CN110630246B - Automatic measuring device and method for liquid production amount of oilfield production well - Google Patents

Abstract

The invention discloses an automatic measuring device and method for the liquid production amount of an oilfield production well, wherein the device comprises the following components: a controller and a measuring device body; the measuring device body includes: the device comprises a first electromagnetic valve, a separator, a liquid level sensor group and a pipeline pump; the controller is respectively connected with the first electromagnetic valve and the pipeline pump in a control way; the controller is in communication connection with the liquid level sensor group; the liquid level sensor group comprises at least three liquid level sensors which are arranged on the inner wall of the separator from bottom to top according to preset distances; the input end of the first electromagnetic valve is connected with a wellhead pipeline, and the output end of the first electromagnetic valve is connected with a first inlet at the top of the separator; one end of the pipeline pump is connected with the discharge port of the separator; the other end is connected with the output main pipeline. According to the device, according to the connection between the controller and the liquid level sensors, the first electromagnetic valve and the pipeline pump, the flow is counted and calculated in real time, so that the automation of the measurement process is realized, and the measurement accuracy and the measurement efficiency are improved.

Description

Automatic measuring device and method for produced fluid volume of oilfield production well

Technical Field

The invention relates to the technical field of oil field measurement, and in particular to an automatic measurement device and method for the produced liquid volume of an oil field production well.

Background Art

Single well metering of oil wells is a necessary means for dynamic analysis and data collection of oilfield development. Due to the relatively short conventional oil well metering cycle, oilfields have mostly used multi-well metering stations to complete the measurement over the years. At present, there are five commonly used methods for oil well metering in oilfields at home and abroad: (1) horizontal elevated tank oil measurement; (2) glass tube oil measurement; (3) tipping bucket oil measurement; (4) liquid level recovery method; (5) work diagram method.

In the existing technology, the horizontal elevated tank oil measurement method, glass tube flowmeter and tipping bucket oil measurement method are relatively primitive, labor-intensive, low in accuracy and poor in reliability. Especially for the measurement of super-heavy oil well production, the speed is very slow, the gas is not easy to be discharged, and it takes more than 4 hours to settle, which cannot achieve real-time online measurement. In recent years, some domestic oil fields have adopted the liquid level recovery method and the work chart method for measurement. Since these two measurement methods require a large amount of oil well production data, it is difficult for the computer to automatically identify the work chart, and some empirical parameters are required, there are large human factors, resulting in large measurement errors and unsatisfactory use effects. All these have brought huge bottlenecks to the promotion of oil well automation technology.

It can be seen that seeking an automated method for measuring the amount of produced fluid in oil field production wells that can achieve real-time online measurement and has more accurate measurement results has become a technical problem that needs to be urgently solved by technical personnel in this field.

Summary of the invention

In view of the above problems, the present invention provides an automatic measuring device and method for the produced fluid volume of oil field production wells, which can solve at least some of the above technical problems.

In a first aspect, an automatic measuring device for the amount of produced fluid in an oilfield production well comprises: a controller and a measuring device body;

The measuring device body comprises: a first solenoid valve, a separator, a liquid level sensor group and a pipeline pump;

Wherein: the controller is respectively connected to the first solenoid valve and the pipeline pump for control; the controller is connected to the liquid level sensor group for communication;

The liquid level sensor group includes at least three liquid level sensors, which are arranged on the inner wall of the separator from bottom to top according to a preset distance; they are marked as the lowest L position, the middle i position and the highest H position respectively;

The input end of the first solenoid valve is connected to the wellhead pipeline, and the output end is connected to the first inlet at the top of the separator;

One end of the pipeline pump is connected to the discharge port of the separator, and the discharge port is located below the L position; the other end is connected to the output main pipeline.

Furthermore, a three-way pipe fitting is provided on the pipeline connecting the other end of the pipeline pump to the output main pipeline;

The first end of the three-way pipe fitting is connected to the other end of the pipeline pump;

The second end of the three-way pipe is connected to the pipeline of the output main pipeline through a second solenoid valve;

The third end of the three-way pipe is connected to the second inlet of the separator through a third solenoid valve; the second inlet is located above the H position;

The controller is control-connected to the second solenoid valve and the third solenoid valve respectively.

