CN113426743B - Offshore oilfield liquid level meter cleaning system and method - Google Patents
Offshore oilfield liquid level meter cleaning system and method Download PDFInfo
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- CN113426743B CN113426743B CN202110706623.0A CN202110706623A CN113426743B CN 113426743 B CN113426743 B CN 113426743B CN 202110706623 A CN202110706623 A CN 202110706623A CN 113426743 B CN113426743 B CN 113426743B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/02—Cleaning by the force of jets or sprays
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B13/00—Accessories or details of general applicability for machines or apparatus for cleaning
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/08—Cleaning containers, e.g. tanks
- B08B9/093—Cleaning containers, e.g. tanks by the force of jets or sprays
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/20—Controlling water pollution; Waste water treatment
- Y02A20/204—Keeping clear the surface of open water from oil spills
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- Level Indicators Using A Float (AREA)
Abstract
The invention relates to the technical field of cleaning of a liquid level meter with a magnetic floater, in particular to a cleaning system and a cleaning method for a liquid level meter in an offshore oilfield, wherein the cleaning system for the liquid level meter in the offshore oilfield comprises an oil-water tank, a liquid level meter, a closed discharge tank and a control system, wherein the oil-water tank is respectively provided with a water cavity and an oil cavity; a first valve, a second valve and a fourth valve are respectively arranged between the liquid level meter and the oil-water tank, the first valve and the second valve are both communicated with the oil cavity and the liquid level meter, and the fourth valve is both communicated with the water cavity and the liquid level meter; a third valve which is respectively communicated with the liquid level meter and the closed discharge tank is arranged between the liquid level meter and the closed discharge tank; the control system is respectively electrically connected with the first valve, the second valve, the third valve and the fourth valve. The invention provides a cleaning system for a liquid level meter of an offshore oil field, which can automatically clean the liquid level meter, does not destroy the original oil field components, can greatly utilize the original resources, saves the labor cost, and is very convenient and efficient.
Description
Technical Field
The invention relates to the technical field of liquid level meter cleaning of magnetic floaters, in particular to a system and a method for cleaning a liquid level meter in an offshore oilfield.
Background
A large number of level gauges are used in the oil industry. The types of liquid level meters are various at present, the accuracy grade of each type of liquid level meter is different, and the types of the liquid level meters used under different environmental conditions are also different. Among them, the liquid level meter which reflects the measured liquid level or the interface is most widely used through the coupling effect of the magnetic floater and the magnetic body in the display color bar. The liquid level meter and the measured container form a communicating vessel, and the liquid level between the measured container and the measuring pipe body is ensured to be equal. When the float in the measuring tube of the liquid level meter changes along with the measured liquid level, the magnetic body in the float and the magnetic body in the display color code on the display bar act to turn over the liquid level meter, the red color indicates that liquid exists, and the white color indicates that no liquid exists, so that the aim of accurately displaying the liquid level on site is fulfilled. The problem that automatic control cannot be realized due to failure of a liquid level transmitter for control frequently occurs in the production process. The failure fault of the liquid level transmitter often occurs on the oil cavity liquid level control process with poor oil product, the fault is mostly caused by the blockage of a magnetic floater of the liquid level meter due to poor oil product, high viscosity of crude oil product, high solidification point, scaling and wax deposition, and the current solution is to clean the liquid level meter manually and periodically. The cleaning work of the liquid level meter consumes time and labor, a lot of waste oil and waste water can be generated in the cleaning process, the time is consumed for treatment, the environmental sanitation of the site is also influenced, the manual regular cleaning of the liquid level meter is often caused by the clamping stagnation of the liquid level meter, but the automatic cleaning device for the liquid level meter is necessary to research and develop because the tank overflow accident of the container is caused because the central control and site operators cannot find the liquid level meter in time.
