CN111636860A - Oil well automatic meter using weighing method - Google Patents
Oil well automatic meter using weighing method Download PDFInfo
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- CN111636860A CN111636860A CN202010509302.7A CN202010509302A CN111636860A CN 111636860 A CN111636860 A CN 111636860A CN 202010509302 A CN202010509302 A CN 202010509302A CN 111636860 A CN111636860 A CN 111636860A
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- Prior art keywords
- tank
- liquid
- oil well
- measuring
- automatic
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q50/00—Systems or methods specially adapted for specific business sectors, e.g. utilities or tourism
- G06Q50/02—Agriculture; Fishing; Mining
Abstract
The invention discloses an oil well automatic meter adopting a weighing method, which is particularly suitable for the metering application of an oil well with large air volume. The meter consists of a measuring tank, a storage tank, an electric valve, a differential pressure transmitter, an automatic controller, a gas flowmeter, a check valve, a manifold and the like, wherein all electric devices and instruments are connected with the automatic controller. The liquid that comes into the oil well gets into the measuring tank, measures the quality value of jar interior liquid measure in real time by differential pressure transmitter cooperation automatic control, waits to reach the predetermined value, and the electric valve of lower part opens, and under gaseous promotion, the liquid in the measuring tank can discharge into the storage tank fast. Each time the liquid filling of the tank is measured, the liquid filling value and the liquid filling time are measured, and the instantaneous flow value of the tank is obtained. The liquid filling and discharging of the tank are measured for many times, and the liquid flow of the oil well in the time period can be obtained through integration and corresponding mathematical compensation. The meter is matched with a gas flowmeter and a corresponding pipeline to measure the gas production.
Description
Technical Field
The invention relates to equipment and technology for automatically metering liquid production and gas production of an oil well, and belongs to the technical field of oil well production metering of oil fields.
Background
The crude oil extraction of oil wells of various oil fields mostly enters a secondary oil extraction stage, and many oil wells adopt methods such as gas drive (injecting carbon dioxide or nitrogen), fire drive (controlling combustion at the bottom of a well), steam drive (injecting steam) and the like to carry out crude oil lifting production. In the oil well exploitation method and the oil well exploitation process, the gas yield is high (the gas-liquid ratio is more than 50), the produced crude oil has high viscosity, and the crude oil is mixed with more bubbles and is not easy to separate. The liquid production capacity of the oil well needs to be accurately measured by a gravimetric method if the error is large in a volume measurement mode.
Disclosure of Invention
The invention provides an oil well liquid production automatic meter with a weighing mode aiming at the metering problem of a high-gas-flow oil well, which utilizes the characteristic of high gas production of the oil well, adopts a tank for storing liquid and a rapid emptying mode for repeated measurement, solves the metering problems of high-gas-flow and high-viscosity oil wells such as gas drive (injecting carbon dioxide or nitrogen), fire drive (controlling combustion at the bottom of a well), steam drive (injecting steam) and the like, and has the advantages of small volume, simple structure, economy and durability.
The invention relates to a weighing method oil well automatic meter, which adopts the following technical scheme:
the meter adopts two jar body structures from top to bottom, and upper portion is the measuring tank, and the lower part is the storage tank, and the upper portion of two jar bodies is with the pipeline intercommunication. A differential pressure transmitter is arranged on the measuring tank, a lower end sensor of the differential pressure transmitter is arranged at the height of a liquid outlet at the bottom of the tank body, and an upper end sensor is arranged at the top of the tank body; the differential pressure transmitter is matched with the automatic controller to measure and calculate the quality of liquid in the tank body.
The bottom of the measuring tank is provided with an electric valve and a pipeline, the pipeline is communicated with the storage tank, and the electric valve is controlled by the automatic controller to act. Under the condition that the electric valve is closed, the oil well mixed liquid from the oil well pipeline enters the measuring tank, and the quality value of the liquid entering the tank and the corresponding time are measured in real time by the differential pressure transmitter in cooperation with the automatic controller. When the liquid inlet amount reaches the preset value of the differential pressure transmitter, the automatic controller controls the electric valve to open, so that the liquid in the measuring tank rapidly and automatically flows into the lower storage tank.
After the oil well crude oil mixed liquid enters the storage tank, under the action of gas, the liquid is discharged to a production main line through a liquid outlet pipe at the bottom of the storage tank, and the storage tank still forms a whole space of full gas to prepare for receiving the liquid of a next measuring tank.
The measuring tank adopts a vertical structure, and adopts a cylindrical, rectangular or square tank body with unchanged sectional area in the vertical direction, and the calculation formula of the mass of liquid in the tank is as follows:
M＝ΔP*S/98
wherein: m-mass of liquid in tank, kg
Δ P-measured value of differential pressure transmitter, kPa
S-sectional area of can body, cm2
The automatic controller measures the total mass m of the filling liquid in the measuring tank body according to the value of the differential pressure transmitteriAnd the time t of filling liquid this timei(ii) a While measuring the time t during which the tank is emptied of liquidi' (a differential pressure value of 0 indicates that the liquid in the measurement tank is completely drained).
