Exploration – The exploration of the Natural gas involves the searching for its occurrence under the ground or under the sea. The natural gas reserves are usually found in those places where there are impermeable rocks known as cap rocks that restrict the upward movement of gas via underground soil and rocks. The seismology is a technique employed by the geologists and geophysicists for searching areas that have the suitable conditions for a gas or oil deposit. In addition to that, there are high-speed computers that develop the three-dimensional underground maps.  The satellite image technology is also used widely for searching the natural gas reservoirs.

Those areas that have large reservoirs of natural gas are called as gas fields. Some of the famous gas fields of the world include North Field in Qatar.  Those gas fields that occur in underwater gas reservoirs are called as offshore fields such as North Sea, the Persian Gulf and the Gulf of Mexico.

Extraction – Once the gas field is explored, the next step is extraction of the gas from the field. The extraction of the gas from the field involves the drilling of the production wells for confirming the existence of a reservoir, its size and subsequent extraction of the gas. Once a gas well is found and it is drilled to the required www.cng.in.ebozavr.com depth, the gas rises automatically to the surface due to its own 4seohunt.com/www/www.cng.in pressure . The gas flow rate decreases over time and it is maintained by drilling the reinjection wells and using the gas compressors for re injecting the compressed gas in downward direction into the reservoir.

With the continuous extraction of the gas from the field, there is subsequent decline in the pressure of underground gas reservoir. When the pressure is decreased to a point below the hydrocarbon dew point, there is condensation of the hydrocarbons like propane, butanes, pentanes and higher molecular weight hydrocarbons into the liquids. The formation of liquid hydrocarbons that takes place in a gas reservoir is known as retrograde condensation. It happens because some quantity of gas condenses into a liquid on decreasing the pressure under isothermal conditions. In order to resolve this, the dried gas is injected that helps in maintaining the underground pressure and allow the extraction of the gas from the condensed matter.