Natural gas recovery process

Abstract

The invention discloses a natural gas recovery process. The light hydrocarbon recovery rate can be improved, and energy consumption can be reduced by the natural gas recovery process. The process comprises the following steps of separating and filtering the material gas by a separator and a filter orderly, entering into a compressor to compress, air cooling, and then separating a part of water and heavy hydrocarbon through the separator; deeply dewatering through a dehydration unit until the moisture is smaller than 10ppm; filtering, pre-cooling to -10 DEG C through a heat exchanger, cooling to -35 DEG C by a refrigerator, then cooling and separating, and reheating the separated mixed hydrocarbon to normal temperature through the heat exchanger and then conveying to a mixed hydrocarbon storage tank; returning the separated gas to the heat exchanger to exchange heat; reheating the gas to the normal temperature, and then entering a CNG (compressed natural gas) to compress and store. By adopting the process, the material gas with low air pressure and unstable storage quantity can be collected; and the natural gas recovery process is high in recovery rate, low in recovery cost, simple in recovery equipment, simple and convenient to operate, and low in energy consumption.

Description

technical field [0001] The invention relates to a recovery process of natural gas as a raw material, in particular to a recovery process which is simple in process and capable of simultaneously recovering light hydrocarbons and natural gas. Background technique [0002] It is well known that for the natural gas in remote scattered wells, due to the small gas volume and dispersion, it is not convenient to build pipelines for centralized processing, and most of the wells cannot be exploited after exploration. Many scattered wells have low air pressure and unstable reserves, which is not convenient to build fixed equipment for mining; a small amount of gas sources with certain pressure and high content of heavy components are often dehydrated with triethylene glycol, and throttle valves are used to throttle the flow by using the pressure of raw gas Decrease the pressure and lower the temperature to collect mixed hydrocarbons. After the hydrocarbons are collected, the natural ga...

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Problems solved by technology

[0002] It is known that for the natural gas in remote scattered wells, due to the small gas volume and dispersion, it is not convenient to build pipelines for centralized processing, and most of the wells cannot be exploited after exploratory wells

Many scattered wells have low air pressure and unstable reserves, which is not convenient to build fixed equipment for mining; a small amount of gas sources with certain pressure and high content of heavy components are often dehydrated with triethylene glycol, and throttle valves are used to throttle the flow by using the pressure of raw gas Decrease the pressure and lower the temperature to collect mixed hydrocarbons. After the hydrocarbons are collected, the natural gas cannot be further formed into products because the water dew point and hydrocarbon dew point are not up to the standard; affect production

In addition, many oil and gas treatment devices have natural gas that is vented and burned. On the one hand, it pollutes the environment and on the other hand causes energy waste. Enterprises bear a double economic burden

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