Furthermore, the controller is a PLC controller or an industrial computer.

Furthermore, the controller is also provided with: a wireless communication module; the controller is connected to a remote terminal via wireless communication.

Furthermore, the wireless communication module includes one or more of the following:

WIFI module, public mobile communication network module, Bluetooth module, near field communication module.

In a second aspect, an embodiment of the present invention further provides an automatic measurement method for the amount of produced fluid in an oilfield production well, which uses the measurement device described in any of the above embodiments to measure the amount of produced fluid in an oilfield production well, including the steps of:

S1, start the pipeline pump through the controller to reduce the liquid level in the separator to position L; the pipeline pump stops working;

S2, control the first solenoid valve to open, discharge the medium until the liquid level reaches the H position; and record the time when the liquid level reaches the i position and the H position respectively; calculate the flow rate between any two adjacent liquid level sensors, and display the maximum flow rate, minimum flow rate and average flow rate of a single measurement;

S3, when the liquid level reaches the H position, the controller starts the pipeline pump to lower the medium in the separator to the L position, and the single measurement ends; steps S2 and S3 are executed cyclically to repeat the measurement of the production well.

Furthermore, the method further comprises:

S4. After the medium liquid volume measurement is completed, the controller controls the first solenoid valve to open and inject the medium to a preset liquid level; controls the first solenoid valve and the second solenoid valve to close, starts the pipeline pump and the third solenoid valve to clean the liquid level sensor;

S5. When the cleaning time reaches a preset time, the controller controls the third solenoid valve to close and opens the second solenoid valve to forcefully discharge the cleaned medium in the separator.

An embodiment of the present invention provides an automatic measurement device and method for the amount of produced liquid in an oil field production well. The device adopts the principle of volumetric method, and arranges multiple liquid level sensors at different heights at preset distances inside a separator. According to the connection between a controller and the multiple liquid level sensors, a first solenoid valve and a pipeline pump, the flow rate is counted and calculated in real time, thereby realizing the automation of the measurement process and improving the measurement accuracy and efficiency.

Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description, claims, and drawings.

The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

FIG1 is a schematic diagram of the structure of an automatic measuring device for the amount of produced fluid from an oil field production well provided by an embodiment of the present invention;

FIG. 2 is a schematic diagram of the structure of the connection between the controller and multiple components provided by an embodiment of the present invention.

FIG3 is a flow chart of an automatic measurement method for the amount of produced fluid from an oil field production well provided by an embodiment of the present invention.

In the accompanying drawings: 1-controller, 2-measuring device body, 21-first solenoid valve, 22-separator, 23-liquid level sensor group, 24-pipeline pump, 25-second solenoid valve, 26-third solenoid valve.

DETAILED DESCRIPTION

The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

1 , an automatic measuring device for the amount of produced fluid in an oilfield production well provided in an embodiment of the present invention comprises: a controller 1 and a measuring device body 2;

The measuring device body 2 includes: a first electromagnetic valve 21, a separator 22, a liquid level sensor group 23 and a pipeline pump 24. The controller 1 is respectively connected to the first electromagnetic valve 21 and the pipeline pump 24; the controller 1 is connected to the liquid level sensor group 23 in communication; the separator is, for example, a cylindrical container, and the liquid level sensor group 23 includes at least three liquid level sensors, which are arranged on the inner wall of the separator 22 from bottom to top according to a preset distance; they are respectively marked as the lowest L position, the middle i position and the highest H position; the liquid level sensor is, for example, a switch type sensor, which is used to determine the liquid level, and is numbered and marked as L position, 1 position, 2 position, 3 position, ..., H position, wherein L position is the lowest switch type sensor, and H position is the highest liquid level sensor.

The number of liquid level sensors set is related to the medium and flow rate of the production well pipeline. When the flow rate is large, a smaller number of liquid level sensors can be set; when the flow rate is small, a larger number of liquid level sensors need to be set; this can ensure the measurement accuracy of the produced liquid volume of the oil field production wells.

