Oil-water two-phase flow measuring device and method based on combination of power rotary centrifugal differential pressure method and liquid flowmeter

Abstract

The invention discloses an oil-water two-phase flow measuring device and method based on a combination of a power rotary centrifugal differential pressure method and a liquid flowmeter; a connecting flange, an inlet pipe, a power rotating pipe, an outlet pipe and an outlet connecting flange are coaxial and are sequentially arranged from the inlet end to the outlet end; the inner diameters the inlet pipe, the power rotating pipe and the outlet pipe are the same; the liquid flowmeter is arranged on the pipe wall of the inlet pipe; bearings and a sealing box are arranged on the outer walls at thetwo ends of the power rotating pipe; a gear box is arranged on the outer wall of the middle of the power rotating pipe; a motor is arranged on the gear box; and a differential pressure sensor is connected to the outer wall of the outlet pipe. The device is used for measuring the radial centrifugal pressure difference delta P generated by high-speed rotation of the oil-water two-phase flow and themixed volume flow Qm of the oil-water two-phase flow; and then the flow Qo of the oil phase and the flow Qw of the water phase in the oil-water two-phase flow are solved. The device is wide in application range, high in measuring precision, convenient in range adjustment, safe, reliable, high in economical efficiency, compact in structure and convenient to install.

Description

technical field [0001] The invention relates to the technical field of multiphase flow measurement, in particular to an oil-water two-phase flow measurement device and method based on a combination of a dynamic rotary centrifugal differential pressure method and a liquid flow meter. Background technique [0002] The phenomenon of oil-water two-phase flow exists widely in the process of petroleum exploitation. Determining the flow rate of oil, water and water content (or oil content) in oil-water two-phase flow is the main task of oil-water two-phase measurement. Real-time measurement of oil-water two-phase flow is of great significance for predicting oil well production, predicting oil well development life, oil field production and quality control, oil well status detection, and cost reduction. It is also an inevitable requirement for digital and intelligent management of oil fields. [0003] The measurement of oil-water two-phase flow belongs to the technical category of m...

AI Technical Summary

Problems solved by technology

[0005] 1) Manual periodic sampling and analysis, through manual measurement once every hour or several hours, will cause a large difference between the actual single well production and the calculated production, plus the error of manual calculation, the final error will be quite large, The meaning of measurement is lost, and there are also problems such as low efficiency and poor real-time performance;

[0006] 2) Use a large separation tank to separate oil, gas and water and then measure them with a single-phase flowmeter. This measurement method has high initial investment costs, large volume, complex equipment, long flow stabilization time during measurement, and poor real-time measurement. And other issues;

Using this multiphase flowmeter to measure oil-water two-phase flow has the advantages of compact structure, continuous measurement, and suitable for wellhead installation. Wide range of promotion and application, because various phase holdup measurement methods have their limitations

[0008] In the Chinese invention patent applications with application numbers 201810385910.4, 201810127004.4, 201710465817.X, 201510317304.5 and 201110247206.0, the electrical method (capacitance method or conductivity method) is used to measure the phase holdup of oil-water two-phase flow. For this type of method, the sensor The nonlinearity of the response and the low resolution of the response make it difficult to meet the measurement requirements, and the conductivity method can only be applied to the oil-water two-phase flow where water is the continuous phase, while the capacitance method is only applicable to the oil-water two-phase flow where the oil is the continuous phase. Measurement accuracy is more difficult to guarantee when emulsification occurs

U.S. Patents US5689540A and US3498112A respectively introduced the method of measuring oil-water two-phase flow by ray method and microwave method. For ray method and microwave method, there are radiation pollution and safety problems, and the price is expensive, which limits their promotion and application. ; The Chinese invention patent with application number 201610519665.2 and the US patent US20180088083A1 involve a technology for measuring oil-water two-phase flow by ultrasonic method, and the Chinese invention patent with application number CN201120504236.0 involves an infrared imaging photometric method to measure the water content of crude oil For ultrasonic and optical methods, the relevant theoretical research is not enough, and the technology and process are not mature enough.

U.S. Patent US20180238819A1 introduced the method of NMR to measure oil-water two-phase flow. Although this method can obtain satisfactory measurement accuracy, its high measurement cost makes it limited to laboratory applications, and it is difficult to use it in the laboratory. Large-scale promotion of oilfield enterprises

The Chinese patent with the application number 200420022874.9 introduces a method of measuring the two-phase flow of oil and water using a Venturi tube and an elastic scraper flowmeter, but there is a pressure loss in this technology based on the two-phase flow throttling pressure drop model. Large problems that affect the transport of well produced fluids

[0009] In summary, the shortcomings of the existing oil-water two-phase flow measurement technology limit its wide-scale application in oilfield enterprises

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