Irregular Venturi flowmeter and method for measuring gas-liquid phase flow in multiphase flow by utilization of irregular Venturi flowmeter

A Venturi and flowmeter technology, applied in mass flow measurement devices, detecting fluid flow by measuring differential pressure, indirect mass flowmeters, etc., can solve problems such as poor universality of expressions, and improve universality and measurement Accuracy, flow algorithm unique and simple effect

Inactive Publication Date: 2016-06-15
CHINA NAT OFFSHORE OIL CORP +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the fluid properties and working conditions of different gas wells are different, the expression obtained by using the laboratory data fitting method has poor universality. (no reference standard) almost impossible to achieve
Therefore, there are big problems in the universality of these two methods.

Method used

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  • Irregular Venturi flowmeter and method for measuring gas-liquid phase flow in multiphase flow by utilization of irregular Venturi flowmeter
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  • Irregular Venturi flowmeter and method for measuring gas-liquid phase flow in multiphase flow by utilization of irregular Venturi flowmeter

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Embodiment Construction

[0023] Such as figure 1 As shown, a special-shaped Venturi flowmeter of the present invention includes a Venturi tube and a pressure monitor, wherein the Venturi tube is composed of a front straight pipe section 1, a contraction section 2, a throat section 3, an expansion section 4 and a rear section connected in sequence. The inner diameter of the front straight pipe section 1 and the rear straight pipe section 5 is D, the inner diameter of the throat section 3 is d, the contraction section 2 and the expansion end 4 are both tapered, and the structural parameter of the Venturi tube β=d / D=0.45-0.75, the length of throat section 3 is 2d-8d, the taper of contraction section 2 is 10.5°, and the taper of expansion section 4 is 7.5°.

[0024] Further, the above-mentioned pressure monitors are at least 3 pressure probes or 2 pressure difference sensors. This example figure 1 Shown is a solution where the pressure monitor is three pressure probes, the three pressure probes are the...

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Abstract

The invention discloses an irregular Venturi flowmeter, comprising a Venturi tube and at least three pressure probes, wherein the Venturi tube is composed of a front straight tube section, a contraction section, a throat section, an expansion section and a rear straight tube section; all the sections are connected in sequence; the inner diameter of each of the front straight tube section and the rear straight tube section is D; the inner diameter of the throat section is d; each of the contraction section and the expansion section is conical; the structural parameters of the Venturi tube are as follows: beta=d/D=0.45 to 0.75, the length of the throat section is 2d to 8d, the conical degree of the contraction section is 10.5 degrees, and the conical degree of the expansion section is 7.5 degrees. The invention further relates to a method for measuring gas phase flow and liquid phase flow in moisture by utilization of the irregular Venturi flowmeter. The irregular Venturi flowmeter is especially suitable for measuring downhole moisture flow, and is especially used for monitoring the gas phase flow and the liquid phase flow in an underground connected well connecting a main gas reservoir with a related gas reservoir in the process of manual migration and development of related oil-gas reservoirs in real time.

Description

technical field [0001] The invention relates to the field of wet gas metering equipment and metering methods, in particular to a special-shaped Venturi flowmeter and a method for measuring gas-liquid phase flow in multiphase flow with it. Background technique [0002] Some basic concepts involved in the field of multiphase flow measurement are as follows: "Total mass flow rate" refers to the sum of the mass of the gas phase and liquid phase in the flow measurement section of the pipeline section per unit time. "Gas mass flow rate" refers to the mass of the gas phase flowing through the pipe section of the measurement section per unit time. "Liquid mass flow rate" refers to the mass of the liquid phase flowing through the pipe section of the measurement section per unit time. "Slip ratio" refers to the ratio of the velocity of the fluid in the gas phase to the velocity of the fluid in the liquid phase, denoted by S. "Pre-differential pressure" refers to the pressure differe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F1/44G01F1/88
CPCG01F1/44G01F1/88
Inventor 郑永建潘艳芝马勇新曾桃赵军林
Owner CHINA NAT OFFSHORE OIL CORP
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