Chinese patent CN 209985904U discloses an automatic cleaning device for acid-base storage tank level gauge, utilize nitrogen gas storage tank and ball valve to make nitrogen gas pass through the washing nozzle along the pipeline and blast the attachment on the level gauge probe, because the scene of using is different, gas such as natural gas just exists originally in the oil field level gauge, if utilize gas to wash the oil field level gauge, can lead to mixing other miscellaneous gas in the oil gas on the one hand, the process of subsequent gas separation has been increased on foot, cause inconvenience and increase cost, on the other hand, utilize gaseous washing in the oil field level gauge, also can increase the potential safety hazard, after all, oil belongs to flammable explosive article. In the prior art, the offshore oil field liquid level meter is cleaned manually, and an automatic liquid level meter cleaning system is not provided.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a cleaning system for a liquid level meter of an offshore oil field, which can automatically clean the liquid level cleaning meter, does not destroy the original oil field components, can greatly utilize the original resources, saves the labor cost, is very convenient and efficient and has no pollution.
In order to solve the technical problems, the invention adopts the technical scheme that:
the cleaning system comprises an oil-water gas tank, a liquid level meter, a closed discharge tank and a control system, wherein the oil-water gas tank is provided with a water cavity and an oil cavity respectively; a first valve, a second valve and a fourth valve are respectively arranged between the liquid level meter and the oil-water gas tank, the first valve and the second valve are both communicated with the oil cavity and the liquid level meter, the first valve is arranged at the upper part of the oil cavity, the second valve is arranged at the lower part of the oil cavity, and the fourth valve is communicated with the water cavity and the liquid level meter; a third valve is arranged between the liquid level meter and the closed drainage tank, the third valve is respectively communicated with the liquid level meter and the closed drainage tank, and water can flow through the liquid level meter from the water cavity and then enter the closed drainage tank; the control system is electrically connected with the first valve, the second valve, the third valve and the fourth valve respectively.
The cleaning system of the liquid level meter is used for cleaning the magnetic floater in the liquid level meter so as to solve the problem that the liquid level meter cannot display accurate oil quantity due to clamping stagnation caused by the oil quality problem in the use process of the magnetic floater in the liquid level meter; the oil-water tank is used as a storage for oil-water-gas three-phase separation, can be used for providing cleaning water for the liquid level meter in the cleaning process, and can detect whether the liquid level meter is normal or not by displaying the oil quantity by the liquid level meter after the liquid level meter is cleaned; under the action of gravity, free water sinks to the bottom of the container due to the density difference of oil and water, oil floats to the upper surface, water is stored in the water cavity, and oil is stored in the oil cavity; the liquid level meter is used for indicating the liquid level of an oil cavity in the oil-water gas tank, and the numerical value of the liquid level meter is changed constantly under normal conditions because oil-water-gas treatment is always carried out; the first valve arranged at the upper part of the oil cavity and the second valve arranged at the lower part of the oil cavity enable a communicating vessel to be formed between the oil cavity and the liquid level meter, so that the liquid level meter can eliminate the influence of air pressure and accurately indicate the liquid level of the oil cavity; the water cavity can be communicated with the liquid level meter through the third valve, so that an external water source is not needed in the cleaning process of the liquid level meter, water in the water cavity is directly used for cleaning, and the purpose of saving resources can be achieved; the liquid level meter can be communicated with the closed discharge tank through the fourth valve, and in the cleaning process of the liquid level meter, the cleaned wastewater can enter the closed discharge tank for temporary storage, so that the environmental pollution is prevented; the control system is used for respectively regulating and controlling the first valve, the second valve, the third valve and the fourth valve to complete the automatic cleaning process of the whole liquid level meter, and the clean waste water in the cleaning process of the whole liquid level meter is stored in the closed discharge tank, so that the pollution to the environment can not be caused.
Preferably, the control system includes an acquisition module for acquiring liquid level information, a conversion module for converting the liquid level information into digital information, a detection module for detecting whether the liquid level meter and the valve are abnormal, a PLC controller for controlling the valve according to a detection result, and a power module, wherein the conversion module is respectively connected with the acquisition module and the detection module electrically, the PLC controller is connected with the detection module electrically, and the power module is connected with the PLC controller and the acquisition module and the conversion module and the detection module electrically.
