CN202531155U - Oil well output metering device - Google Patents

Abstract

The utility model relates to an oil well output measurement field, in particular to are oil well output metering devices. Which comprises the following steps: the system comprises an oil-gas separator, a glass tube liquid level meter, a differential pressure sensor, a differential pressure transmitter and a controller; the oil-gas separator is provided with an output inlet, the inside of the oil-gas separator is provided with a bottom water area and a crude oil area, the bottom of the oil-gas separator is provided with a crude oil outlet pipeline, and the top of the oil-gas separator is provided with a gas outlet pipeline; the glass tube liquid level meter is arranged below the product inlet, and two ends of the glass tube liquid level meter are respectively communicated with the upper part of the crude oil area and the bottom water area of the oil-gas separator; two ends of the differential pressure sensor are respectively arranged at two ends of the glass tube liquid level meter; the differential pressure transmitter is respectively connected with two ends of the differential pressure sensor; the controller is connected with the differential pressure transmitter. The utility model discloses beneficial effect lies in realizing the automatic measurement of oil well gas, liquid output, greatly reduced workman's intensity of labour, the effect of using in the oil well between is more obvious, has improved measurement efficiency when guaranteeing the measurement accuracy, and the scientific and effective oil well measurement production of having guided.

Description

A kind of production metering of oil wells device

Technical field

The utility model relates to the production metering of oil wells field, particularly be a kind of production metering of oil wells device.

Background technology

Production metering of oil wells is exactly gas, the output of fluid of dynamic monitoring oil well; Through the dynamic analysis of output in the metering process being learnt down-hole oil reservoir geological condition changes and production is unusual; For production decision provides the accurate data support, be an important process in the field production management.At present; Produce the methods that adopt oil well measurement eliminator glazing pipe content gauge gauging in the metering process at crude oil more; The glass-tube liquid level meter strapping is to use the most general oil well measurement method; It is according to law of connected vessels, converts daily output through height and rise time that glass-tube liquid level meter rises.

But the most of oil well in Liaohe Oil Field belongs to a producing well at present, and a going out property is strong; Adopt the glass tube oil gauge mode; At least not enough below existing: as 1,, often not go up liquid level for a long time, or accomplish metering in the short time because the metering selection of time is improper; If amount to into daily flow to this type of continuous data, just can cause very mistake.2, this method is owing to human metering, and labour intensity is big, and the metering timeliness is low, has artificial error in reading and end water density error, and the continuous data of short time is difficult to reflect the true production fluid situation of oil well.

The utility model content

The utility model embodiment provides a kind of oil well output self-measuring device; It is big and labour intensity is big to be used for solving prior art glass tube oil gauge mode error in dipping; The metering timeliness is low; Have artificial error in reading and end water density error, the continuous data of short time is difficult to reflect the true production fluid situation problem of oil well.

The utility model embodiment provides a kind of production metering of oil wells device, and said device comprises:

Gs-oil separator, glass-tube liquid level meter, differential pressure pick-up, differential pressure transmitter, controller;

Said gs-oil separator is provided with the output object import, and its inside is provided with pool, the end and crude oil district, and its bottom is provided with the crude exports pipeline, and its top is provided with the gas vent pipeline;

Said glass-tube liquid level meter is arranged at the below of output object import, and its two ends are communicated with the top, crude oil district and the pool, the end of said gs-oil separator respectively;

The two ends of said differential pressure pick-up are arranged at the two ends of said glass-tube liquid level meter respectively;

Said differential pressure transmitter is connected with the two ends of said differential pressure pick-up respectively;

Said controller is connected with said differential pressure transmitter.

Above-mentioned production metering of oil wells device; Wherein, The crude exports pipeline of said gs-oil separator is provided with first electrically operated valve, and the gas vent pipeline of said gs-oil separator is provided with second electrically operated valve, and said first electrically operated valve all is connected with said controller with said second electrically operated valve.

Above-mentioned production metering of oil wells device also comprises: the gas flowmeter of metering gas flow is arranged at said gas vent pipeline and is connected with said controller.

Above-mentioned production metering of oil wells device also comprises: can carry out the electro connecting pressure gauge that superpressure is reported to the police, it is connected with said gs-oil separator and said controller.

Whereby; The production metering of oil wells device of employing the utility model can be realized the automatic gauge of casinghead gas, output of fluid; Greatly reduce working strength of workers; Application results is more obvious in a producing well, has improved metering efficient when guaranteeing measuring accuracy, has scientific and effectively instructed oil well measurement production.

Description of drawings

Accompanying drawing described herein is used to provide the further understanding to the utility model, constitutes the application's a part, does not constitute the qualification to the utility model.In the accompanying drawings:

Fig. 1 is the structural representation of a kind of production metering of oil wells device of providing of the utility model embodiment;

Fig. 2 is the device sketch map of a kind of production metering of oil wells device of providing of the utility model embodiment.

