CN1129005C - Measuring method of crude petroleum water content and flow and equipment thereof - Google Patents

Abstract

The present invention relates to a method and a device capable of continuously measuring the precision, the water content and the flow quantity of crude oil in an on-line mode. The device comprises two heat conduction elements and a temperature sensor obliquely arranged in a pipeline, wherein a heater and the temperature sensor are respectively installed in the heat conduction elements. The heat diffusivity of the two heat conduction elements in liquid is measured to obtain two groups of relational relationships between the heat diffusivity and the flow quantity and between the heat diffusivity and the water content; then, the water content of crude oil and the flow quantity of oily water are calculated. The present invention is suitable for measuring the flow quantity and the phase ratio of all liquid-liquid two-phase fluid with differential thermophysical properties.

Description

Measure the devices and methods therefor of crude oil water content

One, affiliated technical field

The present invention relates to a kind of the realization and reach online measurement mechanism continuously, further relate to the measurement mechanism and the method thereof of crude oil water content in a kind of crude oil and the water mixed flow crude oil water content.

Two, background technology

At present, contain water in most crude oil pipelines, water percentage does not wait from a few percent to percent tens, measures crude oil water content, flow and be in crude production, the course of conveying one basic demand.Crude oil water containing is that with the difficulty of flow measurement the emulsion of crude oil and water formation is different with the variation of water percentage.The measurement of water percentage is also relevant with flow measurement, therefore, up to the present, there are not a kind of crude oil water containing measuring method and device can reach the level of accurate measurement a few percent to one of percentage hundred, energy measurement viscous crude water percentage more not approaches the density (930kg/m of water when oil density ³) time, the measuring method of applied dynamics principle can cause very large deviation.

Three, summary of the invention

The objective of the invention is to overcome the shortcoming of above-mentioned prior art, propose a kind of heat-conducting method and measured the devices and methods therefor of crude oil water content, the water percentage of crude oil be can measure simultaneously, all thermophysical propertys discrepant (heat conduction, specific heat, viscosity etc.) flow of liquid-gas-liquid two-phase liquid, the measurement of phase ratio are applicable to.

The device of measurement crude oil water content of the present invention, comprise: a temperature sensor of installing in a pipeline that is connected with the oil pipeline of oil well and the pipeline, be characterized in, also include two heat conducting elements in the pipeline, well heater and temperature sensor are housed respectively in the heat conducting element, the broadside of a heat conducting element is parallel to pipe centerline, the broadside of another heat conducting element is perpendicular to pipe centerline, the temperature sensor of installing in the pipeline is vertical or tilt to place pipeline, and each sensor and heat conducting element well heater are connected with operating mode epiphase outside the pipeline respectively.

Other characteristics of the present invention are that described two heat conducting elements can exchange in the installation site of pipeline.

Realize the method for the device of above-mentioned measurement crude oil water content, carry out in the following manner:

1) thermal diffusivity of two of measuring channel inside heat conducting elements in liquid.Obtain two groups of thermal diffusivities, water percentage relational expression:

1. thermal diffusivity is: $\frac{q_1}{(T_1-T_0)K_m\·l}=C_1+C_2{R}_e^m{P}_r^{0.33}---\left(1\right)$ $\frac{q_2}{(T_2-T_0)K_m\·l}=b_1+b_2{R}_e^n{P}_r^{0.33}---\left(2\right)$

In the formula:

M, n are constant, by the experiment decision;

u _mFor the potpourri speed of crude oil and water, from R _eTry to achieve in the number;

q ₁, q ₂Be heating power;

T ₁, T ₂, T ₀Temperature and fluid temperature (F.T.) for heat conducting element;

K _mBe the potpourri coefficient of heat conductivity;

R _eBe Reynolds number; $R_e=\frac{u_{m}d{\mathrm{\ρ}}_m}{{\mathrm{\μ}}_m}$

μ _mBe mixture viscosity;

L is a heat conducting element length; D is an equivalent diameter; ρ _mBe density; $p_r=\frac{C_p\·\mathrm{\μ}}{K}$

C _PmBe specific heat at constant pressure

C ₁, C ₂, b ₁, b ₂Be constant

2) and then simultaneous fluid thermal dispersion relation formula, thus obtain crude oil water content.

