CN105865558A - Flow measuring device for multiphase flow of natural gas hydrate and measuring method of flow measuring device - Google Patents

Abstract

The invention relates to a measuring device and a measuring method thereof in the field of natural gas, particularly to a flow measuring device for multiphase flow of a natural gas hydrate. The flow measuring device comprises a differential pressure transmitter, a first pressure drawing pipe and a second pressure drawing pipe, wherein the first pressure drawing pipe and the second pressure drawing pipe are perpendicular to each other and fixed at an elbow; one end of the differential pressure transmitter is connected with the first pressure drawing pipe, and the other end of the differential pressure transmitter is connected with the second pressure drawing pipe; the first pressure drawing pipe is perpendicular to an incoming direction of a fluid in a straight pipe, and the second pressure drawing pipe is parallel to the incoming direction of the fluid in the straight pipe; the volume flow of pipe delivered media is calculated according to a formula shown in the specification. The measuring device and the measuring method thereof are used for determining flow of gas-phase media, liquid-phase media and three-phase mixed media in a solid-state fluidization mining experiment system for a marine natural gas hydrate and provides the basis for research of flow and heat transfer characteristics of the natural gas hydrate and storage and transportation of the marine natural gas hydrate.

Description

Gas hydrates multiphase flow rate measurement apparatus and measuring method thereof

Technical field

The present invention relates to a kind of natural gas field measurement apparatus and measuring method, specially gas hydrates are many Stream flow measurement device and measuring method thereof mutually.

Background technology

Gas hydrates, are by small molecule hydrocarbon class (mainly CH₄) with hydrone at low temperature and condition of high voltage A kind of cage modle crystalline solid that lower dependence Van der Waals force is formed.In theory, 1m³Gas hydrates releasable 164m³Standard state CH₄And 0.8m³Water.The methane content contained in the gas hydrates of the whole world is about 1.8-2.1x10¹⁶m³, be equivalent to the twice of carbon equivalent in the fuel such as coal that the whole world has been found that, oil, natural gas Many.Gas hydrates, as the new forms of energy of a kind of efficient green, are described as " rare-view set-up " and are hopeful most Strategic resource, by highest attention both domestic and external.

At present, the research of gas hydrates is the most at the experimental stage, and for heterogeneous Jie of gas hydrates Flow-measuring method and the device of matter are less, and there is the problem that measurement apparatus is complicated, degree of accuracy is the highest.

Summary of the invention

For above-mentioned technical problem, the present invention provides a kind of flow for gas hydrates multiphase medium to survey Metering method and measurement apparatus, the empirical flow being mainly used in exploitation of gas hydrates experimental system measurement,

Gas hydrates multiphase flow rate measurement apparatus, draws including differential pressure transmitter, the first pressure guiding pipe and second Pressure pipe, the first pressure guiding pipe and the second pressure guiding pipe are mutually perpendicular to, and are fixed on pipe bent position；Differential pressure transmitter one end is even First pressure guiding pipe, the other end connects the second pressure guiding pipe.

The measuring method of gas hydrates multiphase flow rate measurement apparatus:

A bit on the cross section of cut-off pipe current stabilization, is designated as an A, the first pressure guiding pipe and second is drawn at A point Pressure pipe is mutually perpendicular to fix, and the first pressure guiding pipe is perpendicular to straight tube fluid and carrys out flow path direction, and the second pressure guiding pipe is parallel to Straight tube fluid carrys out flow path direction；

Manage the volume flow of defeated medium:

$Q=\frac{{\mathrm{\πD}}^2}{4}\·\sqrt{\frac{2\mathrm{\Δ}P}{\mathrm{\ρ}}}$

D is straight tube internal diameter of the pipeline, and Δ P is pressure differential deltap P=P of two pressure guiding pipes₂-P₁, P₁It it is the first pressure guiding pipe Measured pressure, P₂It is the pressure measured by the second pressure guiding pipe；

ρ is the density of fluid, and when managing defeated medium and being monophasic fluid, ρ is its density under operating mode, works as pipe When defeated medium is heterogeneous fluid, ρ is relative density, experiment measure.

