CN114413178A - Automatic liquid supply system - Google Patents
Automatic liquid supply system Download PDFInfo
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- CN114413178A CN114413178A CN202111520603.0A CN202111520603A CN114413178A CN 114413178 A CN114413178 A CN 114413178A CN 202111520603 A CN202111520603 A CN 202111520603A CN 114413178 A CN114413178 A CN 114413178A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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Abstract
The application discloses automatic liquid supply system relates to the oil gas and equips the field. An automatic liquid supply system comprising: the device comprises a liquid storage container, a liquid supply pipeline, a liquid return pipeline, a liquid pump device, a first control valve, a second control valve, a pressure detection element and a control device; one end of the liquid supply pipeline is connected with the liquid storage container, the liquid pump device, the first control valve and the pressure detection element are sequentially connected in series with the liquid supply pipeline along the liquid supply direction, and the pressure detection element is close to an outlet of the liquid supply pipeline; one end of the liquid return pipeline is connected to the area of the liquid supply pipeline, which is positioned between the liquid pump device and the first control valve, while the other end is connected to the area of the liquid supply pipeline, which is positioned between the liquid storage container and the liquid pump device, or is connected to the liquid storage container, and the second control valve is arranged on the liquid return pipeline; the liquid pump device, the first control valve, the second control valve and the pressure detection element are all connected with the control device. The application can solve the problems that the manual operation of the current liquid supply equipment is inconvenient, and misoperation is easy to occur.
Description
Technical Field
The application belongs to the technical field of oil gas equipment, and particularly relates to an automatic liquid supply system.
Background
At present, with the development of automation and intellectualization of oilfield equipment, oilfield equipment tends to the direction development of simplicity of operation, comfortable working environment, safe production operation and intellectualization of equipment operation.
However, the prior shaft liquid supply equipment is basically controlled by manual operation, so that the operation is inconvenient, the phenomena of misoperation and the like are easy to occur, and the normal shaft liquid supply operation is influenced or the equipment is damaged.
Disclosure of Invention
The embodiment of the application aims to provide an automatic liquid supply system, which can solve the problems that the manual operation of the existing liquid supply equipment is inconvenient, and misoperation is easy to occur.
In order to solve the technical problem, the present application is implemented as follows:
an embodiment of the present application provides an automatic fluid supply system for supplying fluid to a wellbore, the automatic fluid supply system comprising: the device comprises a liquid storage container, a liquid supply pipeline, a liquid return pipeline, a liquid pump device, a first control valve, a second control valve, a pressure detection element and a control device;
one end of the liquid supply pipeline is connected with the liquid storage container, the liquid pump device, the first control valve and the pressure detection element are sequentially connected in series with the liquid supply pipeline along a liquid supply direction, and the pressure detection element is close to an outlet of the liquid supply pipeline;
one end of the liquid return pipeline is connected to a region of the liquid supply pipeline between the liquid pump device and the first control valve, and the other end of the liquid return pipeline is connected to a region of the liquid supply pipeline between the liquid storage container and the liquid pump device, or the other end of the liquid return pipeline is connected to the liquid storage container, and the second control valve is arranged on the liquid return pipeline;
the liquid pump device, the first control valve, the second control valve and the pressure detection element are all connected with the control device.
In the embodiment of the application, the pressure detection element can detect the liquid pressure at the outlet in the liquid supply pipeline in real time, so that the liquid supply condition in the shaft can be known through the liquid pressure, and the states of the liquid pump device, the first control valve and the second control valve can be adjusted according to the liquid pressure. When the liquid pressure does not meet the liquid supply requirement, the first control valve can be controlled to be opened, the second control valve is controlled to be closed, and the liquid pump device is started to supply liquid to the shaft through the liquid supply pipeline; when the liquid pressure reaches the liquid supply requirement, the first control valve can be controlled to be closed, the second control valve can be controlled to be opened, and the liquid pump device continuously works to carry out liquid internal circulation or control the liquid pump device to stop. Based on the setting, the automatic liquid supply system in the embodiment of the application can realize automatic control of the liquid supply process according to the liquid level condition in the shaft, manual operation control is not needed, and manual participation is reduced, so that the influence on normal liquid supply operation of the shaft and the damage to equipment due to manual misoperation can be relieved, control operation is more convenient and accurate, and efficient and accurate operation of liquid supply operation is ensured.
