Method and system for measuring water content of crude oil by using Rayleigh scattering principle
A technology of Rayleigh scattering and water content, which is applied in the direction of material analysis using radiation diffraction, etc., can solve problems such as the limited measurement range of the capacitance method, the difficulty of measuring the capacitance, and the inability to meet the needs of oil fields
Inactive Publication Date: 2011-08-17
ZHEJIANG UNIV
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Problems solved by technology
In this case, the two electrodes of the capacitor are short-circuited by the conductive water, making the required capacitance difficult to measure
Therefore, the measurement range of the capacitance method is very limited, and it has been unable to meet the needs of various domestic oil fields.
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[0038] A digital processor can be implemented with an embedded processing system based on a microprocessor, DSP, or FPGA.
[0039] The digital-to-analog converter can choose AD9755 produced by Analog Devices. The chip is a dual-channel 14-bit digital-to-analog converter with a conversion rate of 300MSPS.
[0040] The local oscillator can choose the ADF4360 series produced by Analog Device Company. Its operating frequency can be selected from 65MHz to 2.7GHz. This series of chips has a three-wire serial interface, which can be programmed through a digital processor to determine its final output frequency and output power.
[0041] The mixer can choose SYM-25DHW. The input frequency of the local oscillator port is 80MHz to 2.5GHz, the baseband signal input frequency ranges from DC to 1GHz, and the conversion loss is about 8dB.
[0042] The directional coupler can choose XKDC1020-10 produced by Xike Microwave Company, its operating frequency range is 1GHz-2GHz, and the output...
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The invention discloses a method and a system for measuring water content of crude oil by using a Rayleigh scattering principle. A digital processor controls a digital-to-analog converter to generate swept signals; and the swept signals and carrier signals generated by a local oscillator are mixed to generate emission signals. The emission signals pass through a first directional coupler, a part of energy flows to a first power detector, and the rest energy is radiated to an oil and water mixture through a second directional coupler and a probe; Rayleigh scattering phenomenon is generated by the action of oil drop small particles in the mixture and incident electromagnetic waves; and the probe receives scattered waves back to the second directional coupler, and couples scattered energy toa second power detector. The digital processor controls a double-channel analog-to-digital converter to acquire the output of the two power detectors, and calculates the water content of the crude oil according to the intensity of emission waves and the scattered waves; and the water content of the crude oil is output through a communication interface module. When the water content of the crude oil is higher than 70 percent, the method and the system still precisely measure the water content of the crude oil, and can be used for measuring water content of crude oil in producing wells and the change of water content of crude oil in different stratums.
Description
technical field [0001] The invention relates to a method and a system for measuring the water content of crude oil by using the Rayleigh scattering principle. Background technique [0002] Oil is an important strategic resource. Accurate measurement of water cut in oil reservoir is of great significance to the production of oil wells. The traditional measurement of water content of crude oil is mostly based on the capacitance method. The basic principle is to put a metal capacitor structure into the production layer of the production well, let the oil-water mixture in the oil well enter the above-mentioned container, and then measure its capacitance. Because the measured capacitance is related to the dielectric constant of the oil-water mixture, and the relative permittivity of water is 81 and the relative permittivity of oil is 2~4. Therefore, the oil-water ratio can be inversely calculated from the capacitance to calculate The moisture content of crude oil. [0003] How...
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IPC IPC(8): G01N23/20
Inventor 冉立新王静雨
Owner ZHEJIANG UNIV