At the emptying time tiInner oil well instantaneous flow mass value mi' calculate according to the following compensation:
mi’＝mi*(ti’/ti)
thus, the automatic controller calculates the time period (t) of the current timei+ti') amount of liquid:
Wi＝mi+mi*(ti’/ti)kg
wherein: wi-measuring the total amount of well fluid production, kg, of the tank in the ith fill and drain
miMeasuring the measured amount of liquid in the tank during the ith filling period, kg
mi' - - - - -measuring the compensated flow value, kg, of the tank during the i-th emptying period
tiMeasuring the time required for the ith filling of the tank, s
ti' - - - -measuring the time required for the ith emptying of the tank, s
In order to measure the oil well liquid production rate in one time of filling and draining the tank, the meter completes the actions n times in the T (hour) period, and the liquid production rate in the T (hour) period of the oil well is as follows:
W＝∑Wikg
wherein: i is 1,2,3 … … n.
Therefore, the automatic controller converts the daily liquid production of the oil well:
Qd＝(24/T)*(W/1000)t/d
a check valve and a gas flowmeter are arranged on a forward communicating pipeline from the measuring tank to the storage tank, and the gas production of the oil well is measured.
Drawings
FIG. 1 is a schematic diagram of an automatic weighing oil well meter according to the present invention.
Wherein: 1-liquid inlet pipeline, 2-measuring tank, 3-differential pressure transmitter, 4-automatic controller, 5-electric valve, 6-forward communicating pipe, 7-check valve, 8-gas flowmeter, 9-reverse communicating pipe, 10-check valve, 11-storage tank and 12-liquid outlet pipeline
Detailed description of the invention
1. The liquid inlet pipe 1 is communicated with the oil well pipeline for liquid inlet, and the liquid outlet pipe 12 is connected to the trunk line.
2. The incoming oil from the oil well pipe enters the measuring tank 2 through the pipe 1, and the electric valve 5 is closed.
3. The automatic controller 4 measures the mass value of the liquid volume in the measuring tank 2 in real time by using the differential pressure transmitter 3, and simultaneously measures the time value of the liquid entering the tank. The general measuring tank is a cylindrical tank or a rectangular tank, and the calculation formula of the liquid mass in the tank is as follows:
M＝ΔP*S/98
wherein: m-mass of liquid in tank, kg
Δ P-measured value of differential pressure transmitter, kPa
S-sectional area of can body, cm2
4. The liquid inlet volume in the tank 2 to be measured reaches the preset differential pressure value, the control box 4 controls the electric valve 5 to be opened, and the liquid in the measuring tank can be promoted to rapidly flow into the storage tank 11 due to the large gas volume of the oil well, and then the liquid is continuously discharged from the liquid discharge pipeline 12. At this time, the automatic controller 4 automatically measures the emptying time of the measuring tank.
In the process of discharging the liquid in the measuring tank 2 into the storage tank 11, the liquid can extrude the gas in the storage tank, and the gas enters the measuring tank through the reverse communicating pipe 9 and the check valve 10, so that the liquid flow is not blocked.
5. In the liquid discharging process of the measuring tank 2, the automatic controller 4 collects the numerical value of the differential pressure transmitter 3 in real time, and when the numerical value is 0, the emptying time of the measuring tank is obtained at the moment, and the electric valve 5 is controlled to be closed at the same time. The measuring tank enters the next measuring process of liquid feeding and discharging.
6. After the liquid in the measuring tank 2 enters the storage tank 11, the gas is reserved at the upper part of the storage tank 1, the liquid can be discharged firstly through the liquid discharge pipe 12, and the storage tank can still form a space which is full of gas, so that the next time the liquid in the measuring tank 2 is received is prepared.
7. The automatic controller measures the total mass m of the liquid filled in the first tank body according to the value of the differential pressure transmitteriAnd the time t of filling liquid this timei(ii) a While measuring the time t during which the tank is emptied of liquidi’。
At the emptying time tiInner oil well instantaneous flow mass value mi' calculate according to the following compensation:
mi’＝mi*(ti’/ti)
thus, the automatic controller calculates the time period (t) of the current timei+ti') amount of liquid:
Wi＝mi+mi*(ti’/ti)kg
wherein: wi-measuring the total amount of well fluid production, kg, of the tank in the ith fill and drain
miMeasuring the total amount of liquid measured in the tank during the i-th filling period, kg
mi' - - - - -measuring the compensated flow value, kg, of the tank during the i-th emptying period
tiMeasuring the time required for the ith filling of the tank, s
ti ’-measuring the time required for the ith emptying of the tank, s 8, the above-mentioned calculation of the oil well production in the first filling and draining of the tank, the meter completing such an action n times during the T (hour) period, the production of the oil well during the T (hour) period:
W＝∑Wikg
wherein: i is 1,2,3 … … n.
Therefore, the automatic controller converts the daily liquid production of the oil well:
Qd＝(24/T)*(W/1000)t/d
9. a check valve 7 and a gas flowmeter 8 are arranged on a forward communication pipeline 6 between the measuring tank and the storage tank, and the gas production of the oil well is measured simultaneously in the process of measuring the liquid inlet of the tank 2.
