What is Oilfield Gas?
Definition of Oilfield Gas
Oilfield gas refers to the gas that coexists with crude oil during petroleum extraction and is typically stored in oil reservoirs, gas reservoirs, or mixed oil and gas reservoirs. It is a vital component of the global energy supply and a significant source for the natural gas market.
Types of Oilfield Gas
The Formation Process of Oilfield Gas
The formation of oilfield gas is a long and complex geological process:
Geological Formation Process: It all begins in ancient oceans or lakes. After large quantities of organic matter like plankton and algae die, they settle at the bottom and mix with sediment to form organic-rich layers.
Decomposition of Organic Matter: Over time, as overlying sediments accumulate, the temperature and pressure in the bottom layers continuously increase. In an oxygen-deprived environment, this organic matter first transforms into a waxy substance called “kerogen”.
The Role of Heat, Pressure, and Time: As the burial depth further increases, temperature and pressure continue to rise.
Within a specific temperature and pressure range (the “oil window”), kerogen undergoes thermal cracking, generating liquid petroleum and gaseous associated gas.
If the temperature and pressure continue to rise beyond the oil window (into the “gas window”), the previously formed oil will further crack into lighter hydrocarbons, ultimately forming mainly natural gas (non-associated gas).
Composition of Oilfield Gas
| Main Component | Typical Proportion Range | Description |
| Methane (CH₄) | 70%–90% | Main fuel component |
| Ethane (C₂H₆) | 5%–15% | Chemical feedstock |
| Propane (C₃H₈) | 1%–5% | LPG (Liquefied Petroleum Gas) feedstock |
| Butane (C₄H₁₀) | 0.5%–2% | LPG component |
| Carbon Dioxide (CO₂) | 0.5%–8% | Needs to be removed to improve combustion efficiency |
| Hydrogen Sulfide (H₂S) | 0–5% | Toxic and corrosive; requires purification |
Environmental Impact of Oilfield Gas
Greenhouse Gas Emissions: Oilfield gas that is released directly without treatment emits large amounts of methane, a greenhouse gas more potent than carbon dioxide.
Gas Flaring & Venting: In oilfields lacking utilization facilities, associated gas is often burned off (flaring) or vented directly, leading to energy waste and environmental pollution.
Modern Emission Reduction Technologies
Gas Capture & Re-injection
Liquefied Natural Gas (LNG) & Compressed Natural Gas (CNG) Technologies
Carbon Capture & Storage (CCS)
Regulations and Compliance: Governments worldwide have implemented strict emission limits, such as the U.S. EPA’s methane emission standards and the European Union’s carbon tax policies, compelling oil and gas companies to increase their gas recovery and utilization rates.
KAITIANGAS: Your Professional Partner in Oilfield Gas Recovery
Established in 2002, KAITIANGAS specializes in the recovery and processing of oilfield gas resources. The company focuses on the development, engineering design, and global promotion of oilfield gas recovery and liquefaction technologies and equipment. With proprietary intellectual property, mature system solutions, and a professional team, KAITIANGAS has successfully built and operated multiple wellhead LNG recovery projects in China, the Middle East, and Southeast Asia, accumulating extensive field experience and technical advantages.
Conclusion
Oilfield gas is not only a vital part of the global energy supply but also a key source for the natural gas market. Understanding the definition, types, composition, and environmental impact of oilfield gas helps in utilizing this resource more scientifically while mitigating negative environmental effects.
Through advanced processing and recovery technologies, we can secure energy supplies while reducing greenhouse gas emissions, achieving a win-win for both energy and the environment.
Guizhou Kailin New Energy Coalbed Methane Liquefaction Project
Inner Mongolia New Energy Remote Well Liquefaction Project
Shanxi Zhonglian Coalbed Methane Gas Well Liquefaction Project