2. water percentage h satisfies following relational expression:

The fluid physics parameter can be expressed as,

C _pm＝hC _pw+(1-h)C _po

K _m＝hK _w+(1-h)K _o

μ _m＝hμ _w+(1-h)μ _o

H is a water percentage in the formula

Can try to achieve crude oil water content h by last two formulas;

Wherein, heating power records by heater voltage and electric current; Temperature difference is by the internal temperature sensor of heat conducting element and be loaded on the temperature gained of measuring between the temperature sensor in the fluid separately;

Well heater is provided with the different heating power controller, according in two heat conducting elements between heating-up temperature and the fluid temperature difference size change, to guarantee between two heat conducting elements and a fluid fixed difference difference being arranged.

The present invention can be applicable to crude oil water content, or the discrepant liquid of other any physical property-liquid two-phase amount, phase ratio measure, and is not subjected to the restriction of temperature, pressure, conveyance conduit size, and on-line continuous is measured.

Four, description of drawings

Accompanying drawing is the one-piece construction synoptic diagram of apparatus of the present invention.

Five, embodiment

The invention will be further described below in conjunction with accompanying drawing.

The device of measurement crude oil water content of the present invention, comprise: the temperature sensor of installing in a pipeline 1 that is connected with the oil pipeline of oil well and the pipeline 13, also include heat conducting element 4 and heat conducting element 5 in the pipeline 1, well heater 6 and temperature sensor 7 are housed respectively in the heat conducting element 4, well heater 8 and temperature sensor 9 are housed respectively in the heat conducting element 5, the broadside of heat conducting element 4 is parallel to pipe centerline, the broadside of heat conducting element 5 is perpendicular to pipe centerline, temperature sensor 3 is vertical or tilt to place pipeline 1, sensor 3, sensor 7, sensor 9, heat conducting element 4, heat conducting element 5, well heater 6 is connected with pipeline 1 operating mode table 10 outward respectively with well heater 8.

In addition, 1 is fluid line among the figure, the 2nd, and fluid.

Measuring method of the present invention obtains two groups of thermal diffusivity water percentage relational expressions for measuring the inner thermal diffusivity of two heat conducting elements in liquid that well heater and temperature sensor are housed.

Two heat conducting element installation sites in fluid are inequality, and the broadside of a heat conducting element is parallel to pipe centerline; The broadside of another heat conducting element is perpendicular to pipe centerline;

The heat transfer equation of two groups of well heaters is: $\frac{q_1}{L\&CenterDot;\mathrm{\&Delta;}{t}_1\&CenterDot;K_m}=C_1+C_2{R}_e^m{P}_r^{0.33}$ $\frac{q_2}{L\&CenterDot;\mathrm{\&Delta;}{\mathrm{<figure-callout\; id="2"\; label="t"\; filenames="C9911596000091.png"\; state="\{\{state\}\}">t</figure-callout>}}_2\&CenterDot;K_m}=b_1+b_2{R}_e^n{P}_r^{0.33}$

Heating power records by heater voltage and electric current;

Temperature difference is by internal temperature sensor 7,9 and be loaded on separately between the temperature sensor 3 in the fluid and measure gained;

And then simultaneous fluid thermal dispersion relation formula, thereby obtain crude oil water content.

Well heater constant current power supply, equipment different heating power controller.Change according to temperature difference size between heating rectangular parallelepiped and the liquid.Heating power, temperature sensor links to each other with secondary instrument, carries out data acquisition process and output.

Measuring principle:

The thermal diffusivity of heating rectangular parallelepiped in oil water mixture or other liquid-liquid mixture is: $\frac{q_1}{(T_1-T_0)K_m\&CenterDot;I}=C_1+C_2{R}_e^m{P}_r^{0.33}---\left(1\right)$ $\frac{q_2}{(T_2-T_0)K_m\&CenterDot;l}=b_1+b_2{R}_e^n{P}_r^{0.33}---\left(2\right)$

In the formula:

M, n are constant, by the experiment decision;

u _mFor the potpourri speed of crude oil and water, from R _eTry to achieve in the number;

q ₁, q ₂Be heating power;

T ₁, T ₂, T ₀Temperature and fluid temperature (F.T.) for heat conducting element;

K _mBe the potpourri coefficient of heat conductivity;

R _eBe Reynolds number; $R_e=\frac{u_{m}d{\mathrm{\&rho;}}_m}{{\mathrm{\&mu;}}_m}$

μ _mBe mixture viscosity;

L is a heat conducting element length; D is an equivalent diameter; ρ _mBe density;

P _rBe Prandtl number $p_r=\frac{C_{\mathrm{pm}}\&CenterDot;{\stackrel{.}{\mathrm{\&mu;}}}_m}{K_m}$

