Underwater separation device with pre-separation pipeline and underwater separation method thereof

Abstract

The invention discloses an underwater separation device with a pre-separation pipeline and an underwater separation method. The device comprises the pre-separation pipeline and a centrifugal separator, wherein the pre-separation pipeline comprises a main gas phase pipe, an inclined liquid phase pipe and liquid falling pipes; the main gas phase pipe comprises an inlet condensate section, a horizontal section and an outlet condensate section which are connected in sequence; the inlet condensate section extends downwards relatively to the horizontal section; the outlet condensate section extends upwards relatively to the horizontal section; the inclined liquid phase pipe is arranged below the main gas phase pipe in an inclined manner; the inlet end of the inclined liquid phase pipe is communicated with the bottom of the inlet condensate section; the liquid falling pipes are respectively arranged between the bottom of the horizontal section and the inclined liquid phase pipe and between the bottom of the outlet condensate section and the inclined liquid phase pipe; the centrifugal separator comprises a pressure vessel tank and a plurality of centrifugal separation pipes; the pressure vessel tank is divided into a gas discharging chamber, a gas inlet chamber, and a liquid discharging chamber; the plurality of centrifugal separation pipes for communicating the gas discharging chamber and the liquid discharging chamber; and a gas discharging opening of the outlet condensate section is communicated with the gas inlet chamber.

Description

technical field [0001] The invention relates to a device and method for underwater natural gas-liquid separation, in particular to an underwater separation device and method with a pre-separation pipeline. Background technique [0002] With the development of offshore oil technology, underwater natural gas fields have been continuously discovered and developed. In the development process of underwater, especially deep-water natural gas fields, problems such as high water content or high condensate content are often encountered, which is accompanied by flow safety risks in the transportation process. When the liquid content is small, hydrate inhibitors such as ethylene glycol can be injected, but when the liquid volume is relatively large, the injection of hydrate inhibitors cannot meet the flow safety requirements, which requires other methods to ensure the safety of deep-water gas fields. Mobile Security Risk. Among them, underwater separation is one of the measures. [...

AI Technical Summary

Problems solved by technology

[0003] The blade centrifugal separator is a high-efficiency separation method, but the centrifugal separator with blades has a higher separator efficiency when the droplets are relatively small, but when the droplets are large and the liquid content is relatively large, Droplet breakage, entrainment, etc. will occur, resulting in reduced separation efficiency

Therefore, the existing centrifugal separator with blades is suitable for the situation of stable working conditions, but not suitable for the current situation of large fluctuations in working conditions of deep-water natural gas fields

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