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Online measurement method and device for flow of three phases including crude oil, natural gas and water

A natural gas and water three-phase technology, which is applied in the direction of measuring devices, detecting fluid flow by measuring pressure difference, volume/mass flow generated by mechanical effects, etc., can solve problems such as difficulty in flow measurement, and achieve high measurement accuracy and no fragility New effect of parts and measurement methods

Active Publication Date: 2018-11-06
陕西敬信义能源科技有限公司
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Problems solved by technology

Such flow patterns make flow measurement more difficult

Method used

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  • Online measurement method and device for flow of three phases including crude oil, natural gas and water
  • Online measurement method and device for flow of three phases including crude oil, natural gas and water
  • Online measurement method and device for flow of three phases including crude oil, natural gas and water

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Embodiment Construction

[0026] This example presents a method for online measurement of crude oil / natural gas / water three-phase flow by frequency conversion heating at the wellhead of crude oil. First, the heater is used to heat the three-phase mixture fluid of crude oil, natural gas and water to the required temperature, and the heating amount is calculated to obtain the three-phase flow rate. The average specific heat and phase ratio of the phase mixture fluid, the average density of the three-phase mixture fluid of crude oil, natural gas and water is measured by the venturi tube in the inverted U-shaped tube; the total density of the three-phase mixture fluid of crude oil, natural gas and water is measured by the horizontal venturi tube Volume flow rate; by calculating the mixture density, phase ratio and total volume flow rate simultaneously, the flow rate of each phase of crude oil, natural gas and water in the three-phase mixture fluid of crude oil, natural gas and water can be calculated.

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Abstract

The invention discloses an online measurement method and device for the flow of three phases including crude oil, natural gas and water. According to the method, firstly, a three-phase mixture fluid of the crude oil, natural gas and water is heated to demanded temperature, the heat quantity is calculated, and the average specific heat and phase ratio of the three-phase mixture fluid are obtained.A Venturi tube in an inversely U-shaped pipe is used for measuring the average density of the three-phase mixture; a horizontal Venturi tube is used for measuring the total volume flow of the three-phase mixture fluid. Through combined calculation of the density, phase ratio and total volume flow of the mixture, the flow of the crude oil, natural gas and water can be figured out separately. By means of the online measurement method and device for the flow of the three phases including the crude oil, the natural gas and the water, the difficulty in measurement of the flow of the crude oil is solved, and the efficiency of heating a crude oil wellhead is improved. The measurement method is novel, unique and scientific, and the measurement device is reliable, free of components which are likely to be damaged, high in measurement precision and reliable in data.

Description

technical field [0001] The invention belongs to the technical field of measurement of petroleum production, relates to a measurement method and a device, and further relates to a method and a device for online measurement of crude oil / natural gas / water three-phase flow. Background technique [0002] In the process of crude oil extraction, natural gas and water are also extracted at the same time. In order to determine the output of crude oil and natural gas, and to understand the changes in crude oil reserves in the formation, it is necessary to continuously measure the output of crude oil and natural gas. The production of water makes it difficult to measure a single crude oil, and the error increases. When more natural gas and water are produced, a single crude oil flowmeter cannot be used. Therefore, when measuring crude oil, the output of natural gas and water must be considered, that is, the flow measurement of gas-liquid three-phase must be carried out. [0003] There...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F5/00G01F1/44
CPCG01F1/44G01F5/005
Inventor 毛桦周芳德刘磊周思怡徐信强
Owner 陕西敬信义能源科技有限公司
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