CN202486130U - Water content measuring device for crude oil of wellhead - Google Patents

Abstract

The utility model discloses a water content measuring device for crude oil of a wellhead. The water content measuring device comprises a gauging tank and a filtering tank which are connected with each other. An electromagnetic valve is mounted between the gauging tank and the filtering tank, a water level transmitter, a pressure transmitter and a temperature sensor are mounted in the gauging tank, signals detected by the water level transmitter, the pressure transmitter and the temperature sensor are transmitted to a central processing unit, and the central processing unit calculates and displays the water content of the crude oil of the wellhead. The water content measuring device for the crude oil of the wellhead not only can dynamically measure the water content of export crude oil in real time, but also can statically measure the water content of the export crude oil, so that the water content of the crude oil in a high-water-content oil well discontinuously producing oil can be dynamically measured in real time.

Description

A kind of well head crude oil water containing measurement mechanism

Technical field

The utility model belongs to crude oil water containing measurement mechanism technical field, relates to a kind of well head crude oil water containing measurement mechanism.

Background technology

Oil well production crude oil water containing real time dynamic measurement mainly is divided into dual mode, i.e. manual measurement and on-line measurement.The manual measurement method is the way of distillation, and the data that this measuring method adopts the wellhead sampling laboratory to draw can't be explained oil well crude oil water containing time of day in real time.The method of on-line measurement crude oil water content has a lot, on application principle, mainly contains capacitance method, gamma-rays method, shortwave absorption process, microwave method, frequency electromagnetic waves method, densimetry etc.This measuring method is suitable for low moisture, the continuous fuel-displaced oil well of oil well more, is not suitable for high moisture, discontinuous fuel-displaced oil well.Therefore, exist the problem that crude oil water containing can't real time dynamic measurement of producing for oil well.

The utility model content

The technical matters that the utility model solves is to provide a kind of well head crude oil water containing measurement mechanism, obtains the measurement crude oil water containing device of oil well production crude oil water containing dynamic real-time with static metering system.Make the crude oil water containing kinetic measurement in real time of high moisture, discontinuous fuel-displaced oil well.

The utility model is to realize through following technical scheme:

A kind of well head crude oil water containing measurement mechanism comprises interconnective test tank and hay tank, between test tank and the hay tank solenoid valve is installed, and fluid level transmitter, pressure unit and temperature sensor are installed in the test tank; Fluid level transmitter, pressure unit and temperature sensor are transferred to central computation unit with the signal of its detection, and central computation unit is calculated the well head water content in crude oil and shown.

On the described fluid level transmitter ball float is installed.

Described hay tank is connected with feed line, and test tank is connected with external transport pipeline.

Be provided with solenoid valve between described test tank and the external transport pipeline.

Compared with prior art, the utlity model has following beneficial technical effects:

The well head crude oil water containing measurement mechanism that the utility model provides, measurement in real time dynamically, the outer output oil water percentage of measurement that again can be static make the crude oil water containing kinetic measurement in real time of high moisture, discontinuous fuel-displaced oil well.Further, CPU also shows to remote display through the data transmission of connecting line with water content in crude oil, realizes the data remote function, for the production dynamic management provides reliable basis.

The well head crude oil water containing measurement mechanism that the utility model provides, simple in structure, convenient, good, the accurate measurement of continuous performance of installation maintenance.Actual detected result shows the degree of accuracy of the crude oil water content that this device is measured less than ± 5%, reaches the requirement of three grades of measurement standard of the regulation of petroleum industry standard SY/T 0004-98 " the oilfield collection is failed design specifications ".

Description of drawings

Accompanying drawing 1 is the structural drawing of the utility model;

Accompanying drawing 2 connects synoptic diagram for the utility model CPU.

Wherein: 1-fluid level transmitter, 2-pressure unit, 3-temperature sensor, 4-ball float, 5-test tank, 6-hay tank, 7-solenoid valve, 8-solenoid valve.

Embodiment

Below in conjunction with accompanying drawing the utility model is done to describe in further detail, said is explanation rather than qualification to the utility model.

Referring to Fig. 1, Fig. 2, a kind of well head crude oil water containing measurement mechanism comprises interconnective test tank 5 and hay tank 6, between test tank 5 and the hay tank 6 solenoid valve 7 is installed, and fluid level transmitter 1, pressure unit 2 and temperature sensor 3 are installed in the test tank 5;

Fluid level transmitter 1, pressure unit 2 and temperature sensor 3 are transferred to CPU with the signal of its detection, and CPU is calculated the well head water content in crude oil and shown.

Concrete feed line is connected with hay tank 6; Solenoid valve 7 is installed between hay tank 6 and the test tank 5; Solenoid valve 8 is installed on the flow line after the test tanks 5, a range is installed is 5kPa, accuracy class in the bottom of test tank 5 and be 1 ‰ pressure unit 2, range and be 500mm, accuracy class and be 1 ‰ fluid level transmitter 1 and one and can be accurate to 1 ℃ of temperature sensor 3.