Preferably, a partition plate used for separating the water cavity from the oil cavity is arranged in the oil-water gas tank, the bottom of the partition plate is connected with the oil-water gas tank, and a gap is reserved between the top of the partition plate and the top of the oil-water gas tank.
Preferably, the liquid level gauge further comprises a first manual discharge valve and a second manual discharge valve, wherein the first manual discharge valve is communicated with the top of the liquid level gauge, and the second manual discharge valve is communicated with the bottom of the liquid level gauge.
The invention also provides a cleaning method of the offshore oilfield liquid level meter, which comprises the following steps:
s1: the first valve (51) and the second valve (52) communicated with the oil cavity (12) are closed, so that the situation that oil enters the liquid level meter to obstruct the cleaning process of the liquid level meter is avoided;
s2: a third valve (53) communicated with the liquid level meter (2) and the closed discharge tank (3) is opened so as to facilitate the cleaned waste liquid to flow into the closed discharge tank (3) for temporary storage;
s3: a fourth valve (54) which is communicated with the water cavity (11) and used for opening the liquid level meter (2) enables water to enter the liquid level meter so as to be convenient for cleaning the liquid level meter;
s4: the magnetic floater (21) is continuously washed by water flow to clean the liquid level meter (2);
s5: closing the fourth valve (54) and stopping the cleaning of the magnetic float (21);
s6: opening a second valve (52) to allow oil to enter the gauge;
s7: after the water in the liquid level meter is discharged, a third valve (53) is closed, and oil is prevented from flowing into the closed discharge tank;
s8: opening a first valve (51) to form a communicating vessel between the oil chamber and the liquid level meter;
s9: detecting whether the liquid level meter (2) is cleaned or not by observing whether the numerical value of the liquid level meter changes or not, and finishing the process if the cleaning is finished; if the cleaning is not completed, the process returns to step S1.
Further, the cleaning time of the liquid level meter in the step S4 is 15S to 20S; the step S7 is separated from the step S8 by at least 3S.
Further, a pre-step of detecting the liquid level meter to determine whether it needs cleaning is included before the step S1.
Further, the specific steps of judging whether the liquid level meter needs to be cleaned are as follows:
sa: the acquisition module acquires liquid level information of the liquid level meter and transmits the liquid level information to the conversion module;
sb: the conversion module converts the liquid level information into a liquid level value of the liquid level meter and then transmits the liquid level value to the detection module;
and (C) Sc: the detection module compares the liquid level values, if the liquid level values in 30s are kept unchanged, the liquid level meter is abnormal and needs to be cleaned, and meanwhile, an alarm system is started to give an alarm; if the liquid level value within 30s is changed, the liquid level meter is normal and does not need to be cleaned.
Furthermore, the detection system monitors the first valve, the second valve, the third valve and the fourth valve respectively, and if a valve fault occurs, the alarm system is started to send an alarm.
Further, before the step S1, a mode selection step is further included: if the automatic cleaning mode is selected, the process proceeds to step S1, and if the manual cleaning mode is selected, the first manual drain valve and the second manual drain valve are opened to clean the liquid level gauge.
Compared with the prior art, the invention has the beneficial effects that:
(1) the liquid level meter can be automatically cleaned, so that the labor cost is saved;
(2) the abnormal liquid level control can be found and solved in time, and the treatment effect of oil-water-gas separation of the three-phase separator is guaranteed;
(3) each valve can be monitored in real time in the process of automatically cleaning the liquid level meter, so that the oil and water are prevented from being mixed in a large amount due to the failure of the valve, and the problem that a large amount of liquid is discharged to a closed discharge tank is solved;
(4) the original separated water can be utilized to clean the liquid level meter, the step of an external water source can be omitted, and simultaneously, the resources can be saved.
Drawings
FIG. 1 is a schematic diagram of a cleaning system for an offshore oilfield level gauge of the present invention;
FIG. 2 is a block diagram of a control system;
FIG. 3 is a flow chart of a method of cleaning an offshore oilfield level gauge of the present invention.