The input end of the first solenoid valve 21 is connected to the wellhead pipeline, and the output end is connected to the first inlet at the top of the separator 22; one end of the pipeline pump 24 is connected to the discharge port of the separator 22, which is located below the L position; the other end is connected to the output main pipeline.

The separators are regular cylindrical containers with the same bottom cross-sectional area, wherein the preset distances may be, for example, equal spacing or non-equal spacing.

The calculation process is as follows:

V _i =πR ² D

In the formula, R is the radius of the cylinder, πR ² is the bottom cross-sectional area, arbitrarily is the distance D between the two liquid level sensors, _{Vi is} the volume within a specific time, and the specific time is the time difference between the two liquid level sensors recorded; the calculated multiple _Vi , and then calculate the average value V per unit time (for example, in hours). For example, if the production well works for 8 hours, the total liquid output is: 8V.

In this embodiment, the device adopts the principle of volumetric method. The separator is a regular cylindrical container with the same bottom cross-sectional area. For example, multiple liquid level sensors of different heights are arranged at equal intervals inside the separator. The volume between different liquid levels is a fixed value. The controller can record the time when the medium reaches different liquid levels and calculate the flow rate per unit time according to the signal fed back by the liquid level sensor. When the liquid level reaches the H position, the liquid level measurement is completed and the forced discharge pump is started. When the liquid level drops to the L position, the pump stops working. When the liquid level rises, the system starts measuring.

The measurement process and working principle are as follows:

(1) Start the separator pipeline pump to lower the liquid level in the separator to position L; to ensure the accuracy of the measurement, empty the medium in the separator. Then open the first solenoid valve, the production well output fluid begins to be discharged, the liquid level in the separator rises, and the liquid level passes through position 1, position 2, position 3... position H, and record the time when the liquid level reaches different liquid level sensors;

(2) When the liquid level reaches the H position, the single measurement ends, and the system calculates the flow rates of 1-2, 2-3, 3-4, and H-1-H respectively. The display interface gives the maximum flow rate, minimum flow rate, and average flow rate of the single measurement. Based on the average flow rate and the daily working hours, the liquid output of the oil field production wells can be calculated.

(3) After the measurement is completed and the liquid level reaches the H position, close the first solenoid valve and start the pipeline pump to discharge the medium, lowering the liquid level to the L position. A new cycle can begin and repeated measurement can be performed on the same production well.

The controller is respectively connected with a plurality of liquid level sensors, the first solenoid valve and the pipeline pump, and the flow rate is counted and calculated in real time, thereby realizing the automation of the measurement process and improving the measurement accuracy and efficiency.

In one embodiment, a three-way pipe fitting is also provided on the pipeline of the output main pipeline connected to the other end of the pipeline pump 24; the other end of the pipeline pump 24 is connected to the first end of the three-way pipe fitting; the second end of the three-way pipe fitting is connected to the pipeline of the output main pipeline through a second solenoid valve 25; the third end of the three-way pipe fitting is connected to the second inlet of the separator 22 through a third solenoid valve 26; wherein the second inlet is located above the highest position sensor, i.e., the H position.

In this embodiment, after the measurement is completed, the surface of the liquid level sensor inside the separator needs to be cleaned to avoid errors or inaccurate measurements in the next measurement. For example, the crude oil in the separator also contains some mud, viscous substances and corrosive substances, and the substances adhering to the liquid level sensor need to be cleaned. The water content of the produced crude oil is relatively high, and the crude oil can be used to clean it. In this embodiment, the device can realize automatic cleaning and forcibly remove the medium of the separator to ensure the state of the separator and prepare for the next measurement.

The specific automatic cleaning process is as follows:

1) According to the oil quality of the medium, such as the amount of water content, the corresponding cleaning time can be set. For example, when the water content of the oil is above 90%, the cleaning time can be about 30 minutes. After the measurement is completed, the controller controls the first solenoid valve to open and inject a part of the medium into the separator. For example, when the injected volume is more than half of the volume of the separator, that is: after obtaining the feedback signal of a certain liquid level sensor in the middle, the first solenoid valve is closed, the pipeline pump and the third solenoid valve are opened, and the second solenoid valve is closed at the same time; forming a circulation flushing of the separator, pipeline pump and the third solenoid valve.