Drawings
FIG. 1 is a schematic view of an automatic liquid supply system according to an embodiment of the disclosure;
FIG. 2 is a control logic diagram of one embodiment disclosed in the examples of the present application;
fig. 3 is a control logic diagram of another implementation manner disclosed in the embodiment of the present application.
Description of reference numerals:
100-a liquid storage container;
210-a liquid supply pipeline; 220-liquid return pipeline;
300-a liquid pump device; 310-a variable frequency drive; 320-liquid pump body; 330-a transmission;
410-a first control valve; 420-a second control valve;
500-a control device;
610-a pressure detection element; 620-flow sensing element; 630-an identification element; 640-a density detection element;
700-a pulsation damper;
810-oil pipe; 820-a blowout preventer; 830-wellhead four-way.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that embodiments of the application may be practiced in sequences other than those illustrated or described herein, and that the terms "first," "second," and the like are generally used herein in a generic sense and do not limit the number of terms, e.g., the first term can be one or more than one. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/" generally means that a preceding and succeeding related objects are in an "or" relationship.
The embodiments of the present application are described in detail below with reference to the accompanying drawings through specific embodiments and application scenarios thereof.
Referring to fig. 1 to 3, an automatic fluid supply system is disclosed in an embodiment of the present application, which is used for supplying fluid to a wellbore, wherein a wellhead cross-piece 830 is disposed at an opening of the wellbore, a blowout preventer 820 is disposed at the wellhead cross-piece 830, and a tubing 810 penetrates into the wellbore through the blowout preventer 820 and the wellhead cross-piece 830 in sequence. It should be noted that, with respect to the structure of the wellbore, the structure, installation manner and principle of the blowout preventer 820, and the structure, installation manner and principle of the wellhead cross 830, all refer to the related art, and will not be described in detail herein.
The disclosed automatic liquid supply system includes a liquid storage container 100, a liquid supply line 210, a liquid return line 220, a liquid pumping device 300, a first control valve 410, a second control valve 420, a pressure detecting element 610, and a control device 500.
The liquid storage container 100 is a container for containing perfusion liquid. Alternatively, the liquid storage container 100 may be a liquid storage tank, a liquid storage box, a liquid storage bin, etc., and the specific form is not limited.
The liquid supply line 210 is a pipe member for conveying a perfusion liquid. In consideration of the fact that the filling liquid has a certain pressure, when the liquid supply line 210 is selected, a pipe capable of withstanding a certain pressure is selected. One end of the liquid supply pipeline 210 is connected to the liquid storage container 100, so that the liquid in the liquid storage container 100 can be output through the liquid supply pipeline 210, and the other end of the liquid supply pipeline 210 is a liquid supply end and is located at a wellhead of the shaft, so that the liquid can be poured into the shaft through an inlet of the shaft, and the shaft is supplied with the liquid.
The liquid pumping device 300 is a power member for driving the flow of the perfusion liquid, and can generate a driving force to the liquid to make the liquid have a certain pressure and flow along the liquid supply pipeline 210 when in operation. Alternatively, the fluid pumping device 300 may include a pump body. In some embodiments, the liquid pumping device 300 is connected to the liquid supply line 210 to drive the liquid to flow along the liquid supply line 210.
The return line 220 is another tube for conveying the perfusion liquid. The liquid return line 220 may also be a pipe capable of bearing a certain pressure. In some embodiments, one end of the liquid return line 220 is connected to the liquid supply line 210, and the connection point is located downstream of the liquid pump device 300, and the other end is connected to the liquid supply line 210, and the connection point is located upstream of the liquid pump device 300, so that the liquid in the liquid supply line 210 can flow back to the liquid inlet of the liquid pump device 300 through the liquid return line 220, thereby achieving the internal circulation of the liquid.
