Measurement device and method for multi-phase interface liquid level based on dual-modality sensor

Abstract

The invention belongs to the technical field of multi-phase interface liquid level measurement and relates to a measurement device for a multi-phase interface liquid level based on a capacitance / resistance-type dual-modality sensor, which is used for measuring a liquid level of a multi-phase interface. The measurement device comprises an upper computer, a signal generation unit, a power amplifier, an analog multi-way switch, a capacitance / resistance-type dual-modality sensor and a signal collection unit. The invention is characterized in that the capacitance / resistance-type dual-modality sensor comprises an array of electrodes which are distributed in N rows and three columns on the same plane, and N is an integer larger than or equal to 3, wherein the electrodes in the first column and in the second column are all rectangular electrodes, the electrodes in the third column are round in shape, the size of the electrodes in the third column is smaller than that of the electrodes in the first column and in the second column, the electrodes in the same column are made of the same material and have the same size, and the distances between two electrodes in the same column are the same.The invention also provides a measurement method for measuring the multi-phase interface liquid level by use of the measurement device. The device has a simple and reliable structure, is convenient for installation, is not liable to be blocked by the viscose crude oil, and can achieve the accurate measurement of the liquid level of the multi-phase interface.

Description

technical field [0001] The invention belongs to the technical field of multiphase interface liquid level measurement, and relates to a measurement system based on a capacitance / resistance dual-mode sensor. Background technique [0002] The crude oil directly extracted from the oil well contains a large amount of water, sediment and natural gas, and through the separation of the three-phase separator, several interfaces such as sediment / water, water / oil, natural gas / oil, etc. will be formed in the oil storage tank . In order to determine the amount of crude oil in the oil storage tank, it is necessary to first measure the upper and lower liquid levels of the crude oil in the oil storage tank. Obviously, in order to achieve this goal, it is necessary to design a multi-interface measurement and control system. [0003] At present, the traditional capacitive liquid level measurement system can only detect the position of a single interface. When detecting the position of multi...

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Problems solved by technology

[0003] At present, the traditional capacitive liquid level measurement system can only detect the position of a single interface. When detecting the position of multi-phase interface at the same time, only one pair of electrodes cannot achieve the goal.

Using the multi-electrode sensor structure (plus references), it is theoretically possible to distinguish the gas / oil / water interface, but the water directly produced from the oil well is mainly seawater, which has a high conductivity (up to 5 simon / m ), due to the conductive short-circuit effect of water, its capacitance measurement value is not proportional to the dielectric constant of water, and is often much smaller than the theoretical value, so the capacitance measurement in practice cannot accurately distinguish the seawater / oil interface

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