which there is heightened risk, and how they can be minimised.
Exploration
Exploration activities, such as drilling and extraction, are extremely hazardous tasks due to the discovery and potential uncovering of various hydrocarbons such as volatile organic compounds (VOCs), polycyclic aromatic hydrocarbons, as well as Particulate Matter (PM2.5 and PM10), which are both toxic and flammable. Ensuring workers are equipped with the relevant gas detection equipment is important to ensure they are alerted to the presence of harmful gases within plenty of time to take action.
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Gas RISKS for the oil & GAS Industry
Upstream oil and gas operations such as drilling, well testing, and production, can expose workers to hazardous gases released from underground reservoirs. The main risks include flammable hydrocarbons, like methane, which can create explosive atmospheres, and toxic gases such as hydrogen sulphide, which can be dangerous even at low concentrations. These gases may be released during drilling activities, equipment leaks, or wellhead operations, making gas monitoring and strict safety controls essential to protect personnel and prevent fires or explosions.
Key gases and risks include:
- Hydrogen Sulphide (H₂S)
- Common in sour reservoirs, separators, pipelines, and tank gauging operations
- Extremely toxic at very low concentrations and can rapidly cause respiratory collapse or unconsciousness
- Significant confined-space hazard during vessel entry, pigging, and tank cleaning
- Corrosive to carbon steel, increasing the likelihood of equipment degradation, leaks, or structural failure
- Methane (CH₄)
- Primary component of natural gas encountered during drilling, production, and compression operations
- Highly flammable and capable of forming explosive atmospheres in poorly ventilated areas such as compressor buildings or cellar decks
- Ignition sources include electrical equipment, hot surfaces, and static discharge
- Can displace oxygen in enclosed spaces, creating an asphyxiation hazard
- Carbon Dioxide (CO₂)
- Found in CO₂-rich reservoirs, produced gas streams, and enhanced oil recovery (EOR) injection systems
- Heavier than air and may accumulate in pits or low-lying areas
- Non-toxic but capable of displacing oxygen and causing sudden asphyxiation
Downstream oil and gas operations, such as refining, processing, storage, and distribution, involve the handling and processing of large volumes of hydrocarbons and industrial gases. Leaks from process equipment, pipelines, or storage systems can release flammable gases and vapours, creating the risk of fires or explosions, while certain processes may produce toxic gases which pose serious health risks to personnel, if not detected quickly.
Key gases and risks include:
- Hydrogen (H₂)
- Widely used in hydrocrackers and hydrotreating units
- Extremely flammable with a wide explosive range
- Difficult to detect because the small molecules can leak easily through seals, valves, and flanges
- Burns with a nearly invisible flame, making fires difficult to detect
- Carbon Monoxide (CO)
- Produced by incomplete combustion in heaters, turbines, engines, and flaring systems
- Highly toxic and interferes with oxygen transport in the bloodstream
- Dangerous in enclosed spaces such as generator rooms or poorly ventilated work areas.
- Sulphur Dioxide (SO₂)
- Generated during flaring of sour gas or combustion of sulphur-containing fuels
- Causes respiratory irritation and lung damage
- Contributes to corrosion and degradation of plant equipment
- Hydrocarbon Vapours (e.g., Benzene, Butane, Natural Gas Liquids)
- Present in refinery streams, storage tanks, loading operations, and condensate handling
- Many are highly flammable and capable of forming vapour cloud explosions
- Some, such as benzene, are toxic and carcinogenic with long-term health risks
- Vapours may accumulate in trenches, pits, or pump rooms due to their density
Gas detectors for the oil & GAS Industry
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