In ocean gas hydrate solid state fluidizing Mining Test system, the defeated loop of whole pipe is in constant temperature and pressure Under conditions of, and the velocity of medium of maximum is 5m/s, estimates the scope of pressure difference, thus selects to meet range The differential pressure transmitter required.

The gas hydrates multiphase flow rate measurement apparatus of present invention offer and measuring method thereof, use Yu Haiyang sky The so gas phase in gas hydrate solid state fluidizing extracting experiment system, liquid phase, flow measurement of three-phase blending agent, By measure manage defeated multiphase medium these basic underlying variables of flow, for gas hydrates flowing and heat-transfer character with And the accumulating research of ocean gas hydrate provides foundation, thus accelerate the process of industrialization of gas hydrates.

Figure of description

Fig. 1 is the structural representation of the present invention.

Fig. 2 is the ocean gas hydrate solid state fluidizing extracting experiment system diagram of embodiment.

Detailed description of the invention

It is described in conjunction with the embodiments the detailed description of the invention of the present invention.The present embodiment is all based on ocean natural gas hydration The flow measurement of the different closed circuit media in thing solid state fluidizing extracting experiment system.

Embodiment 1

As it is shown in figure 1, gas hydrates multiphase flow rate measurement apparatus, including differential pressure transmitter, first draw Pressure pipe 4 and the second pressure guiding pipe 3, the first pressure guiding pipe 4 and the second pressure guiding pipe 3 are mutually perpendicular to, and are fixed on bend pipe At 2；Differential pressure transmitter one end connects the first pressure guiding pipe 4, and the other end connects the second pressure guiding pipe 3.

The measuring method of gas hydrates multiphase flow rate measurement apparatus:

On the cross section of cut-off pipe 1 current stabilization a bit, be designated as an A, at A point by the first pressure guiding pipe 4 and the Two pressure guiding pipes 3 are mutually perpendicular to fix: in the first pressure guiding pipe 4 is perpendicular to straight tube 1, fluid carrys out flow path direction, and second draws In pressure pipe 3 is parallel to straight tube 1, fluid carrys out flow path direction；

Manage the volume flow of defeated medium:

$Q=\frac{{\mathrm{\πD}}^2}{4}\·\sqrt{\frac{2\mathrm{\Δ}P}{\mathrm{\ρ}}}$

D is straight tube 1 internal diameter of the pipeline, and Δ P is pressure differential deltap P=P of two pressure guiding pipes₂-P₁, P₁It it is the first impulse Pressure measured by pipe 4, P₂It is the pressure measured by the second pressure guiding pipe 3；

ρ is the density of fluid, and when managing defeated medium and being monophasic fluid, ρ is its density under operating mode, works as pipe When defeated medium is heterogeneous fluid, ρ is relative density, experiment measure.

Concrete, as in figure 2 it is shown, based on the gas in ocean gas hydrate solid state fluidizing extracting experiment system Closed circuit, relevant parameter:

Working media: methane gas；

Pipeline work pressure: 10MPa；

Pipeline:

Pressure guiding pipe size:

Pressure guiding pipe material: 06Cr9Ni10；

Differential pressure transmitter: Honeywell ST3000

Differential pressure transmitter range: 0～100kPa；

Elbow (2) place of gas hydrates multiphase flow rate measurement apparatus straight tube (1) in gas closed circuit After installing, its measurement procedure is as follows:

(1) before circuit system is opened, first by the differential pressure transmitter at 3 flow measurement points in gas closed circuit PDT101, PDT102, PDT103 reset；

(2), after circuit system is opened, when methane gas reaches stable conveying, 3 flow measurement points are read The pressure difference of the differential pressure transmitter at place, is designated as Δ P respectively₁、ΔP₂、ΔP₃；

(3) calculated flow rate:

According to formula:

$Q=\frac{{\mathrm{\πD}}^2}{4}\·\sqrt{\frac{2\mathrm{\Δ}P}{\mathrm{\ρ}}}$

By Δ P₁、ΔP₂、ΔP₃Substituting into, the flow that just can calculate 3 measurement point is respectively Q₁、Q₂、Q₃。

Wherein ρ is the density of methane.