Because the gas flowmeter is an accumulated standard condition display, the automatic controller 4 can directly acquire the start and stop values of the gas flowmeter 8, and the gas yield in the time period can be calculated.
The above description is only a preferred embodiment of the present invention and is not intended to limit the scope of the present invention. Any modification, addition, or equivalent substitution made within the technical spirit and principle of the present invention is still within the protection scope of the present invention.
Claims (10)
1. The automatic oil well meter consists of two tanks, electrically operated valve, differential pressure transmitter, gas flowmeter, check valve and pipeline, automatic controller, liquid inlet and outlet pipeline, and each electrically operated device and instrument is connected to the automatic controller.
2. The automatic gravimetric well meter of claim 1 wherein the two tanks are comprised, the first tank being a measuring tank and the second tank being a storage tank.
3. The automatic weighing oil well meter as defined in claim 2, wherein the two tanks are mounted in a vertical structure with the measuring tank on top and the storage tank on bottom and are stacked directly or in a split manner; the volume of the storage tank is not less than the volume of the measuring tank.
4. The automatic gravimetric oil well dispenser of claim 2 wherein the upper portions of the two tanks are in communication by an air communication tube.
5. The automatic gravimetric oil well meter of claim 2 wherein the gas communication lines of the two tanks are in forward and reverse gas communication through check valves, with forward gas communication from the first tank to the second tank and reverse gas communication from the second tank to the first tank. The positive gas communication pipeline is used for measuring the gas yield of the oil well; the reverse gas communication is that when liquid in the first tank body is discharged into the second tank body, the extruded gas in the second tank body can enter the first tank body, so that the normal and smooth flow of the liquid is ensured.
6. The automatic gravimetric well meter of claim 1 wherein the first tank has an electrically operated valve mounted to the bottom thereof and a line connected to the second tank for draining fluid from the first tank to the second tank.
7. The automatic weighing method meter for oil well as recited in claim 1 wherein the automatic controller controls the electric valve to close or open to allow the first tank to store or automatically drain.
8. The automatic gravimetric well gauge of claim 2 wherein the first tank has a differential pressure transmitter mounted thereon, the differential pressure transmitter cooperating with the automatic controller for measuring the mass of the liquid in the tank. The lower end sensor of the differential pressure transmitter is arranged at the height of the liquid outlet at the bottom of the tank body, and the upper end sensor is arranged at the top of the tank body. For a cylindrical, rectangular or square tank body with constant sectional area in the vertical direction, the calculation formula of the liquid mass in the tank is as follows:
M＝ΔP*S/98
wherein: m-mass of liquid in tank, kg
Δ P-measured value of differential pressure transmitter, kPa
S-sectional area of can body, cm2。
9. The method of claim 1 wherein the automated controller measures the total mass m of the fluid in the first tank based on the differential pressure transmitter valueiAnd the time t of filling liquid this timei(ii) a The automatic controller measures the time t in the process of emptying the tank liquid according to the value of the differential pressure transmitteri' (a differential pressure value of 0 indicates that the liquid in the measurement tank is completely drained).
After the liquid in the measuring tank is emptied, the automatic controller controls the electric valve to close, and the next liquid storage and discharge measurement of the measuring tank is carried out.
At the emptying time ti'inner oil well' production fluid quality value mi' calculate according to the following compensation:
mi’＝mi*(ti’/ti)
thus, the automatic controller calculates the time period (t) of the current timei+ti') liquid production from the well:
Wi＝mi+mi*(ti’/ti) kg
wherein: wi-measuring the total amount of well fluid production, kg, of the tank in the ith fill and drain
miMeasuring the measured amount of liquid in the tank during the ith filling period, kg
mi' - - - - -measuring the compensated flow value, kg, of the tank during the i-th emptying period
tiMeasuring the time required for the ith filling of the tank, s
ti' - - - -measuring the time required for the ith emptying of the tank, s
In order to measure the oil well liquid production rate in one time of filling and draining the tank, the meter completes the actions n times in the T (hour) period, and the liquid production rate in the T (hour) period of the oil well is as follows:
W＝∑Wikg
wherein: i is 1,2,3 … … n.
Therefore, the automatic controller converts the daily liquid production of the oil well:
Qd＝(24/T)*(W/1000) t/d。
10. the automatic gravimetric well meter of claim 2 wherein the gas flow meter is mounted in a forward communication line from the first tank to the second tank to measure the gas production from the well. The automatic controller reads and calculates the initial value and the initial value of the gas flowmeter and converts the daily output of the gas of the oil well.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010509302.7A CN111636860A (en) | 2020-06-07 | 2020-06-07 | Oil well automatic meter using weighing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010509302.7A CN111636860A (en) | 2020-06-07 | 2020-06-07 | Oil well automatic meter using weighing method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111636860A true CN111636860A (en) | 2020-09-08 |
Family
ID=72329199
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010509302.7A Pending CN111636860A (en) | 2020-06-07 | 2020-06-07 | Oil well automatic meter using weighing method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111636860A (en) |
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2020
- 2020-06-07 CN CN202010509302.7A patent/CN111636860A/en active Pending
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