Sour Gas

Sour gas is natural gas or any other gas containing significant amounts of hydrogen sulfide (H2S). Natural gas is usually considered sour if there are more than 5.7 milligrams of H2S per cubic meter of natural gas, which is equivalent to approximately 4 ppm by volume under standard temperature and pressure. However, this threshold varies by country, state, or even agency or application. For instance, the Texas Railroad Commission considers a sour gas pipeline one that carries gas over 100 ppm by volume of H2S. However, the Texas Commission on Environmental Quality has historically defined sour gas for upstream operations – which requires permitting, reporting, and possibly additional emission controls – as gas that contains more than 24 ppm by volume. Natural gas that does not contain significant amounts of hydrogen sulfide is called "sweet gas."

Although the terms acid gas and sour gas are sometimes used interchangeably, strictly speaking, a sour gas is any gas that specifically contains hydrogen sulfide in significant amounts, whereas an acid gas is any gas that contains significant amounts of acidic gases such as carbon dioxide (CO2) or hydrogen sulfide. Thus, carbon dioxide by itself is an acid gas, not a sour gas. In addition to being toxic, hydrogen sulfide in the presence of water also damages piping and other equipment handling sour gas by sulfide stress cracking. Natural gas can contain several ppm of volatile sulfur compounds, but gas from some wells have been known to contain 90% hydrogen sulfide.

Read more about Sour Gas:  Methods For Sweetening

Other articles related to "sour gas, gas":

Wiebo Ludwig - Confrontations With The Oil and Gas Industry - AEC West Bombings
... In the early 1990s oil companies in northern Alberta began building sour gas wells on land they owned near Trickle Creek ... Ludwig linked the flared gas and leaks from the wells with stillbirths, deformations, and miscarriages that began to occur in the community at the time, and began to protest ... He appealed to the government to regulate sour gas extraction near the community, but the government did not respond ...
Hydrodesulfurization - Process Description
... pressure and is joined by a stream of hydrogen-rich recycle gas ... The resulting liquid-gas mixture is preheated by flowing through a heat exchanger ... The resulting mixture of liquid and gas enters the gas separator vessel at about 35 °C and 3 to 5 atmospheres of absolute pressure ...
Black Powder In Gas Pipelines - Sources
... Carryover from gas gathering systems ... Sour gas pipelines are always treated with corrosion inhibitors, while sweet gas pipelines are not ... The rate of inhibition in sour gas lines is designed for normal operation, but there is always a chance of plant upsets that might introduce water to the pipelines ...
History Of The Petroleum Industry In Canada (natural Gas) - Gas Conservation After Leduc
... after the Leduc discovery, the Conservation Board acted to prevent any repetition of the natural gas waste so common in Turner Valley ... The board developed a broad conservation policy for natural gas ... It prohibited producing natural gas from an oil reservoir's gas cap before the oil was fully produced, and included provisions aimed at conserving ...
Sour Gas - Methods For Sweetening
... Before a raw natural gas containing hydrogen sulfide or carbon dioxide can be used, the raw gas must be treated to remove those impurities to acceptable levels, commonly by an amine gas treating process ... Alternatively, the highly H2S concentrated gas, the by-product of the amine treatment plant, can be recompressed by compressor units specifically designed to handle highly toxic gas and ... Within oil refineries or natural gas processing plants, the removal of organosulfur compounds and hydrogen sulfide is referred to as "sweetening" ...

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