The graphic symbols are illustrated as follows:
1. an oil-water tank; 11. a water chamber; 12. an oil chamber; 13. a partition plate; 2. a liquid level meter; 21. a magnetic float; 3. Closing the discharge tank; 4. a control system; 51. a first valve; 52. a second valve; 53. a third valve; 54. a fourth valve; 55. a first manual bleed valve; 56. a second manual bleed valve.
Detailed Description
The present invention will be further described with reference to the following embodiments. Wherein the showings are for the purpose of illustration only and are shown by way of illustration only and not in actual form, and are not to be construed as limiting the present patent; for a better explanation of the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Example 1
Fig. 1 to 2 show an embodiment of a cleaning system for a liquid level meter in an offshore oilfield according to the present invention, which includes an oil-water tank 1 having a water chamber 11 and an oil chamber 12, a liquid level meter 2 having a magnetic float 21 therein, a closed discharge tank 3 for storing cleaning waste liquid, and a control system 4; a first valve 51, a second valve 52 and a fourth valve 54 are respectively arranged between the liquid level meter 2 and the oil-water tank 1, the first valve 51 and the second valve 52 are both communicated with the oil cavity 12 and the liquid level meter 2, the first valve 51 is arranged at the upper part of the oil cavity 12, the second valve 52 is arranged at the lower part of the oil cavity 12, and the fourth valve 54 is communicated with the water cavity 11 and the liquid level meter 2; a third valve 53 is arranged between the liquid level meter 2 and the closed exhaust tank 3, the third valve 53 is respectively communicated with the liquid level meter 2 and the closed exhaust tank 3, and water can flow through the liquid level meter 2 from the water cavity 11 and then enter the closed exhaust tank 3; the control system 4 is electrically connected to the first valve 51, the second valve 52, the third valve 53, and the fourth valve 54, respectively.
The liquid level detection device comprises an acquisition module for acquiring liquid level information, a conversion module for converting the liquid level information into digital information, a detection module for detecting whether a liquid level meter and a valve are abnormal or not, a PLC (programmable logic controller) for controlling the valve according to a detection result and a power supply module, wherein the conversion module is respectively electrically connected with the acquisition module and the detection module, the PLC is electrically connected with the detection module, and the power supply module is electrically connected with the PLC, the acquisition module, the conversion module and the detection module.
The acquisition module is used for acquiring liquid level information and then transmitting the liquid level information to the conversion module, and preferably, the acquisition module is a magnetostrictive liquid level transmitter; the conversion module is used for performing liquid level digital-to-analog conversion and converting analog quantity into digital quantity; specifically, the conversion module comprises an analog input module, a digital output module, a digital input module and an upper computer, wherein the analog input module is electrically connected with the acquisition module, liquid level information acquired by the acquisition module is transmitted to the analog input module, the analog input module transmits the information to the analog output module, the conversion is carried out through the digital beam input module, and finally the digital output is carried out through the upper computer. The detection module is used for detecting the output of the level value of the liquid level meter 2 by the conversion module to judge whether the liquid level meter 2 is abnormal, and meanwhile, the detection module can also monitor whether the valves are in fault or not for the first valve 51, the second valve 52, the third valve 53 and the fourth valve 54 respectively; the PLC carries out analysis processing according to the detection result of the detection module to determine whether to execute a cleaning program of the liquid level meter 2 or not according to the state of the control valve; the power module supplies power to each module.
In one embodiment of the present invention, a partition plate 13 for separating the water chamber 11 from the oil chamber 12 is provided in the oil/water tank, the bottom of the partition plate 13 is connected to the oil/water tank, and a gap is provided between the top of the partition plate 13 and the top of the oil/water tank.