The specific embodiment

For the purpose, technical scheme and the advantage that make the utility model is clearer, will combine accompanying drawing that the utility model embodiment is done to describe in detail further below.At this, illustrative examples of the utility model and explanation thereof are used to explain the utility model, but not as the qualification to the utility model.

Be illustrated in figure 1 as the structural representation of a kind of production metering of oil wells device that the utility model embodiment provides.Comprising: gs-oil separator 101, glass-tube liquid level meter 102, differential pressure pick-up 103, differential pressure transmitter 104, controller 105; Wherein, said gs-oil separator 101 is provided with the output object import, and its inside is provided with pool, the end and crude oil district, and its bottom is provided with the crude exports pipeline, and its top is provided with the gas vent pipeline;

Said glass-tube liquid level meter 102 is arranged at the below of output object import, and its two ends are communicated with the top, crude oil district and the pool, the end of said gs-oil separator 101 respectively;

The two ends of said differential pressure pick-up 103 are arranged at the two ends of said glass-tube liquid level meter 102 respectively, are used for obtaining the differential pressure value of said gs-oil separator 101 crude oil;

Said differential pressure transmitter 104 is connected with the two ends of said differential pressure pick-up 103 respectively, is used for the differential pressure value that obtains is converted to the differential pressure signal of electrical signal form and exports to said controller 105;

Said controller 105 is connected with said differential pressure transmitter 104, can calculate the oil well output of this section period according to two differential pressure signals of the acquisition in the blanking time t.

The production metering of oil wells device that the utility model embodiment provides can be realized the automatic gauge of casinghead gas, output of fluid; Greatly reduce working strength of workers; Application results is more obvious in a producing well; Improve metering efficient when guaranteeing measuring accuracy, scientific and effectively instructed oil well measurement production.

Fig. 2 is the device sketch map of a kind of production metering of oil wells device of providing of the utility model embodiment.

Wherein this production metering of oil wells device comprises: gs-oil separator 201, glass-tube liquid level meter 202, differential pressure pick-up 203, differential pressure transmitter 204, controller 205.

Said gs-oil separator 201 is provided with output object import 210; Its inside is provided with pool, the end 206 and crude oil district 207; Its bottom is provided with crude exports pipeline 211 and is used for discharging through gs-oil separator 201 isolated crude oil, and its top is provided with gas vent pipeline 212 and is used for discharging through gs-oil separator 201 isolated gases;

Wherein, glass-tube liquid level meter 202 is arranged at the below of output object import 210, and its two ends are communicated with the top and the pool, the end 206 in the crude oil district 207 of said gs-oil separator 201 respectively.

The two ends of differential pressure pick-up 203 are arranged at the two ends of said glass-tube liquid level meter 202 respectively; Concrete; The upper end 203a of differential pressure pick-up 203 is arranged on glass-tube liquid level meter 202 and the conduit that the top in crude oil district 207 in the gs-oil separator 201 links to each other; The lower end 203b of differential pressure pick-up 203 is arranged on the conduit that pool, the end 206 links to each other in glass-tube liquid level meter 202 and the gs-oil separator 201; Difference between the force value in pool 206 at the bottom of 207 tops, crude oil district and the below in the gs-oil separator that the upper end 203a of said differential pressure pick-up 203 and lower end 203b record respectively, two force value is the differential pressure value of crude oil in the gs-oil separator 201; The two ends of differential pressure transmitter 204 connect the upper end 203a and the lower end 203b of differential pressure pick-up 203 respectively, are used for the differential pressure value that pressure sensor 203 records is converted to the differential pressure signal of electrical signal form; Controller 205 is connected with said differential pressure transmitter 204, can calculate the oil well output of this section period according to two differential pressure signals that obtain in the t blanking time.Preferably; Be t the blanking time of pre-set measurement in controller 205; Differential pressure value with the crude oil that monitors is transferred to differential pressure transmitter 204 and obtains differential pressure signal T1 differential pressure pick-up 203 in 0 moment, and the differential pressure signal T1 that differential pressure transmitter 205 will generate is transferred to controller 205, and t is during the moment; Differential pressure pick-up 203 is transferred to the differential pressure value of the crude oil that monitors differential pressure transmitter 204 and obtains differential pressure signal T2; The differential pressure signal T2 that differential pressure transmitter 205 will generate is transferred to controller 205, and controller 205 can calculate the oil production of this section period according to two the differential pressure signal T1 and the T2 that are t blanking time.Preferably, the controller 205 of present embodiment is selected Siemens PLC C controller (Programmable Logic Controller, programmable logic controller) for use, also can select single-chip microcomputer or RTU equal controller for use, but not as the qualification to the utility model.