Ball float 4 is installed on the fluid level transmitter 1, so as with observe liquid level intuitively so that the detection of water cut.

Concrete testing process is following:

1) enter into from oil well in the hay tank 6 when crude oil (oil water mixture), after accomplishing tasks such as impurity screening, degasification, get in the test tank 5 through pipeline, solenoid valve 7 is openings on this moment pipeline, and solenoid valve 8 is closure states;

Test tank is after 5 oil-feed a period of times, solenoid valve 7 closures, and pressure unit 2 is measured the pressure value P in the test tank 5 under the current state respectively with fluid level transmitter 1 ₁, level value H ₁, solenoid valve 7 unlatching once more then, after continuation oil-feed a period of time, solenoid valve 7 cuts out, and pressure unit 2 is measured the pressure value P of this moment respectively with fluid level transmitter 1 ₂With level value H ₂, and then measure the temperature T of the crude oil in the test tank under the present situation 5 by temperature sensor 3;

After above-mentioned detection signal sends CPU to, draw twice measurement difference DELTA P, Δ H; Inquire the density value ρ of the crude oil in the oil water mixture under this temperature value _o,, can draw corresponding crude oil water content D through computing formula (1)～(7) _MShow then, perhaps show to remote display through the data transmission of mistake connecting line with water content in crude oil;

After above-mentioned detection was accomplished, solenoid valve 8 was open-minded, and the oil of putting in the test tank 5 gets into external transport pipeline, and after the liquid level of oil reduced in the test tank 5, solenoid valve 8 cut out, and solenoid valve 7 is opened, and begin another measuring period.

2) being calculated as of described CPU:

Twice measured pressure difference value of test tank internal pressure transmitter is Δ P=P ₂-P ₁, twice measured liquid level difference of fluid level transmitter is Δ H=H ₂-H ₁The hybrid density of oil-water mixture is ρ; Local acceleration of gravity is g, so just have:

ΔP＝ρ·g·ΔH (1)

That is:

$\mathrm{\ρ}=\frac{(P_2-P_1)}{g\·(H_2-H_1)}---\left(2\right)$

If: the volume of oil-water mixture is that V, quality are M in the test tank, and wherein the density of pure oil is ρ in the mixed liquor _o, the volume of water is V _w, density is ρ _w, quality is M _wSo have:

ρ·V＝ρ _w·V _w+ρ _o·V _o (3)

That is:

ρ·V＝ρ _w·V _w+ρ _o·(V-V _w) (4)

Then, can get thus oil-water mixture moisture volume ratio D _VFor:

$D_V=\frac{V_w}{V}=\frac{\mathrm{\ρ}-{\mathrm{\ρ}}_o}{{\mathrm{\ρ}}_w-{\mathrm{\ρ}}_o}---\left(5\right)$

In like manner, in the oil-water mixture moisture mass ratio D _MFor:

$D_M=\frac{M_w}{M}=\frac{{\mathrm{\ρ}}_w\·V_w}{\mathrm{\ρ}\·V}=\frac{{\mathrm{\ρ}}_w}{\mathrm{\ρ}}\·\frac{\mathrm{\ρ}-{\mathrm{\ρ}}_o}{{\mathrm{\ρ}}_w-{\mathrm{\ρ}}_o}=\frac{{\mathrm{\ρ}}_w}{{\mathrm{\ρ}}_w-{\mathrm{\ρ}}_o}(1-\frac{{\mathrm{\ρ}}_o}{\mathrm{\ρ}})---\left(6\right)$

In formula (1) substitution (6), that is:

$D_M=\frac{{\mathrm{\ρ}}_w}{{\mathrm{\ρ}}_w-{\mathrm{\ρ}}_o}(1-\frac{{\mathrm{\ρ}}_o\mathrm{g\ΔH}}{\mathrm{\ΔP}})---\left(7\right).$

Claims (5)

1. a well head crude oil water containing measurement mechanism is characterized in that, comprises interconnective test tank and hay tank, between test tank and the hay tank solenoid valve is installed, and fluid level transmitter, pressure unit and temperature sensor are installed in the test tank; Fluid level transmitter, pressure unit and temperature sensor are transferred to CPU with the signal of its detection, and CPU is calculated the well head water content in crude oil and shown.

2. a kind of well head crude oil water containing measurement mechanism as claimed in claim 1 is characterized in that, on the described fluid level transmitter ball float is installed.

3. a kind of well head crude oil water containing measurement mechanism as claimed in claim 1 is characterized in that described hay tank is connected with feed line, and test tank is connected with external transport pipeline.

4. a kind of well head crude oil water containing measurement mechanism as claimed in claim 3 is characterized in that, is provided with solenoid valve between described test tank and the external transport pipeline.

5. a kind of well head crude oil water containing measurement mechanism as claimed in claim 1 is characterized in that described CPU also shows to remote display through the data transmission of connecting line with water content in crude oil.

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