2) When the cleaning time reaches the preset time, such as 30 minutes, the controller closes the third solenoid valve and opens the second solenoid valve to drain the cleaning medium in the separator to ensure the state of the separator and prepare for the next measurement.

Automatic cleaning can achieve maintenance-free operation, thereby extending the service life of the measuring device and improving measurement accuracy. After cleaning, the medium in the separator is forced to be emptied through the pipeline pump to prevent scaling in the container.

Further, as shown in FIG. 2 , the controller 1 may be, for example, a PLC controller, which is a programmable logic controller (PLC), a digital electronic device with a microprocessor, and a digital logic controller for automatic control. The PLC controller may load the control instructions of the first solenoid valve, the second solenoid valve, the third solenoid valve, and the pipeline pump into the memory for storage and execution.

In addition, the controller 4 may also be an industrial computer, which has important computer properties and features, such as a computer CPU, hard disk, memory, peripherals and interfaces, an operating system, a control network and protocol, computing power, and a friendly human-computer interface. For example, the measuring device may be provided with a temperature sensor, a pressure sensor, a concentration meter, etc. on the pipeline or in the separator, and the feedback data of the above-mentioned sensor equipment may be obtained through the industrial computer, such as displaying parameters such as temperature, pressure, and concentration.

Furthermore, the controller may also be provided with a wireless communication module to achieve connection with a remote terminal, receive control instructions from the remote terminal, and also feedback relevant parameters of the real-time working status, so as to achieve remote control of the measurement time and frequency, and meet the actual needs of oil field production. Among them, the wireless communication module may be any one of a WIFI module, a public mobile communication network communication module, a Bluetooth module, and a near field communication module. The public mobile communication network communication module may be a 2G, 3G, 4G, 5G communication module of various standards, and the near field communication module may be an NFC (Near Field Communication) module, etc.

Based on the measuring device of the above embodiment, the invention also provides a measuring method to realize automatic measurement of the produced fluid volume of oil field production wells, as shown in FIG3 , comprising the steps of:

S1, control the start of pipeline pump and solenoid valve through PLC controller to reduce the liquid level in the separator to L position;

S1, start the pipeline pump through the controller to reduce the liquid level in the separator to position L; the pipeline pump stops working;

S2, control the first solenoid valve to open, discharge the medium until the liquid level reaches the H position; and record the time when the liquid level reaches the i position and the H position respectively; calculate the flow rate between any two adjacent liquid level sensors, and display the maximum flow rate, minimum flow rate and average flow rate of a single measurement;

S3. When the liquid level reaches position H, the controller starts the pipeline pump to lower the medium in the separator to position L, and receives a single measurement. When multiple measurements are required according to preset conditions, steps S2 and S3 can be executed cyclically to repeat the measurement of the production well.

After the measurement is completed, the cleaning and forced exhaust steps are as follows:

S4. After the medium liquid volume measurement is completed, the controller controls the first solenoid valve to open and inject the medium to a preset liquid level; controls the first solenoid valve and the second solenoid valve to close, starts the pipeline pump and the third solenoid valve to clean the liquid level sensor;

S5. When the cleaning time reaches a preset time, the controller controls the third solenoid valve to close and opens the second solenoid valve to forcefully discharge the cleaned medium in the separator.

In this embodiment, the separator pipeline pump is started to reduce the liquid level in the separator to position L; the production well output fluid begins to be discharged, the liquid level in the separator rises, and the liquid level passes through position 1, position 2, position 3 ... position H, and the time when the liquid level reaches different liquid level sensors is recorded;

When the liquid level reaches the H position, the single measurement ends, and the controller calculates and obtains the flow rates of 1-2, 2-3, 3-4, and H-1-H positions respectively. The display interface gives the maximum flow rate, minimum flow rate, and average flow rate of the single measurement;

When the liquid level reaches the H position, the control pipeline pump and the second solenoid valve are started to lower the liquid level to the L position, and a new cycle can begin, and the same production well can be repeatedly metered; after the liquid volume measurement is completed, the first solenoid valve is started to inject the medium, and then the first and second solenoid valves are closed; the third solenoid valve and the pipeline pump are started to rinse and clean the surface of the liquid level sensor.