As an embodiment of the invention, the oil-water gas tank 1 is provided with an inlet for supplying oil-water-gas mixture, a flow divider is arranged at the inlet, a coalescence plate, a foam breaker and a demister are sequentially arranged in the process of flowing the oil-water-gas mixture, a water phase outlet is arranged in the water cavity 11, and a drain valve is communicated with the outside of the water phase outlet; the oil cavity 12 is provided with an oil phase outlet which is externally communicated with an oil discharge valve; the top of the oil-water gas tank 1 is also provided with a gas outlet, and the gas outlet is communicated with an exhaust valve; the oil drainage system also comprises a regulation and control center for controlling air exhaust, oil drainage and water drainage, wherein the regulation and control center is respectively in communication connection with the oil drainage valve, the exhaust valve and the water drainage valve.
The oil-water gas tank 1 is used as a three-phase separator, when formation fluid, namely an oil-water-gas mixture, enters the three-phase separator, firstly meets an inlet flow divider, so that liquid and gas are primarily separated, the gas carrying a large amount of liquid drops is further separated by a coalescence plate, and then passes through a defoamer and a demister to be further purified, so that the gas becomes dry gas and is discharged from a gas outlet. The vent valve is used to control the amount of gas venting to maintain the desired pressure within the container. Under the action of gravity, due to the density difference of oil and water, free water sinks to the bottom of the container, oil floats to the upper side and enters the oil cavity 12 by crossing the partition plate 13, the liquid level meter 2 can display the oil quantity and feed the oil quantity back to a regulation center, and then the discharge amount of crude oil is controlled by operating an oil discharge valve so as to keep the stability of the oil level. The separated free water is discharged through a drain valve to keep the oil-water interface stable. The liquid level control plays a key role in the oil-gas-water treatment process of the three-phase separator, can play a role in warning and preventing except playing a role in control, and can shut down the system at a liquid level low point and a liquid level high point firstly to guarantee safe production.
The liquid level meter further comprises a first manual drain valve 55 and a second manual drain valve 56, wherein the first manual drain valve 55 is communicated with the top of the liquid level meter 2, and the second manual drain valve 56 is communicated with the bottom of the liquid level meter 2.
The first manual drain valve 55 is used to control the supply of water to the level gauge 2 when the level gauge 2 is manually cleaned, and the second manual drain valve 56 is used to control the discharge of sewage from the level gauge 2 after the level gauge 2 is manually cleaned.
In one embodiment of the present invention, an alarm system is further included for giving an alarm when the first valve 51, the second valve 52, the third valve 53, and the fourth valve 54 fail, and the alarm system is communicatively connected to the detection module.
The warning system realizes the warning function so as to prevent the cleaning work of the whole liquid level meter 2 from being influenced by the fault of the valve, can carry out the warning work in a plurality of modes, can light the warning lamp when the warning occurs so that the working personnel can find the fault condition of the valve in time, can also carry out the warning with sound, and can send out the buzzing sound to remind the working personnel when the valve fault occurs; the alarm system can be connected with the cloud platform, and once a valve fault occurs, the fault condition is timely sent to mobile phones of all team responsible personnel through the cloud platform by short messages.
Example 2
Fig. 3 shows an embodiment of the method for cleaning the offshore oilfield level gauge according to the present invention, which comprises the following steps:
the liquid level meter 2 is detected to judge whether the liquid level meter needs cleaning or not, and the method comprises the following specific steps:
sa: the acquisition module acquires liquid level information of the liquid level meter 2 and transmits the liquid level information to the conversion module;
the acquisition module is a magnetostrictive liquid level transmitter; the liquid level transmitter is used for accurately measuring and transmitting the volume, the liquid height and the weight of the oil.
Sb: the conversion module converts the liquid level information into a liquid level value of the liquid level meter 2, and then transmits the liquid level value to the detection module;
and (C) Sc: the detection module compares the liquid level values, if the liquid level values in 30s are kept unchanged, the liquid level meter 2 is abnormal and needs to be cleaned, and meanwhile, an alarm system is started to give an alarm; if the level value of 30s is changed, it indicates that the liquid level gauge 2 is normal and cleaning is not required.
Sd: and (3) carrying out mode selection: if the automatic cleaning mode is selected, the process proceeds to step S1, and if the manual cleaning mode is selected, the first manual drain valve 55 and the second manual drain valve 56 are opened to clean the liquid level gauge 2.