Alternatively, a connection point of one end of the liquid return line 220 and the liquid supply line 210 is located in a region between the liquid pump device 300 and the first control valve 410, a connection point of the other end of the liquid return line 220 and the liquid supply line 210 is located between the liquid storage container 100 and the liquid pump device 300, or the other end of the liquid return line 220 is connected to the liquid storage container 100, so that the liquid can be returned upstream of the liquid pump device 300 to realize the internal circulation of the liquid.
In order to control the on/off of the liquid supply line 210, a first control valve 410 is disposed on the liquid supply line 210, and the first control valve 410 can be opened or closed, so as to control the on/off of the liquid supply line 210. Similarly, in order to control the on/off of the liquid return line 220, a second control valve 420 is disposed on the liquid return line 220, and the second control valve 420 can be opened or closed, so as to control the on/off of the liquid return line 220.
In order to detect the liquid pressure at the outlet of the liquid supply pipeline 210, the pressure detecting element 610 is disposed on the liquid supply pipeline 210, and the pressure detecting element 610 is close to the outlet of the liquid supply pipeline 210, so that the liquid pressure at the outlet of the liquid supply pipeline 210 can be detected in real time, and adjustment and control can be conveniently realized.
Alternatively, the pressure detecting element 610 may be a wireless pressure sensor, so that the pressure signal may be transmitted to the control device 500 by wireless transmission.
In the embodiment of the present application, the liquid pump device 300, the first control valve 410, and the pressure detecting element 610 are all disposed on the liquid supply pipeline 210, and the liquid pump device 300, the first control valve 410, and the pressure detecting element 610 are sequentially connected in series in the liquid supply pipeline 210 along the liquid supply direction, so that the on/off of the liquid supply pipeline 210 can be controlled, and the liquid pressure can be detected in real time.
The control device 500 is a control component for receiving signals, processing signals and sending control commands in the automatic liquid supply system. The liquid pump device 300, the first control valve 410, the second control valve 420, and the pressure detection element 610 are all connected to the control device 500. As such, the pressure detecting element 610 can transmit the detected fluid pressure signal to the control device 500 to know the fluid pressure value at the inlet of the wellbore; the control device 500 can control the start and stop of the liquid pump device 300, the opening and closing of the first control valve 410, and the opening and closing of the second control valve 420, so as to realize the automatic adjustment and control of the liquid supply process.
In the embodiment of the present application, the pressure detecting element 610 can detect the liquid pressure at the liquid supply outlet in the liquid supply pipeline 210 in real time, so as to obtain the liquid level in the wellbore through the liquid pressure, and adjust the states of the liquid pump apparatus 300, the first control valve 410, and the second control valve 420 according to the liquid pressure. When the liquid pressure does not meet the liquid supply requirement, the first control valve 410 can be controlled to be opened, the second control valve 420 is controlled to be closed, and the liquid pump device 300 is started to supply liquid into the shaft through the liquid supply pipeline 210; when the liquid pressure reaches the liquid supply requirement, the first control valve 410 can be controlled to be closed, the second control valve 420 can be controlled to be opened, and the liquid pump device 300 can be continuously operated to perform liquid internal circulation, or the liquid pump device 300 can be controlled to be stopped.
Based on the setting, the automatic liquid supply system in the embodiment of the application can realize automatic control of the liquid supply process according to the liquid level condition in the shaft, manual operation control is not needed, and manual participation is reduced, so that the influence on normal liquid supply operation of the shaft and the damage to equipment due to manual misoperation can be relieved, control operation is more convenient and accurate, and efficient and accurate operation of liquid supply operation is ensured.
To achieve the adjustment of the liquid flow rate in the liquid supply line 210, the liquid pump device 300 in the embodiment of the present application may include a liquid pump body 320 and a variable frequency drive 310, wherein the liquid pump body 320 is drivingly connected to the output end of the variable frequency drive 310. Based on this, the frequency of the variable frequency drive 310 can be changed to drive the liquid pump body 320 to realize different rotating speeds, so that the operation mode of the liquid pump body 320 can be adjusted.
Alternatively, the liquid pump body 320 may be a centrifugal pump, and of course, other types of liquid pumps may be used, which is not limited in the embodiment of the present application. The variable frequency drive 310 may be a variable frequency motor, or the like. In addition, the variable frequency driving element 310 and the liquid pump body 320 can be in transmission connection through a transmission element 330, wherein the transmission element 330 can be a coupler.