After cleaning, close the third solenoid valve, open the second solenoid valve, and drain the cleaning medium in the separator through the pipeline pump to ensure the state inside the separator and prepare for the next measurement.

The embodiment of the present invention provides an automatic measurement method for the produced liquid volume of an oil field production well, which realizes the automation of the measurement process and the automation of cleaning through the control connection between the controller and each component; through the real-time statistics and calculation of the flow rate, the real-time measurement of the liquid volume is realized, and the measurement accuracy is improved. In addition, the liquid level sensor can be automatically cleaned to extend the life of the equipment and improve the measurement accuracy.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims (4)

1. An automatic measuring method for the liquid production amount of an oilfield production well is characterized in that an automatic measuring device is adopted to measure the liquid production amount of the oilfield production well; the automatic measurement device includes: a controller (1) and a measuring device body (2);

The measuring device body (2) includes: a first electromagnetic valve (21), a separator (22), a liquid level sensor group (23) and a pipeline pump (24);

Wherein: the controller (1) is respectively connected with the first electromagnetic valve and the pipeline pump (24) in a control way; the controller (1) is in communication connection with the liquid level sensor group (23);

The liquid level sensor group (23) comprises at least three liquid level sensors, and is arranged on the inner wall of the separator (22) from bottom to top according to a preset distance; marked as the lowest L bit, the middle i bit and the highest H bit respectively;

The input end of the first electromagnetic valve (21) is connected with a wellhead pipeline, and the output end of the first electromagnetic valve is connected with a first inlet at the top of the separator (22);

one end of the pipeline pump (24) is connected with a discharge port of the separator (22), and the discharge port is positioned below the L position; the other end is connected with an output main pipeline;

a three-way pipe fitting is further arranged on a pipeline of which the other end is connected with the output main pipeline;

the first end of the three-way pipe fitting is connected with the other end of the pipeline pump (24);

The second end of the three-way pipe fitting is connected with the pipeline of the main output pipeline through a second electromagnetic valve (25);

the third end of the three-way pipe fitting is connected with the second inlet of the separator (22) through a third electromagnetic valve (26); the second inlet is positioned above the H bit;

The controller (1) is respectively connected with the second electromagnetic valve (25) and the third electromagnetic valve (26) in a control way;

the automatic measurement method comprises the following steps:

S1, controlling a pipeline pump to start through a controller, and reducing the liquid level in a separator to L; the pipeline pump stops working;

s2, controlling the first electromagnetic valve to be opened, and discharging the medium until the liquid level reaches the H position; and respectively recording the time when the liquid level reaches the i bit and the H bit; calculating the flow between any two adjacent liquid level sensors in a statistics way, and displaying the maximum flow, the minimum flow and the average flow which are measured once;

S3, enabling the liquid level to reach an H position, and enabling the controller to control the pipeline pump to start so as to reduce the medium in the separator to an L position; ending the single measurement; step S2 and step S3 are circularly executed, and repeated metering is carried out on the production well;

s4, after the measurement of the medium liquid amount is finished, the controller controls the first electromagnetic valve to open the injected medium to a preset liquid level; the first electromagnetic valve and the second electromagnetic valve are controlled to be closed, the pipeline pump and the third electromagnetic valve are started to work, and the liquid level sensor is cleaned;

And S5, after the cleaning time reaches the preset time, the controller controls the third electromagnetic valve to be closed, and the second electromagnetic valve is opened to forcedly discharge the cleaned medium in the separator.

2. An automatic measuring method for the liquid production amount of an oilfield production well according to claim 1, wherein the controller (1) is a PLC controller or an industrial personal computer.

3. An automatic measurement method of the fluid production from an oilfield production well according to claim 2, wherein the controller (1) is further provided with: a wireless communication module; the controller (1) is connected with a remote terminal in a wireless communication mode.

4. A method for automatically measuring the amount of fluid produced from an oilfield production well as defined in claim 3, wherein the wireless communication module comprises one or more of: the system comprises a WIFI module, a public mobile communication network communication module, a Bluetooth module and a near field communication module.