Adaptive estimation method of water cut in oil-water two-phase flow

A technology of self-adaptive estimation and moisture content, applied in material resistance and other directions, can solve problems such as heavy computational burden, limited accuracy, and inapplicability to long-term estimation processes, achieving small computational load, improving estimation accuracy, and realizing real-time online estimation Effect

Active Publication Date: 2018-11-09
TIANJIN UNIV
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Problems solved by technology

The least squares estimation is usually applied to the estimation of random vectors and constant value vectors. The algorithm structure is simple but the accuracy is limited; the linear minimum variance estimation uses the smallest mean square error as the optimization parameter, which is suitable for stationary processes. The richer the measurement information is, the higher the estimation accuracy is. High, the greater the amount of calculation, and with the accumulation of the estimation process, resulting in a heavy calculation burden, it is not suitable for complex and long-term estimation processes

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  • Adaptive estimation method of water cut in oil-water two-phase flow
  • Adaptive estimation method of water cut in oil-water two-phase flow
  • Adaptive estimation method of water cut in oil-water two-phase flow

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[0043] When the signal frequency is between 10kHz and 100kHz, the load characteristic of the oil-water two-phase flow is resistive, that is, the voltage between the electrode pairs is proportional to the fluid impedance distributed therebetween. When the oil-water two-phase flow fluid can form a circuit, the impedance of the oil-water two-phase flow has a corresponding relationship with the phase distribution, so the phase holdup can be measured by measuring the voltage between the electrode pairs.

[0044] The calculation method of the present invention will be described below in conjunction with the drawings in the description.

[0045] figure 1 Schematic diagram of the sensor measurement space. The physical picture of the conductivity sensor is as follows: figure 1 As shown, the detailed process is as follows figure 2As shown, it consists of six annular electrodes arranged in the axial direction, among which 1, 6 are excitation electrodes, and 2, 3, 4, 5 are measurement...

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Abstract

The invention relates to an adaptive estimation method for water content of an oil-water two-phase flow, the method includes time registration of measurement data from upper and lower streams of a conductance sensor; state estimation based on adaptive update; judgment on whether the oil-water two-phase flow is in a water continuous sate; and kalman state estimation and updating of a water content measured value of the sensor. The adaptive estimation method can improve the estimation precision of the water content.

Description

technical field [0001] The invention belongs to the technical field of fluid measurement, and uses a conductance sensor and an adaptive Kalman algorithm to measure water content information to improve the estimation accuracy of water content in two-phase flow. technical background [0002] Two-phase flow widely exists in daily life and industrial production processes, such as food processing, bioengineering, chemical industry, metallurgical industry and petroleum industry and other industries. Compared with general single-phase flow, the flow state of two-phase flow is more complex and modeling is more difficult. Therefore, the online process parameter detection of two-phase flow has always been the difficulty and focus of the academic and industrial circles. Especially in the petroleum industry, the water cut of oil-water two-phase flow is of great significance to oil well monitoring, production prediction and production planning. [0003] At present, the measurement metho...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/08
CPCG01N27/08
Inventor 谭超付广智董峰
Owner TIANJIN UNIV
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