In the embodiment of the present application, the automatic liquid supply system has a plurality of operating modes, specifically including:
before the liquid supply, preparation work is required. Under the condition that the control device 500 receives a command of waiting for liquid supply, the control device 500 controls the variable frequency driving element 310 to perform low-frequency operation (i.e. low-gear operation) because liquid supply operation is not performed, and at this time, the liquid supply flow rate of the liquid pump body 320 is relatively small; meanwhile, the control device 500 controls the first control valve 410 to be closed and the second control valve 420 to be opened, so as to return the liquid through the liquid return line 220, thereby realizing the internal circulation of the liquid. Here, it should be noted that the internal circulation of the liquid specifically refers to: fluid is not delivered into the wellbore via the fluid supply line 210, but is returned upstream of the fluid pumping device 300 via the fluid return line 220, thereby circulating between the fluid supply line 210, the fluid return line 220, and the fluid pumping device 300.
Based on the above arrangement, before the actual liquid supply, the automatic liquid supply system is started, and the internal circulation of the liquid is performed, so that on one hand, the liquid pump device 300 can be operated in advance, that is, the variable frequency driving element 310 and the liquid pump body 320 in the liquid pump device 300 are preheated, the service lives of the variable frequency driving element 310 and the liquid pump body 320 can be prolonged to a certain extent, and on the other hand, the timeliness of the liquid supply can be improved, so that the liquid supply speed and the liquid supply efficiency can be improved.
Referring to fig. 1 and fig. 2, the specific process is as follows: an operator sends a command of waiting for liquid supply, and when the control device 500 receives the command of waiting for liquid supply, the control device 500 controls the variable frequency driving element 310 to start and make it in a low-frequency running state, and at the same time controls the first control valve 410 to close and the second control valve 420 to open, so that under the driving action of the variable frequency driving element 310, the liquid in the liquid storage container 100 flows into the liquid supply pipeline 210 and flows back to the upstream of the liquid pump device 300 through the liquid return pipeline 220, and the circular flow of the liquid can be realized without stopping.
After a period of internal circulation of the liquid, the liquid supply is started. When the control device 500 receives a liquid supply command, the first control valve 410 is controlled to be opened and the second control valve 420 is controlled to be closed, so that liquid flows to the shaft along the liquid supply pipeline 210, and liquid supply to the shaft is achieved.
During the liquid supply process, the pressure detecting element 610 detects the liquid pressure at the outlet of the liquid supply line 210 in real time. When the pressure at the outlet of the fluid supply line 210 is less than the first predetermined pressure value, it indicates that the fluid level in the wellbore is relatively low and below the reference fluid level, thereby requiring a large amount of fluid to be injected into the wellbore.
Based on this, the control device 500 controls the variable frequency driving element 310 to switch from the low frequency operation state of the internal circulation to the high frequency operation (i.e. high gear operation) state, so as to increase the liquid flow in the liquid supply pipeline 210, and further realize the fast liquid supply through the liquid supply pipeline 210, so as to reduce the liquid supply time and improve the liquid supply efficiency.
As the rapid fluid supply process proceeds, the fluid level in the wellbore rapidly increases, and the control device 500 controls the fluid pump device 300 to change the operation state when the fluid level in the wellbore reaches the reference fluid level. The method specifically comprises the following steps: when the pressure at the outlet of the fluid supply line 210 reaches a first predetermined pressure value, indicating that the fluid level in the wellbore is to reach the reference level, it is desirable to slow the fluid supply rate. Based on this, the control device 500 controls the variable frequency driving element 310 to switch from the high frequency operation state to the low frequency operation state, and at the same time, controls the first control valve 410 to keep the open state continuously, and controls the second control valve 420 to keep the closed state continuously, so that the liquid flow in the liquid supply pipeline 210 can be reduced, and further slow liquid supply can be realized through the liquid supply pipeline 210, so as to ensure that the rising speed of the liquid level in the shaft is not too fast.
