A dual-nozzle-based on-line measurement method for oil well multiphase fluid fractional holdup

A metering method and multiphase flow technology, applied in the field of multiphase flow metering, can solve the problems of high gas content and lack of adaptability, and achieve the effects of small footprint, improved accuracy, and convenient installation

Active Publication Date: 2020-07-31
CHINA UNIV OF PETROLEUM (BEIJING) +1
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

Lack of adaptability especially for low flow and high gas content working conditions

Method used

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  • A dual-nozzle-based on-line measurement method for oil well multiphase fluid fractional holdup
  • A dual-nozzle-based on-line measurement method for oil well multiphase fluid fractional holdup
  • A dual-nozzle-based on-line measurement method for oil well multiphase fluid fractional holdup

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Embodiment Construction

[0057] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further clarified below in conjunction with specific drawings.

[0058] to combine figure 1 Shown is a schematic diagram of an on-line metering method for oil well multiphase fluid phase holdup based on dual nozzles provided by the present invention, such as the first nozzle throttling member 5 and the second nozzle throttling member 6 connected in sequence, and the The first high-precision differential pressure gauge 2 at both ends of the first nozzle throttling member 5, and the second high-precision differential pressure gauge 3 arranged at both ends of the second nozzle throttling member 6;

[0059] An integrated temperature and pressure sensor 1 is provided at the end of the first nozzle throttling element 5 away from the second nozzle throttling element 6;

[0060] A radio frequency moisture meter 4 is prov...

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Abstract

The invention belongs to the technical field of multiphase flow metering and particularly relates to a double-nozzle based online calculation method of oil well multiphase flow split-phase content. The method comprises steps as follows: (1) acquiring an instantaneous differential pressure value of two nozzles; (2) calculating a standard difference of differential pressure signal fluctuations; (3)performing dimensionless processing on the standard difference; (4) fitting a related expression of a dimensionless parameter Z1 with air content and a Reynolds number; (5) fitting a related expression of a dimensionless parameter Z2 with air content and a Froude number; (6) performing simultaneous processing on the related expressions to obtain a related expression of the air content and the dimensionless parameters; (7) obtaining water content W through a radio frequency water content measuring device; and (8) calculating total flow by use of a multiphase flow split-phase model. By means ofthe provided calculation method, flowing influences are considered by adding the Reynolds number and the Froude number, and the calculation accuracy is ensured.

Description

technical field [0001] The invention belongs to the technical field of multiphase flow measurement, in particular to an on-line measurement method for phase separation holdup of oil well multiphase flow based on double nozzles. Background technique [0002] In the original production process, in order to understand the change of oil and gas content in the formation, it is necessary to continuously measure the holdup and flow rate of each component in the oil well output fluid and provide real-time measurement data. [0003] At present, crude oil measurement methods include manual measurement and online measurement. Manual metering is simple to operate, but has disadvantages such as poor sampling representativeness, poor continuity, and time-consuming, which cannot meet the needs of oilfield production automation management; online metering can improve oilfield production automation and realize real-time monitoring functions, but most of the current products have poor applica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01F1/34G01N33/28
CPCG01F1/34G01N33/2835
Inventor 檀朝东张紫琴吴浩达檀朝銮张倩魏方方
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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