Low-pressure natural gas recovering system for offshore gas field

Abstract

The invention discloses a low-pressure natural gas recovering system for an offshore gas field. In the low-pressure natural gas recovering system for the offshore gas field, a gas phase outlet of a high-pressure oil-gas-water separator is communicated with a dry gas compressor, an oil phase outlet of the high-pressure oil-gas-water separator is communicated with a low-pressure oil-gas-water separator, a gas phase outlet of the low-pressure oil-gas-water separator is respectively communicated with a fuel system and a wet gas compressor, and an oil phase outlet of the low-pressure oil-gas-water separator is communicated with a condensate oil buffer tank; a material flow from a low-pressure well mouth of the gas field at sea is input into the low-pressure oil-gas-water separator or the condensate oil buffer tank; the gas phase outlet of the condensate oil buffer tank is sequentially communicated with a low-pressure gas cooler, a low-pressure gas hydrocyclone, a low-pressure gas booster compressor and a low-pressure gas aftercooler. The low-pressure natural gas recovering system for the offshore gas field is mainly used for recovering and using natural gas, which is low in pressure or micro in positive pressure or small in flow quantity, in the gas filed at sea, so that the emptying quantity of the gas field is reduced, and energy conservation and emission reduction are achieved.

Description

technical field [0001] The invention relates to a low-pressure natural gas recovery system in an offshore gas field. Background technique [0002] In the development process of the offshore oil industry, the main process of the offshore gas field usually needs to be equipped with the following process systems: high-pressure separator, low-pressure separator, condensate oil buffer tank, wet gas compressor, triethylene glycol dehydration system, dry gas compressor etc., such as figure 1 shown. This type of gas field mainly focuses on the development of natural gas. Usually, in the initial stage of gas field development, the pressure of the stream coming from the wellhead is relatively high. After passing through the high-pressure separator, the gas phase stream enters the triethylene glycol dehydration system, and then is pressurized by a dry gas compressor. External transport; the liquid phase and a small amount of gas phase enter the low-pressure separator after passing th...

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Problems solved by technology

From the above description, it can be concluded that in the development of the offshore oil industry, there are two deficiencies in the development of gas fields by adopting conventional processes: one is that the relatively small amount of low-pressure gas behind the condensate buffer tank cannot be used in time; the other is that Due to the high inlet pressure requirements of the wet gas compressor, the development life of some gas wells is affected

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