As the slow fluid supply process progresses, the fluid level in the wellbore slowly increases, and the control device 500 controls the states of the fluid pump device 300, the first control valve 410, and the second control valve 420 when the fluid level in the wellbore reaches the warning level. The method specifically comprises the following steps: when the liquid pressure at the outlet of the liquid supply pipeline 210 exceeds a second preset pressure value, wherein the second preset pressure value is greater than the first preset pressure value, the liquid level in the surface shaft reaches the warning liquid level, and at this time, the liquid supply needs to be stopped as soon as possible to prevent the liquid in the shaft from being excessive. Based on this, the control device 500 controls the first control valve 410 to switch from the open state to the closed state, and the second control valve 420 to switch from the closed state to the open state, and at the same time, controls the variable frequency driving element 310 to continue to maintain the low frequency operation state, so that the liquid in the liquid supply pipeline 210 flows back to the upstream of the liquid pump body 320 along the liquid return pipeline 220, so as to flow back the liquid through the liquid return pipeline 220, thereby realizing the internal circulation of the liquid. At this point, fluid no longer flows along the fluid supply line 210 to the wellbore, thereby stopping the fluid from filling the wellbore to prevent excess fluid from within the wellbore. In addition, in the above process, the control device 500 can also control the alarm to send out alarm information to indicate that the liquid level is at the warning level. Wherein, the alarm information can adopt a mode of combining sound and light.
Along with the internal circulation of the liquid, when the time of the internal circulation reaches a first preset time, the control device 500 controls the variable frequency driving element 310 to stop, and thus, a working cycle is completed. When the next working cycle is needed, the liquid supply waiting instruction is input again so as to repeat the processes of waiting for liquid supply and starting liquid supply. The first preset time may be 30s, 60s, 90s, etc.
Considering the specifics of wellbore operations, in some embodiments, the first predetermined pressure value may be selected to be 100Kpa, when indicating that the fluid level is at a reference level; the second predetermined pressure value may be selected to be 110Kpa, which indicates that the liquid level is at a warning level, which in the embodiment of the present application is 1 meter above the reference level.
Based on the above arrangement, the automatic liquid supply system in the embodiment of the present application may determine the liquid level condition in the shaft according to the liquid pressure at the inlet of the shaft (i.e., the outlet of the liquid supply pipeline 210), and then adjust the liquid supply speed and switch the liquid supply state and the internal circulation state according to different liquid level conditions, thereby implementing the liquid supply operation on the shaft.
In order to detect the volume of the liquid poured into the shaft, the automatic liquid supply system in the embodiment of the present application further includes a flow rate detecting element 620, and the flow rate detecting element 620 is disposed in the liquid supply line 210 and connected to the control device 500. Based on this, the flow rate of the liquid in the liquid supply line 210 per unit time can be detected by the flow rate detection element 620, and the detection result is transmitted to the control device 500, based on which the flow rate of the liquid in the liquid supply line 210 in the second preset time can be calculated, so that the volume of the liquid poured into the wellbore in the second preset time, that is, the volume of the poured liquid can be obtained. The second preset time may be 300s, 600s, 900s, etc.
Alternatively, the flow sensing element 620 may be a flow sensor.
It should be noted here that during the process of pouring the liquid, the oil pipe 810 needs to be drawn out first to provide a space for the pouring liquid. In order to determine the volume of liquid to be filled in the wellbore, the automatic liquid supply system in the embodiment of the present application further includes an identification element 630, the identification element 630 is used for identifying information of a tubing in the wellbore, and the identification element 630 is connected to the control device 500. Wherein the tubing information includes the number of the tubing 810 and the specification parameters of the tubing 810.
Alternatively, the identification element 630 may include an information identification module and a counting module, and both the information identification module and the counting module are connected with the control device 500. The information identification module can identify the specification parameters of the oil pipes 810, and the counting module can count the number of the oil pipes 810. Based on this, the information identification module can transmit the specification parameter information of the oil pipe 810 to the control device 500, the counting module can transmit the quantity information of the oil pipe 810 to the control device 500, and after being processed by the control device 500, the information processing can be performed to obtain the volume of the liquid to be poured.