The manual cleaning mode is added on the basis of the automatic cleaning mode, and the manual mode can be selected to clean the liquid level meter 2 when the automatic cleaning mode breaks down or the liquid level meter 2 needs to be cleaned by an external water receiving source; the manual washing mode is a supplement to the automatic washing mode, and mainly the automatic washing mode.
S1: the first valve 51 and the second valve 52 which are communicated with the oil chamber 12 are closed, so that the oil is prevented from entering the liquid level meter to obstruct the cleaning process of the liquid level meter;
s2: a third valve 53 for communicating the liquid level meter 2 with the closed drainage tank 3 is opened so as to facilitate the cleaned waste liquid to flow into the closed drainage tank 3 for temporary storage;
s3: a fourth valve 54 of the liquid level meter 2 communicated with the water cavity 11 is opened, so that water enters the liquid level meter to facilitate cleaning of the liquid level meter;
s4: the magnetic floater 21 is continuously washed by water flow to clean the liquid level meter 2;
after the water cavity 11 is communicated with the liquid level meter 2, the liquid level meter 2 is washed by using hot water with the pressure of 30Kpa in the water cavity 11, and the cleaning time of the liquid level meter 2 is 15-20 s; here, the cleaning time period of the liquid level meter 2 can be adjusted to meet the demand by setting the system.
S5: closing the fourth valve 54 and stopping the cleaning of the magnetic float 21;
s6: opening the second valve 52 to allow oil to enter the gauge;
s7: after the water in the liquid level meter is discharged, the third valve 53 is closed, and the oil is prevented from flowing into the closed discharge tank;
delaying for at least 3s and then carrying out the next operation; the delayed closing of the third valve 53 can enable the cleaning wastewater in the liquid level meter 2 to be discharged into the closed discharge tank 3 as much as possible, and reduce the influence on the oil quality caused by the mixing of the wastewater and the oil in the oil cavity 12. And a closed discharge pump is arranged outside the closed discharge tank, and the closed discharge pump has a liquid level control function. If the number of the self-cleaning liquid level meters 2 is large, the amount of the discharged oil-water mixture in the closed discharge tank is large.
S8: opening a first valve (51) to form a communicating vessel between the oil chamber and the liquid level meter, so that the liquid level meter can display the oil quantity;
s9: detecting whether the liquid level meter (2) is cleaned or not by observing whether the numerical value of the liquid level meter changes or not, and finishing the process if the cleaning is finished; if the cleaning is not completed, the process returns to step S1.
The detection system monitors the first valve 51, the second valve 52, the third valve 53 and the fourth valve 54 respectively, and if a valve fault occurs, the alarm system is started to give an alarm.
And the program needs to judge whether to continue executing the program according to the valve in-place state, and if any valve does not act in place within 3 seconds after receiving the opening or closing action instruction, a corresponding valve fault alarm signal is sent to the control room to remind monitoring operators to pay attention to the self-cleaning process fault and need to check and confirm on site. The valve is closed in place, which is a key condition for ensuring the normal use of the process, and if the valve is not closed in place, the problem of oil-water communication can be caused, and the problem that a large amount of oil-water is not discharged to a closed discharge tank can also be caused.
Preferably, the first valve 51, the second valve 52, the third valve 53 and the fourth valve 54 are all remote-controlled inventions, each valve is provided with an initial position, the first valve 51 and the second valve 52 are opened initially, and the third valve 53 and the fourth valve 54 are closed initially. When any valve fault alarms in the self-cleaning program execution process, the program stops running. The program stops all valves from being placed in the closed position, and after the confirmation of monitoring personnel, all valves can be reset to be placed in the initial position. When the valve is in failure, all the valves are forcibly closed, and meanwhile, the confirmation reset function is added to prevent the oil phase from being communicated with the water and prevent a large amount of liquid from being discharged to the closed discharge tank.
