On-line instant measuring method and apparatus for oil-gas-water three phase flow quantity

Abstract

The invention belongs to the metering technology category and the proposal is proposed to aim at overcoming the problems that the existing measuring facility is large and complicated in structure and difficult to realize online real-time measurement. A measuring facility of mixed fluid of oil, gas and water is composed of a vertical pipe section, a Venturi tube and a water content measuring device. The vertical pipe section is connected with a differential pressure transducer Delta P2, a pressure transducer P and a differential pressure transducer Delta P1. A cyclone and a sampling device are arranged at the position of the water content measuring device. A microwave or differential pressure type water content measuring meter is used. The cyclone throws the fluid toward the tube wall and can smoothly divert partial liquid through a sampling circular seam. Because the differential pressure function of a drainage tube can lead the liquid with the water content measured to smoothly return to a main tube, the stable liquid flow is formed, thus realizing real-time online measurement. The flow rate of each phase of the oil, gas and water can be obtained through further calculation of measured data according to a formula. The measuring facility and the measuring method are characterized by high precision, wide working range, low operating cost and stable performance and can reliably realize the real-time online measurement.

Description

Technical field: [0001] The invention belongs to the category of metering technology, and specifically relates to a metering method and device for the flow of each phase of a crude oil-natural gas-water three-phase mixture or a natural gas-condensate-water three-phase mixture. Background technique: [0002] In the production process of crude oil, crude oil is usually produced together with associated natural gas and formation water or water injection, forming oil-gas-water three-phase flow in wellheads and transportation pipelines. Similarly, during the production of natural gas, the natural gas flowing from the natural gas well often contains condensate and condensate or formation water. The measurement of the flow rate of each phase of oil, gas and water is an important production link for production calculation of each oil and gas well and block, optimization of oil and gas reservoir management, and enhanced recovery. The commonly used measurement method is to separate n...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the problems that the above measurement methods are harmful to the human body and cannot realize online real-time measurement, this solution is proposed-on-line real-time measurement method and device for oil-gas-water three-phase flow

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