Referring to fig. 1 and 3, specifically: when the specification parameters of the oil pipe 810 are identified, the cross-sectional area of the oil pipe 810 and the length of the oil pipe 810 can be known, so that the volume of a single oil pipe 810 can be known, and according to the number of the extracted oil pipes 810, the total volume of the extracted oil pipes 810, namely, the volume of the liquid to be poured can be known.
Based on the above arrangement, the control device 500 may compare the resulting volume of liquid to be perfused with the volume of perfused liquid to determine the difference therebetween. When the difference between the volume of the liquid to be filled and the volume of the filled liquid is larger and exceeds a preset deviation value, leakage occurs under the shaft, and at the moment, the liquid supply needs to be stopped emergently. In this way, the control device 500 controls the first control valve 410 to be closed and the second control valve 420 to be opened, so that the liquid in the liquid supply line 210 is returned to the upstream of the liquid pump device 300 through the liquid return line 220, thereby realizing the internal circulation of the liquid. Therefore, when leakage occurs under the shaft, the liquid supply to the shaft is stopped, and corresponding measures are taken to solve the problem of leakage under the shaft.
It should be noted here that when the leakage occurs before the pressure at the outlet of the liquid supply line 210 does not reach the first preset value, the variable frequency driving member 310 is in the high frequency operation state. In order to reduce the flow rate of the backflow liquid in the internal circulation process, the control device 500 can control the variable frequency driving element 310 to be switched from the high-frequency operation state to the low-frequency operation state, so as to reduce the liquid flow rate and ensure the small-flow internal circulation.
When the pressure at the outlet of the liquid supply line 210 exceeds the first preset value and does not reach the second preset value, the variable frequency driving member 310 is in a low frequency operation state. At this time, the control device 500 can control the variable frequency driving element 310 to keep the low frequency operation state, thereby ensuring the small flow internal circulation.
Along with the proceeding of the internal circulation of the liquid, when the time of the internal circulation reaches a first preset time, the control device 500 controls the variable frequency driving piece 310 to stop the machine, the liquid supply to the shaft is stopped, and corresponding measures are taken to solve the problem of leakage under the shaft. The first preset time may be 30s, 60s, 90s, etc.
Based on the setting, whether liquid leakage occurs under the shaft can be determined by comparing the difference between the volume of the liquid to be filled and the volume of the filled liquid with the preset deviation value, and when the liquid leakage occurs, the liquid supply can be stopped emergently, so that more liquid is prevented from leaking under the shaft effectively.
To ensure stability of the flow of liquid in the liquid supply line 210, the automatic liquid supply system may further include a pulsation damper 700, the pulsation damper 700 being connected in the liquid supply line 210 between the liquid pumping device 300 and the first control valve 410. Based on this, the liquid pressure in the liquid supply line 210 can be stabilized by the pulsation damper 700 to ensure a stable flow of the liquid in the liquid supply line 210.
In order to detect the density of the liquid, the automatic liquid supply system may further include a density detecting element 640, and the density detecting element 640 is disposed in the liquid supply line 210 between the liquid pumping device 300 and the first control valve 410. Based on this, the density of the liquid can be detected by the density detection element 640 so as to meet the liquid supply requirement of the shaft.
Alternatively, the density detecting element 640 may be a density sensor.
To sum up, the automatic liquid supply system in the embodiment of the application can realize the automatic control of the liquid supply process according to the liquid condition in the shaft, thereby needing no manual operation control, reducing manual participation, alleviating the influence on normal liquid supply operation of the shaft and the damage to equipment due to manual misoperation, and ensuring more convenient and accurate control operation and high-efficiency and accurate operation of liquid supply operation.