The auto-clean process begins by shutting down the associated bypass associated with the level transmitter. The bypass comprises switching the liquid level control circuit to manual control; and turning off the liquid level transmitter in a high-high and low-low mode. Normally the oil chamber 12 is equipped with two level transmitters, one for control and the other for shutdown protection, which serve as reference references for monitoring.
When a self-cleaning program starts in an automatic mode, an alarm signal is sent out to remind a monitoring operator of starting self-cleaning in the automatic mode, and after the self-cleaning process is finished, the monitoring operator can restore a relevant bypass of the liquid level transmitter on the process influence by clicking confirmation on an upper computer. When the liquid level meter 2 is self-cleaned, the control function and the shutdown protection function of the liquid level meter 2 are bypassed, the remote manual control needs to be focused and executed, therefore, the alarm reminding needs to be carried out, after the self-cleaning is finished, the liquid level meter 2 needs to be stabilized for a period of unfixed time, and the manual confirmation is set, so that the stability of the production process is guaranteed.
The cleaning method of the offshore oilfield liquid level meter 2 can facilitate the cleaning of the liquid level meter 2, improve the automation level and reduce a large amount of labor cost. Meanwhile, the abnormal liquid level control can be found and solved in time, and the separation treatment effect of the three-phase separator is guaranteed.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. This need not be, nor should it be exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (9)
1. A cleaning system for a liquid level meter in an offshore oilfield is characterized by comprising an oil-water gas tank (1) which is respectively provided with a water cavity (11) and an oil cavity (12), a liquid level meter (2) which is internally provided with a magnetic floater (21), a closed discharge tank (3) for storing cleaning waste liquid and a control system (4); a first valve (51), a second valve (52) and a fourth valve (54) are respectively arranged between the liquid level meter (2) and the oil-water gas tank (1), the first valve (51) and the second valve (52) are communicated with the oil cavity (12) and the liquid level meter (2), the first valve (51) is arranged at the upper part of the oil cavity (12), the second valve (52) is arranged at the lower part of the oil cavity (12), and the fourth valve (54) is communicated with the water cavity (11) and the liquid level meter (2); a third valve (53) is arranged between the liquid level meter (2) and the closed drainage tank (3), the third valve (53) is respectively communicated with the liquid level meter (2) and the closed drainage tank (3), and water can flow through the liquid level meter (2) from the water cavity (11) and then enter the closed drainage tank (3); the control system (4) is electrically connected with the first valve (51), the second valve (52), the third valve (53) and the fourth valve (54) respectively; the liquid level meter is characterized by further comprising a first manual release valve (55) and a second manual release valve (56), wherein the first manual release valve (55) is communicated with the top of the liquid level meter (2), and the second manual release valve (56) is communicated with the bottom of the liquid level meter (2).
2. The offshore oilfield level gauge cleaning system defined by claim 1, wherein the control system (4) comprises an acquisition module for acquiring level information, a conversion module for converting the level information into digital information, a detection module for detecting whether the level gauge and the valve are abnormal, a PLC controller for controlling the valve according to the detection result, and a power module, wherein the conversion module is electrically connected with the acquisition module and the detection module respectively, the PLC controller is electrically connected with the detection module, and the power module is electrically connected with the PLC controller, the acquisition module, the conversion module and the detection module.
3. Offshore oilfield level gauge cleaning system according to claim 1 or 2, wherein a partition plate (13) is arranged in the oil and water tank for separating the water chamber (11) from the oil chamber (12), wherein the bottom of the partition plate (13) is connected with the oil and water tank, and a gap is left between the top of the partition plate (13) and the top of the oil and water tank.
