Gathering and transportation standpipe system gas-liquid two-phase flow pattern judgment method and system
A gas-liquid two-phase flow and flow pattern technology, which is applied to the measurement of fluid pressure, character and pattern recognition, and measurement devices, can solve problems such as the inability to improve the safety and efficiency of offshore exploration, and the inability to identify flow patterns
Pending Publication Date: 2017-07-14
CHINA UNIV OF PETROLEUM (EAST CHINA)
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[0004] Existing flow pattern recognition patents include the following: Chinese invention patent (publication number CN102878431B), Chinese invention patent (publication number CN104807589A) and Chinese invention patent (publication number CN105823617A), which respectively use a single pressure sensor at the pipeline inlet and a pressure sensor at the top of the pipeline. Sensors and the gas-liquid two-phase flow pattern of the gathering riser system Three different pressure sensors at different positions are used to distinguish the flow pattern. Although the above-mentioned patents can identify the flow pattern of the standpipe, they cannot Carrying out finer classification identification cannot improve the safety and efficiency of offshore exploration
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[0037] It should be pointed out that the following detailed description is exemplary and intended to provide further explanation to the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
[0038] It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and / or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and / or combinations thereof.
[0039] A typical embodiment of the present invention is figure 1 Shown: A flow pattern discrimination system fo...
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The invention discloses a gathering and transportation standpipe system gas-liquid two-phase flow pattern judgment method and system. The method comprises the following steps that (1) differential pressure signals of the top part and the bottom part of a standpipe are collected; (2) the differential pressure signals are filtered and dimensionless processing is performed; (3) the statistical and time frequency characteristics of the differential pressure dimensionless signals are analyzed by using statistics and time frequency analysis, wherein the statistical characteristics include a differential pressure signal probability density function and a cumulative distribution function, and the time frequency characteristics include the time domain value and the power spectrum density of the differential pressure signals; and (4) flow pattern judgment is performed according to the statistical and time frequency characteristics. The flow pattern of the gathering and transportation standpipe system can be divided through a differential pressure signal curve and the corresponding statistical and time frequency characteristics, and the detailed flow pattern can be obtained so that a new idea of gathering and transportation standpipe flow pattern judgment is provided, and the method and the system have an important meaning for safe production of the ocean standpipe system.
Description
technical field [0001] The invention relates to a system and a method for discriminating the gas-liquid two-phase flow pattern of a standpipe gathering and transportation system, and belongs to the technical field of multiphase flow detection in petroleum engineering. Background technique [0002] With the depletion of land oil and gas resources, the development of offshore oil and gas resources is increasing. The ocean has become an important potential area for the development of oil and gas resources in my country. In offshore oil and gas exploitation, considering the harsh natural environment and economical and environmental considerations, it is often inappropriate to install a gas-liquid separator on site or lay two pipelines to transport oil and gas separately. Products such as natural gas and water are lifted from the seabed to floating devices on the sea surface. Gathering riser system is the basic device for floating production system to transfer fluid to ships or...
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Login to View More IPC IPC(8): G06K9/00G01L13/00
CPCG01L13/00G06F2218/00G06F2218/06
Inventor 胡其会王权刘昶王琳李玉星
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)