Separator and phase-split conveying method for eliminating plug flow on serious segments by utilizing same

Abstract

Separator and phase-split conveying method for eliminating plug flow on serious segments by utilizing same. The separator includes housing, collecting pipe and escape pipe connecting to the housing. The housing sets liquid level sensor and pressure sensor and has rising pipe which extends to the bottom of the housing. The extending part of the rising pipe sets the liquid phase pump connecting to the rising pipe by valve. The control valve is installed on the gas rising pipe closed the housing outlet. The inventive separator is installed at the connection section of the gas-liquid mixed transportation pipe and rising pipe and regulates the opening size of the control valve by controlling the liquid level signal and pressure signal to stabilize the liquid level and pressure. The liquid enters into rising pipe after the separation of the gas-liquid in the separator. The gas enters into the rising pipe through control valve and escape pipe. The liquid is mixed in the rising pipe and flows to the shore platform. The invention accurately controls the gas-liquid flow and eliminates the plug flow on serious segments.

Description

technical field [0001] The invention relates to a separator and a method for eliminating severe slug flow by using the separator, in particular to a separator for mixed transportation of oil and gas and a seabed separation and phase-separation transportation method for eliminating severe slug flow by using the same. Background technique [0002] In offshore oil exploitation, it is often encountered that gas and liquid are transported at the same time. When the multi-phase gathering and transportation pipeline on the seabed reaches the offshore platform or onshore processing facility, it needs to be connected with the riser. Under certain conditions, the gathering and transportation pipeline and A detrimental flow pattern known as severe slug can occur in systems consisting of risers. This flow pattern will produce a liquid plug several times the height of the riser, which will cause periodic changes in the pressure in the gathering pipeline, thereby affecting the wellhead pr...

AI Technical Summary

Problems solved by technology

This flow pattern will produce a liquid plug several times the height of the riser, which will cause periodic changes in the pressure in the gathering pipeline, thereby affecting the wellhead pressure, and will also cause the gas and liquid to flow out intermittently at the outlet of the riser, causing the gas to spray at a high speed in a short period of time. out, causing the outlet liquid plug to enter the separator at high speed, and the severe slug flow phenomenon brings many problems to the design and production

As production facilities had to be scaled up, some separators were rated far greater than the actual liquid handling capacity, resulting in waste, and severe flow fluctuations also made it difficult to control separators and downstream processing facilities, sometimes even causing production interruptions

[0003] Chinese patent CN1387617A "Method and system for suppressing and controlling slug flow in multiphase fluid flow" (publication date: December 25, 2002) and US patent US6390114B1 "Method and apparatus for suppressing and controlling slug flow in a multi- phase fluid stream" (publication date: May 21, 2002) announced a severe slug flow suppression method, which uses easy-to-implement gas-liquid single-phase flow measurement combined with multiple control variables such as liquid level and pressure to control Realize the control of severe slug flow; British patent GB2374161A "Gas injection controlling liquid slugs inpipeline riser" (publication date: October 9, 2002) announced a serious slug flow control method of gas injection at the bottom of the riser, However, experiments have shown that this method requires a large amount of gas injection to completely eliminate severe slug flow, and can only weaken severe slug flow when the gas injection amount is small

The above methods only achieve the effect of weakening severe slug flow, but they have not fundamentally eliminated the conditions for severe slug flow

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