4. A method for cleaning an offshore oilfield level gauge, applied to the offshore oilfield level gauge cleaning system of any one of claims 1 to 3, comprising the steps of:
s1: the first valve (51) and the second valve (52) which are communicated with the oil chamber (12) are closed, so that the oil is prevented from entering the liquid level meter to hinder the cleaning process of the liquid level meter;
s2: a third valve (53) which is communicated with the liquid level meter (2) and the closed discharge tank (3) is opened so as to facilitate the cleaned waste liquid to flow into the closed discharge tank (3) for temporary storage;
s3: a fourth valve (54) which is communicated with the water cavity (11) and used for opening the liquid level meter (2) enables water to enter the liquid level meter so as to be convenient for cleaning the liquid level meter;
s4: the magnetic floater (21) is continuously washed by water flow to clean the liquid level meter (2);
s5: closing the fourth valve (54) and stopping the cleaning of the magnetic float (21);
s6: opening a second valve (52) to allow oil to enter the gauge;
s7: after the water in the liquid level meter is discharged, the third valve (53) is closed, and the oil is prevented from flowing into the closed discharge tank;
s8: opening a first valve (51) to form a communicating vessel between the oil chamber and the liquid level meter, so that the liquid level meter can display the oil quantity;
s9: detecting whether the liquid level meter (2) is cleaned or not by observing whether the numerical value of the liquid level meter changes or not, and finishing the process if the cleaning is finished; if the cleaning is not completed, the process returns to step S1.
5. Method for cleaning offshore oilfield level gauge according to claim 4, wherein the cleaning time of the level gauge (2) in step S4 is 15S to 20S; the step S7 is separated from the step S8 by at least 3S.
6. Method for cleaning offshore oilfield level gauge according to claim 5, further comprising a pre-step of testing the level gauge (2) to determine whether it needs cleaning before step S1.
7. Method for cleaning offshore oilfield level gauge according to claim 6, wherein the specific steps of determining whether the level gauge (2) needs to be cleaned are as follows:
sa: the acquisition module acquires liquid level information of the liquid level meter (2) and transmits the liquid level information to the conversion module;
sb: the conversion module converts the liquid level information into a liquid level value of the liquid level meter (2), and then transmits the liquid level value to the detection module;
and (C) Sc: the detection module compares the liquid level values, if the liquid level values in 30s are kept unchanged, the liquid level meter (2) is abnormal and needs to be cleaned, and meanwhile, an alarm system is started to give an alarm; if the liquid level value within 30s is changed, the liquid level meter (2) is normal and does not need to be cleaned.
8. Method for cleaning offshore oilfield level gauge according to any of the claims 4-7, wherein the detection module monitors the first valve (51), the second valve (52), the third valve (53) and the fourth valve (54), respectively, and if a valve failure occurs, an alarm system is activated to give an alarm.
9. The method of cleaning offshore oilfield level gauge of claim 8, further comprising a mode selection step before the step S1: if the automatic cleaning mode is selected, the flow proceeds to step S1, and if the manual cleaning mode is selected, the first manual drain valve (55) and the second manual drain valve (56) are opened to clean the liquid level gauge (2).
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| JP2008155140A (en) * | 2006-12-25 | 2008-07-10 | Nidec Sankyo Corp | Tube cleaning device, liquid level gage, flowmeter, and float type flowmeter |
| CN202527422U (en) * | 2012-04-27 | 2012-11-14 | 聊城市鲁西化工工程设计有限责任公司 | Tetrachloroethylene quench tower liquid level meter cleaning device |
| CN203116815U (en) * | 2013-02-04 | 2013-08-07 | 中国海洋石油总公司 | Liquid level meter |
| CN105756655A (en) * | 2014-12-17 | 2016-07-13 | 中国石油天然气股份有限公司 | Separator system and cleaning method applied to same |
| CN107303575A (en) * | 2016-04-18 | 2017-10-31 | 中国石油天然气股份有限公司 | Liquid level gauge flusher and crude oil gathering system |
| CN207816413U (en) * | 2017-12-25 | 2018-09-04 | 华润电力（常熟）有限公司 | A kind of magnetic double level gauge of flushable float |
| CN210293382U (en) * | 2019-10-10 | 2020-04-10 | 陈秋鸿 | Novel easily wash easy card formula level gauge of separating |
| CN112698670A (en) * | 2020-12-30 | 2021-04-23 | 森诺技术有限公司 | Device for controlling oil-water interface of split equipment |
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