C _PmBe the potpourri specific heat at constant pressure

C ₁, C ₂, b ₁, b ₂Be constant

Water percentage h satisfies following relational expression:

The fluid physics parameter can be expressed as,

C _pm＝hC _pw+(1-h)C _po

K _m＝hK _w+(1-h)K _o

μ _m＝hμ _w+(1-h)μ _o

H is a water percentage in the formula

C _PwBe the water specific heat at constant pressure

C _PoBe oily specific heat at constant pressure

K _wThe water coefficient of heat conductivity

K _oBe oily coefficient of heat conductivity

Get final product by last two formulas

Two formulas can obtain in the substitution $\frac{q_1}{T_1-T_0}=f(u_m,h)$ $\frac{q_1}{T_2-T_0}=f^{\&prime;}(u_m,h)$

Can try to achieve crude oil water content h by last two formulas.

The present invention can be applicable to crude oil water content, or the discrepant liquid of other any physical property-liquid two-phase amount, phase ratio measure, and is not subjected to the restriction of temperature, pressure, conveyance conduit size, and on-line continuous is measured.

Claims (3)

1, a kind of device of measuring crude oil water content, comprise: the temperature sensor of installing in a pipeline [1] that is connected with the oil pipeline of oil well and the pipeline [1] [3], it is characterized in that, also include heat conducting element [4] and heat conducting element [5] in the pipeline [1], well heater [6] and temperature sensor [7] are housed respectively in the heat conducting element [4], well heater [8] and temperature sensor [9] are housed respectively in the heat conducting element [5], the broadside of heat conducting element [4] is parallel to pipe centerline, the broadside of heat conducting element [5] is perpendicular to pipe centerline, temperature sensor [3] is vertical or tilt to place pipeline [1], sensor [3], sensor [7], sensor [9], heat conducting element [4], heat conducting element [5], well heater [6] is connected with pipeline [1] operating mode table [10] outward respectively with well heater [8].

2, the device of measurement crude oil water content according to claim 1 is characterized in that, described heat conducting element [4] and heat conducting element [5] can exchange in the installation site of pipeline [1].

3, the method for the device of the measurement crude oil water content of realization claim 1 is characterized in that, carries out in the following manner:

1) the inner thermal diffusivity of two heat conducting elements in liquid of measuring channel [1] obtains two groups of thermal diffusivities and flow water percentage relational expression:

Thermal diffusivity is: $\frac{q_1}{(T_1-T_0)K_m\&CenterDot;l}=C_1+C_2{R}_e^m{P}_r^{0.33}---\left(1\right)$ $\frac{q_2}{(T_2-T_0)K_m\&CenterDot;l}=b_1+b_2{R}_e^n{P}_r^{0.33}---\left(2\right)$

In the formula:

Exponent m, n is a constant, by the experiment decision

C ₁, C ₂, b ₁, b ₂Be constant

u _mFor the potpourri speed of crude oil and water, from R _eTry to achieve in the number;

q _e, q ₂Be heating power

T ₁, T ₂, T ₀Temperature and fluid temperature (F.T.) for heat conducting element

K _mBe the potpourri coefficient of heat conductivity

R _eBe Reynolds number $R_e=\frac{u_{m}d{\mathrm{\&rho;}}_m}{{\mathrm{\&mu;}}_m}$

μ _mBe mixture viscosity

L is a heat conducting element length, and d is an equivalent diameter, ρ _mBe density;

P _rBe Prandtl number $p_r=\frac{C_{\mathrm{pm}}\&CenterDot;{\mathrm{\&mu;}}_m}{K_m}$

C _PmBe the potpourri specific heat at constant pressure

2) and then simultaneous fluid thermal dispersion relation formula, thus obtain crude oil water content

Water percentage h satisfies following relational expression:

The fluid physics parameter can be expressed as,

C _pm＝hC _pm+(1-h)C _po

K _m＝hK _w+(1-h)K _o

μ _m＝hμ _w+(1-h)μ _o

H is a water percentage in the formula

C _PwBe the water specific heat at constant pressure

C _PoBe oily specific heat at constant pressure

K _wBe the water coefficient of heat conductivity

K _oBe oily coefficient of heat conductivity

Can try to achieve crude oil water content h by last two formulas;

Wherein, heating power records by heater voltage and electric current; Temperature difference is by internal temperature sensor [7], [9] of heat conducting element and be loaded on the temperature gained of measuring between the temperature sensor [3] in the fluid separately.

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