While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise embodiments described above, which are meant to be illustrative and not restrictive, and that various changes may be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. An automatic fluid supply system for supplying fluid to a wellbore, comprising: a liquid storage container (100), a liquid supply line (210), a liquid return line (220), a liquid pump device (300), a first control valve (410), a second control valve (420), a pressure detection element (610), and a control device (500);
one end of the liquid supply pipeline (210) is connected with the liquid storage container (100), the liquid pump device (300), the first control valve (410) and the pressure detection element (610) are sequentially connected in series with the liquid supply pipeline (210) along a liquid supply direction, and the pressure detection element (610) is close to an outlet of the liquid supply pipeline (210);
one end of the liquid return pipeline (220) is connected to a region of the liquid supply pipeline (210) between the liquid pump device (300) and the first control valve (410), the other end of the liquid return pipeline (220) is connected to a region of the liquid supply pipeline (210) between the liquid storage container (100) and the liquid pump device (300), or the other end of the liquid return pipeline (220) is connected to the liquid storage container (100), and the second control valve (420) is arranged on the liquid return pipeline (220);
the liquid pump device (300), the first control valve (410), the second control valve (420) and the pressure detection element (610) are all connected to the control device (500).
2. The automatic liquid supply system of claim 1, wherein the liquid pumping device (300) includes a liquid pumping body (320) and a variable frequency drive (310);
the liquid pump body (320) is in transmission connection with the output end of the variable-frequency driving piece (310).
3. The automatic liquid supply system as claimed in claim 2, wherein, in case the control device (500) receives a waiting liquid supply command, the control device (500) controls the variable frequency drive (310) to perform a low frequency operation, and controls the first control valve (410) to be closed and the second control valve (420) to be opened for performing an internal circulation of the liquid.
4. The automatic liquid supply system of claim 2, characterized in that, when the control device (500) receives a command for starting liquid supply, and when the liquid pressure at the outlet of the liquid supply pipeline (210) is smaller than a first preset pressure value, the control device (500) controls the variable frequency driving element (310) to perform high-frequency operation, and controls the first control valve (410) to be opened and the second control valve (420) to be closed so as to perform rapid liquid supply through the liquid supply pipeline (210);
when the pressure at the outlet of the liquid supply pipeline (210) reaches the first preset pressure value, the control device (500) controls the variable-frequency driving piece (310) to be switched from high-frequency operation to low-frequency operation, so that slow liquid supply is performed through the liquid supply pipeline (210).
5. The automatic liquid supply system of claim 4, wherein the control device (500) controls the first control valve (410) to close and the second control valve (420) to open for internal circulation of the liquid when the pressure of the liquid at the outlet of the liquid supply line (210) exceeds a second preset pressure value, wherein the second preset pressure value is greater than the first preset pressure value;
when the time of the internal circulation reaches a first preset time, the control device (500) controls the variable-frequency driving piece (310) to stop.
6. The automatic liquid supply system of claim 2, further comprising a flow rate detecting element (620), wherein the flow rate detecting element (620) is disposed on the liquid supply pipeline (210) and connected to the control device (500).
7. The automatic liquid supply system of claim 6, further comprising an identification element (630) for identifying tubing information in the wellbore, the identification element (630) being connected to the control device (500).
8. The automatic liquid supply system of claim 7, wherein the control device (500) is configured to obtain a volume of the liquid to be poured in the wellbore according to the tubing information, obtain a volume of the poured liquid in the wellbore according to the liquid flow rate detected by the flow rate detection element (620) within a second preset time, and compare the volume of the poured liquid with the volume of the liquid to be poured;
when the difference between the volume of the filled liquid and the volume of the liquid to be filled exceeds a preset deviation value, the control device (500) controls the first control valve (410) to be closed and the second control valve (420) to be opened so as to perform internal circulation of the liquid;
when the time of the internal circulation reaches a first preset time, the control device (500) controls the variable-frequency driving piece (310) to stop.
9. The automatic liquid supply system of claim 1, further comprising a pulsation damper (700), the pulsation damper (700) being disposed in the liquid supply line (210) and between the liquid pumping device (300) and the first control valve (410);
and/or the automatic liquid supply system further comprises a density detection element (640), and the density detection element (640) is arranged on the liquid supply pipeline (210) and is positioned between the liquid pump device (300) and the first control valve (410).
10. The automatic liquid supply system of claim 1, wherein the pressure sensing element (610) is a wireless pressure sensor;
or the automatic liquid supply system further comprises a flow detection element (620), and the flow detection element (620) is a flow sensor;
or the automatic liquid supply system further comprises an identification element (630), the identification element (630) comprises an information identification module and a counting module, and the information identification module and the counting module are both connected with the control device (500).
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