Underwater combined natural gas-liquid separation device and method

Abstract

The invention discloses an underwater combined natural gas-liquid separation device and method. The underwater combined natural gas-liquid separation device is characterized by comprising an air inlet line and a plurality of separator single pipes, wherein a plurality of air inlet branch lines are arranged at an outlet end of the air inlet line; each separator single pipe is sequentially partitioned into an exhaust chamber, a liquid collecting chamber, an air inlet chamber and a drainage chamber through a first partition plate, a second partition plate and a third partition plate from top to bottom, and valves are arranged on the first partition plates and the third partition plates separately; a liquid guide pipe for communicating the corresponding liquid collecting chamber and drainage chamber is arranged in each air inlet chamber; a cyclone core tube for communicating the corresponding exhaust chamber and air inlet chamber is arranged in each liquid collecting chamber; and each air inlet branch line on the air inlet line is connected with the air inlet chamber of each separator single pipe.

Description

Technical field [0001] The invention relates to a natural gas gas-liquid separation equipment and method, in particular to an underwater combined natural gas gas-liquid separation device and method. Background technique [0002] With the advancement of technology and the international community’s demand for natural gas energy, natural gas development has moved from land to underwater, from shallow water to deep water. Natural gas development is generally accompanied by natural gas condensate and water. Natural gas condensate and water can cause flow safety risks during natural gas transportation, especially long-distance tie-back transmission or riser tie-back deepwater platforms. For gas fields with less water production, hydrate inhibitors such as ethylene glycol can be injected underwater, and then transported to the platform for natural gas gas-liquid separation treatment; for high water-cut gas fields, not only is the demand for hydrate inhibitors high and the cost is high, ...

AI Technical Summary

Problems solved by technology

[0003] Compared with separators used on land or on platforms, underwater separators have to bear a lot of external pressure. If the diameter of the separator cavity is the same as that on land, the wall thickness will be very thick, which is not only expensive, but also gives Construction, installation, etc. bring a lot of inconvenience, resulting in excessive investment in the overall project cost

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