Technical English language

6. Requirements for tanks and gas storage parks
Metal tanks for gas storage provide an opportunity for 100% of consumers to use natural resources. And it does not really matter what time of year, temperature fluctuations. At the same time, the unexpected occurrence of force majeure does not play a role.
The storage of gas requires significantly more volume than a solid or liquid. Therefore, the most difficult task is to find sealed tanks, storage tanks for liquefied gas and other products. But nature in this case served as a good helper and already built them. Natural here are porous strata of sandstone in the earth's crust, hermetically sealed from above by a dome from a layer of clay. In the pores of the sandstone, water can be found, just as hydrocarbons can accumulate there.
To determine whether a reservoir is a reservoir of gas and oil, it is necessary to check initially whether there are hydrocarbons in it. Thus, the tightness of this structure is already proved by the fact that hydrocarbons accumulated in it.
At the time of formation of the storage, part of the gas is closed in the reservoir reservoir in order to create the required pressure. Such a gas is called a buffer gas. The volume of the buffer gas is almost half of the total gas pumped into the storage. The gas that will be used for extraction from the gas storage park is called active or working gas.
Parks that are in a depleted field or aquifer have a difference, expressed in large volumes and in little flexibility. Many times faster injection and selection of gas are carried out in storage facilities, which are located in caves of rock salt.
7.Gas injection for storage
Gas injection is a system of actions aimed at filling an artificial gas reservoir with gas at the indicated by the technological project indicators. Gas, which comes from the main gas pipeline, goes to the specified place of purification from mechanical impurities, and then goes to the point of metering and recording, only after that it goes to the compressor shop.
The piping of the production lines allows to measure the productivity of each well, the temperature and pressure of the gas during injection.
The process of pumping out of the underground gas storage tank has an analogy with the same technological process as extraction from gas fields, but there is one significant difference: all active (commodity) gas is taken for a period of 60 to 180 days. The maximum purified and drained resource is sent to the main transport systems.