Embodiment 2

Based on the liquid closed circuit in ocean gas hydrate solid state fluidizing extracting experiment system, its relevant parameter As follows:

Working media: water；

Pipeline work pressure: 10MPa；

Pipeline:

Pressure guiding pipe size:

Pressure guiding pipe material: 06Cr9Ni10；

Differential pressure transmitter: Honeywell ST3000

Differential pressure transmitter range: 0～100kPa；

After elbow (2) place of flow measurement device straight tube (1) in liquid closed circuit installs, it is surveyed Amount flow process is as follows:

(1), before circuit system is opened, first the differential pressure transmitter at PDT201, PDT202 is reset；

(2) after circuit system is opened, when the liquid during water circulates reaches stable conveying, data, note are read For Δ P₁、ΔP₂；；

(3) calculated flow rate；

$Q=\frac{{\mathrm{\πD}}^2}{4}\·\sqrt{\frac{2\mathrm{\Δ}P}{\mathrm{\ρ}}}$

Wherein ρ is the density of water.The volume flow Q of flow measurement points can be obtained respectively₁、Q₂。

Embodiment 3

This example circulates based on the three-phase blending agent in ocean gas hydrate solid state fluidizing extracting experiment system Loop, its relevant parameter is as follows:

Working media: gas hydrates

Pipeline work pressure: 10MPa；

Pipeline: DN80；

Pressure guiding pipe size:

Pressure guiding pipe material: 06Cr9Ni10；

Differential pressure transmitter: Honeywell ST3000

Differential pressure transmitter range: 0～100kPa；

Treat that elbow (2) place of flow measurement device straight tube (1) in three-phase blending agent closed circuit installs Bi Hou, its measurement procedure is as follows:

(1) before circuit system is opened, first by the differential pressure at PDT501, PDT601, PDT602, PDT603 Transmitter resets；

(2), after circuit system is opened, when gas hydrates reach stable conveying, data are read respectively, It is designated as Δ P₁、ΔP₂、ΔP₃、ΔP₄；

(3) calculated flow rate；

The pressure difference Δ P that differential pressure transmitter is read₁、ΔP₂、ΔP₃、ΔP₄Bring derivation formula into:

$Q=\frac{{\mathrm{\πD}}^2}{4}\·\sqrt{\frac{2\mathrm{\Δ}P}{\mathrm{\ρ}}}$

Wherein ρ is the relative density of gas hydrates, by measuring.Can calculate at place's flow-speed measurement point Flow be Q respectively₁、Q₂、Q₃、Q₄。

Claims (2)

1. gas hydrates multiphase flow rate measurement apparatus, it is characterised in that include differential pressure transmitter, first Pressure guiding pipe and the second pressure guiding pipe, the first pressure guiding pipe and the second pressure guiding pipe are mutually perpendicular to, and are fixed on pipe bent position；Difference Pressure transmitter one end connects the first pressure guiding pipe, and the other end connects the second pressure guiding pipe.

The measuring method of gas hydrates multiphase flow rate measurement apparatus the most according to claim 1, its It is characterised by, including procedure below:

A bit on the cross section of cut-off pipe current stabilization, is designated as an A, the first pressure guiding pipe and second is drawn at A point Pressure pipe is mutually perpendicular to fix, and the first pressure guiding pipe is perpendicular to straight tube fluid and carrys out flow path direction, and the second pressure guiding pipe is parallel to Straight tube fluid carrys out flow path direction；

Manage the volume flow of defeated medium:

$Q=\frac{{\mathrm{\πD}}^2}{4}\·\sqrt{\frac{2\mathrm{\Δ}P}{\mathrm{\ρ}}}$

D is straight tube (1) internal diameter of the pipeline, and Δ P is pressure differential deltap P=P of two pressure guiding pipes₂-P₁, P₁It is first Pressure measured by pressure guiding pipe, P₂It is the pressure measured by the second pressure guiding pipe；

ρ is the density of fluid, and when managing defeated medium and being monophasic fluid, ρ is its density under operating mode, works as pipe When defeated medium is heterogeneous fluid, ρ is relative density, experiment measure.