A kind of production metering of oil wells device of the utility model in its another preferred implementation, is provided with in the gs-oil separator 201 and separates umbrella 208 and hide oil baffle 209; During work; The output object of oil well output gets into gs-oil separator 201 through output object import 210, and after separating umbrella 208 and hiding the separation of oil baffle 209, crude oil flows into the bottom of gs-oil separator 201 downwards; Above the liquid level in pool, the end 207, compile, the gas that carries in the said output object flows out through gas vent pipeline 212.Wherein, separate umbrella 208 and hide oil baffle 209 and all belong to prior art, can according to the gas-liquid of produced liquid in oil well when the specification etc. of gs-oil separator change its parameter, but not as qualification to the utility model.The use that separates umbrella 208 and screening oil baffle 209 is in order better to make Oil-gas Separation.

A kind of production metering of oil wells device of the utility model; In its another preferred implementation; Preferably; The crude exports pipeline 211 of said gs-oil separator 201 is provided with first electrically operated valve 214, and the gas vent pipeline 212 of said gs-oil separator is provided with second electrically operated valve 215, and said first electrically operated valve 214 all is connected with said controller 205 with said second electrically operated valve 215.During work, the fluid pressure higher limit is set in controller 205, when the differential pressure value of differential pressure transmitter 204 transmission surpassed the higher limit of setting, controller 205 controls second electrically operated valve 215 was closed, and first electrically operated valve 214 is opened simultaneously, in order to discharge crude oil.The setting of upper pressure limit value is the actual conditions according to the scene, is decided by the pressure that lifting height produced of liquid level, and liquid level should be lower than the height that separates umbrella 208.

Pass through to increase by first electrically operated valve 214 and second electrically operated valve 215 in the foregoing description; And the input of first electrically operated valve 214 and second electrically operated valve 215 is connected with the output of controller 206; Realize the purpose of crude oil in the automatic discharging gs-oil separator 201, further practiced thrift manpower.

A kind of production metering of oil wells device of the utility model; In its another preferred implementation, gas flowmeter 213 is set on gas vent pipeline 212, is used to measure the output of gas; Gas flowmeter 213 connects controller 205, sends the signal that obtains to controller 205.Controller 205 is connected with processor 216, thereby has realized the on-line monitoring of production fluid amount.

A kind of production metering of oil wells device of the utility model; In its another preferred implementation; This equipment also comprises: electro connecting pressure gauge 217; Be connected with said gs-oil separator 201 and said controller 206, be used for when the force value of said gs-oil separator 201 gases surpasses threshold value, carrying out superpressure and report to the police.

In a kind of production metering of oil wells device of the utility model, be provided with soft measurement mechanism in the processor 216, can be through soft measurement mechanism at the line computation output of fluid.Wherein the computational process of soft measurement mechanism is following:

Suppose that being one with λ in the oil well measurement process measures time step, corresponding output is respectively q ₁, q ₂..., q _n, these output are separate.Here think that one day true output is μ, can know arithmetic mean of instantaneous value by the law of large numbers

Convergence in (with)probability is in μ, and this shows when n is very big, sample q ₁, q ₂..., q _nArithmetic mean of instantaneous value

Approach the actual value of oil well metering in day output, that is: E (q _i)=μ.Because the q of each metering _iWith respect to

The capital produces a random error, ε _i(i=1,2 ... n), therefore: q _i=μ+ε _i(1)

The mathematic expectaion and the variance of this sample error are expressed as:

E(ε _i)＝0 (2)

V(ε _i)＝σ ² (3)

Character by mathematic expectaion and variance can be known:

E(q _i)＝E(μ)+E(ε _i)＝μ (4)

V(q _i)＝V(ε _i)＝σ ² (5)

The output of measuring for n time and be:

$q=\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{q}_i---\left(6\right)$

Can know by central-limit theorem; The convergence in distribution of stochastic variable summation is in normal distribution, i.e.

Normal Distribution.Can know again:

$E\left(q\right)=\underset{i=1}{\overset{n}{\mathrm{\Σ}}}E\left(q_i\right)=\mathrm{n\μ}---\left(7\right)$

$V\left(q\right)=\underset{i=1}{\overset{n}{\mathrm{\Σ}}}V\left(q_i\right)=n{\mathrm{\σ}}^2---\left(8\right)$

The arithmetic mean of instantaneous value of measuring for n time does,

so

$P\left\{\right|\frac{q}{n}-\mathrm{\&mu;}|<\mathrm{\&delta;}\}=P\left\{\right|q-n|<\mathrm{n\&delta;}\}---\left(9\right)$

Following formula is put in order

$P\left\{\right|q^{*}|<\frac{\mathrm{n\&delta;}}{\mathrm{\&sigma;}}\}$

$=P\{\frac{\mathrm{n\&delta;}}{\mathrm{\&sigma;}}<q^{*}<\frac{\mathrm{n\&delta;}}{\mathrm{\&sigma;}}\}$

