What are rich gas and dry gas?

Petroleum gases are generally classified into three categories based on the content of heavy gases such as those with three or more carbon atoms: Gases with a content of heavy gases like those with three or more carbon atoms of 150 grams per cubic meter or more are referred to as rich gases. Gas with a content of less than 50 grams/m3 is called dry gas. A content of 50–150 grams/m3 is referred to as lean gas.

These terms are clearly defined in the basic concepts of oil field development, but in SY/T0049-2006 \"Planning and Design for Onshore Oil and Gas Field Facilities\", sections 3.44–3.45 define them as follows: 1. Wet gas: Natural gas in which the amount of pentane and heavier hydrocarbon components per cubic meter, expressed in liquid volume, is greater than 10 mL. 2. Dry gas: Natural gas in which the volume of pentane and heavier hydrocarbon components, expressed in liquid form, is less than 10 mL per cubic meter of gas. In the textbook \"Oil and Gas Gathering, Transportation, and Field Processing\", it is stated that: 1. Wet gas: gas-oil ratio greater than 8905 M3/M3; 2. Dry gas: natural gas free of liquids. Based on the volume of liquid that can be recovered from 1 m3 of natural gas at 1 atmosphere pressure and 15 degrees Celsius, natural gas is classified into three types: lean gas, rich gas, and very rich gas. If ethane and components heavier than ethane (C2+) are considered as recoverable liquids, then the volume for lean gas is less than 0.3344 L/m3 ； The rich gas volume is 0.3344~0.6688 L/m3 ； Very high gas density > 0.6688 L/m3. (Excerpted from \"Oil and Gas Gathering, Transportation, and Field Processing\") Based on the content of components in natural gas above propane (also known as heavier hydrocarbons), it is divided into dry gas and wet gas. Dry gas, also known as lean gas, is primarily composed of methane, containing only small amounts of ethane, and has no or only trace amounts of heavier alkanes. Moist gas, also known as rich gas or fatty gas, is primarily composed of methane and ethane, but it also contains a considerable amount of liquid heavy hydrocarbons. Those with a heavy hydrocarbon content of ≥5% are referred to as wet gas or rich gas ； Gas with a heavy hydrocarbon content of <5% is called dry gas or lean gas.

Rich gas is also known as wet gas, with high levels of carbon tiers 3 and 4; dry gas is referred to as lean gas, with very low levels of carbon tiers 3 and 4.

You’ve heard of dry gas, right? So you can then figure out what rich gas is.

Catalyzed rich gas usually refers to components below C4, while dry gas refers to C1/C2 components

Natural gas associated with oil fields, after undergoing dehydration, purification, and light hydrocarbon recovery processes to yield liquefied gas and light oils, is referred to as dry gas when its main component is methane. Generally, natural gas with a methane content of over 90% is referred to as dry gas. Gas with a methane content of less than 90%, and an alkane content such as that of ethane and propane of over 10%, is called wet gas. Natural gas is classified into lean gas and rich gas depending on its composition; lean gas contains a higher proportion of methane, while rich gas has higher levels of ethane, propane, and butane