$\&ap;\mathrm{\&Phi;}\left(\frac{\mathrm{n\&delta;}}{\mathrm{\&sigma;}}\right)-\mathrm{\&Phi;}(-\frac{\mathrm{n\&delta;}}{\mathrm{\&sigma;}})$

$=2\mathrm{\&Phi;}\left(\frac{\mathrm{n\&delta;}}{\mathrm{\&sigma;}}\right)-1---\left(10\right)$

If the error delta and the probable value α that require are known, then

By asking $P\left\{\right|\frac{q}{n}-\mathrm{\&mu;}|<\mathrm{\&delta;}\}\&GreaterEqual;\mathrm{\&alpha;}---\left(11\right)$

Can be exchanged into

$\mathrm{\&Phi;}\left(\frac{\mathrm{n\&delta;}}{\mathrm{\&sigma;}}\right)\&GreaterEqual;\frac{1+\mathrm{\&alpha;}}{2}---\left(12\right)$

Can draw the sample number n that is asked through looking into gaussian distribution table, and then try to achieve needed best metering time t=n * λ, λ is a time step.

Oil recovery factory, Liaohe Oil Field one day creation data of well is carried out sample calculation analysis, the true output of this well is 9.77 tons/day at present.In data statistic analysis, the metering step-length of choosing is 5min, amounts to 288 step-lengths (be every day 1440 minutes), and the corresponding yield values of each step-length is as shown in table 1:

The every 5min of table 1F55-43 well is (being converted into) daily fluid production rate of step-length

Utilize soft measurement mechanism to calculate, the variance that can try to achieve this well error in dipping according to formula (3) is:

$V\left({\mathrm{\&epsiv;}}_i\right)={\mathrm{\&sigma;}}^2$

$=\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{(q_i-\stackrel{2}{Q})}^2/n$

$=[{(0.00-9.77)}^2+{(2.01+9.77)}^2+{(11.01-9.77)}^2+...+{(12.01-9.77)}^2]/n$

$=241.70$

: σ=15.54

Getting error in dipping and fiducial probability is: δ=0.49, α=0.9

By formula (12) $\mathrm{\&Phi;}\left(\frac{\mathrm{N\&delta;}}{\mathrm{\&sigma;}}\right)\&GreaterEqual;\frac{1+\mathrm{\&alpha;}}{2},$

$\mathrm{\&Phi;}\left(\frac{\mathrm{n\&delta;}}{\mathrm{\&sigma;}}\right)\&GreaterEqual;0.95$

Look into gaussian distribution table, Φ (1.65) >=0.95

That is: substitution given value is tried to achieve n ≈ 53, i.e. n λ=265 minute.

That is to say that this well is 5% satisfying error in dipping, fiducial probability is (i.e. a situation more than 90%) under 90% the situation, and the best gauging time of this well is 4 hours 25 minutes.

The production metering of oil wells device of employing the utility model can be realized the automatic gauge of casinghead gas, output of fluid; Greatly reduce working strength of workers; Application results is more obvious in a producing well; Improve metering efficient when guaranteeing measuring accuracy, scientific and effectively instructed oil well measurement production.The utility model if can large scale application, will create remarkable social benefit and economic benefit.

Claims (4)

1. production metering of oil wells device is characterized in that comprising:

Gs-oil separator, glass-tube liquid level meter, differential pressure pick-up, differential pressure transmitter, controller;

Said gs-oil separator is provided with the output object import, and its inside is provided with pool, the end and crude oil district, and its bottom is provided with the crude exports pipeline, and its top is provided with the gas vent pipeline;

Said glass-tube liquid level meter is arranged at the below of output object import, and its two ends are communicated with the top, crude oil district and the pool, the end of said gs-oil separator respectively;

The two ends of said differential pressure pick-up are arranged at the two ends of said glass-tube liquid level meter respectively;

Said differential pressure transmitter is connected with the two ends of said differential pressure pick-up respectively;

Said controller is connected with said differential pressure transmitter.

2. production metering of oil wells device according to claim 1; It is characterized in that; The crude exports pipeline of said gs-oil separator is provided with first electrically operated valve; The gas vent pipeline of said gs-oil separator is provided with second electrically operated valve, and said first electrically operated valve all is connected with said controller with said second electrically operated valve.

3. production metering of oil wells device according to claim 2 is characterized in that also comprising: the gas flowmeter of metering gas flow is arranged at said gas vent pipeline and is connected with said controller.

4. production metering of oil wells device according to claim 1 is characterized in that also comprising: can carry out the electro connecting pressure gauge that superpressure is reported to the police, it is connected with said gs-oil separator and said controller.

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