CN103850921A - Well control protection device and method for electric submersible pump - Google Patents
Well control protection device and method for electric submersible pump Download PDFInfo
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- CN103850921A CN103850921A CN201410054165.7A CN201410054165A CN103850921A CN 103850921 A CN103850921 A CN 103850921A CN 201410054165 A CN201410054165 A CN 201410054165A CN 103850921 A CN103850921 A CN 103850921A
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- submersible pump
- electric submersible
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Abstract
The invention discloses a well control protection device and method for an electric submersible pump. The electric submersible pump is arranged in an oil well. The well control protection device comprises a working fluid level monitoring device, an underground temperature monitoring device and an automatic watering device, wherein the working fluid level monitoring device is arranged at the wellhead of the oil well, and is used for monitoring and acquiring the working fluid level data of the oil well and transmitting to the automatic watering device; the underground temperature monitoring device is arranged on a pump head of the electric submersible pump, is used for monitoring and acquiring the temperature value of an electric submersible pump motor and transmitting to the automatic watering device; the automatic watering device is connected with the working fluid level monitoring device and the underground temperature monitoring device, and is used for generating a warning signal according to the working fluid level data or the temperature value of the motor and watering the loop space of the oil well according to the warning signal.
Description
Technical field
The present invention relates to field of petroleum exploitation, kill-job protective gear and the method for a kind of electric submersible pump of special design.
Background technique
Along with oil extraction cost is more and more higher, viscous crude is increasing at the proportion of world and China crude oil production.SAGD (SAGD) technology enters scale application at home and abroad, and main heavy oil block has been obtained extensive success in the world.At present SAGD lifting technology is take rod pump as main, and sucker rod pump reliability is low, surface technology complexity, and maintenance workload is large, and due to the restriction such as underground bushing and processing technology, and big pump diameter is Φ 140mm at present, at 3min
-1in situation, can only meet 531m
3/ d Theoretical flowing capacity, for SAGD oil well, tubular type pump delivery cannot meet the production requirement of high-yield well.The trend of electric submersible pump is to large discharge capacity, high-power, high reliability, high temperature resistant, high pressure resistant future development, to automation, intellectuality and telemonitoring future development, to improve Applicable scope and the life-span of electric submersible pump, and significantly reduces costs.Along with the development of electric submersible pumping technology, the raising of operation stability under SAGD well hot environment, utilizes electric submersible pump exploitation SAGD oil well, and increasing SAGD oil well discharge opeing and realizing mid-deep strata exploitation becomes effective technological means.
For the development of following SAGD Lifting Technique, tubing pump must solve for the restriction of high-yield well, the high temperature electric submersible pump that at present external SAGD adopts has been obtained good effect at the scene, and electric submersible pump can solve the problem that tubing pump brings, and under 50HZ condition, can reach 1000m
3the above discharge capacity of/d can improve lift by increasing electric pump progression simultaneously, meets middle-deep well lifting requirement.Although the characteristic of electric submersible pump can be mated with SAGD high yield liquid measure at present, electric submersible pump can steady production also depend on that oil well has certain fluid supply capacity and down-hole ambient temperature.For electric submersible pump oil well production, impact for fear of free gas on electric pump operation, generally to adopt timely emptying casing gas to reduce casing pressure, assurance oil well is being produced under certain submergence, and for SAGD oil well, in order to prevent flash distillation, must carry out the production that builds the pressure of oil pressure and casing pressure, need sleeve pipe and oil pipe annular pressure value higher than saturation vapour pressure corresponding to this temperature, generally need pressure control more than 1.0MPa.Higher casing pressure declines producing fluid level; SAGD oil well daily fluid production rate is large simultaneously; also very easily there is the producing fluid level rapid situation that declines; once electric pump finds time to burn with regard to likely occurring that motor is underload; the conventional method that electric submersible pump adopts is the underload protection of electric current, running current during lower than underload setting value underload protection come into force to shut down and process.General setting value is rated operational current 75%～80%; this method there is certain limitation; the height of electric pump well real work electric current under production status is affected by various factors; standard that should not be using this as underload setting valve; and there is instantaneity in the setting of underload protection value, along with oil well liquid output situation changes, if setting value is adjusted not in time or the inaccurate electric pump that just there will be because of underload setting frequent shutdown; will certainly greatly reduce electric pump working life, cause unnecessary loss.
Summary of the invention
Therefore in the situation that having pump efficiency, maintain unit continuous operation is a kind of reasonably strategy as far as possible, in the not in-problem situation of unit pump condition, as long as unit not in idling conditions, just should keep producing.Adopt rational protective measure, guarantee that it is a new technical thought that extends electrical machinery life that SAGD oil well can be produced continuously.
For achieving the above object, the present invention proposes a kind of kill-job protective gear of electric submersible pump, described electric submersible pump is arranged in an oil well, described kill-job protective gear comprises: producing fluid level monitoring device, be arranged at the well head of described oil well, be sent to described automatic watering device for monitoring and obtain the producing fluid level data of described oil well; Downhole temperature monitoring device, is arranged at the pump head position of described electric submersible pump, is sent to described automatic watering device for monitoring and obtain the temperature value of described electric submersible pump motor; Automatically watering device, connects described producing fluid level monitoring device and downhole temperature monitoring device, for generating guard sign according to the temperature value of described producing fluid level data or motor, and according to described guard sign, water mixing is carried out in the ring set space of described oil well.
For achieving the above object, the present invention proposes a kind of kill-job guard method of electric submersible pump, monitor and obtain the producing fluid level data of described oil well; Monitor and obtain the temperature value of described electric submersible pump motor; Generate guard sign according to the temperature value of described producing fluid level data or motor; According to described guard sign, water mixing is carried out in the ring set space of described oil well.
By kill-job protective gear and the method for electric submersible pump of the present invention; make producing fluid level on-line monitoring, downhole temperature Real-Time Monitoring and automatic watering device interlocking; utilize automatic water mixing to make SAGD barreler in the time that producing fluid level is too low, carry out water mixing and prevent from triggering underload shutdown; and can be by the operating temperature of automatic water mixing reduction electric submersible pump; prevent that electric submersible pump from occurring that overtemperature damages; assurance producing fluid level is stable makes electric submersible pump continuous operation, realizes the continuous production of oil well.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, forms the application's a part, does not form limitation of the invention.In the accompanying drawings:
Fig. 1 is the kill-job protective gear structural representation of the electric submersible pump of one embodiment of the invention.
Fig. 2 is the kill-job guard method flow chart of the electric submersible pump of one embodiment of the invention.
Fig. 3 is the kill-job protective gear scheme of installation of the electric submersible pump of the present invention's one specific embodiment.
Embodiment
Below coordinate preferred embodiment graphic and of the present invention, further set forth the technological means that the present invention takes for reaching predetermined goal of the invention.
Fig. 1 is the kill-job protective gear structural representation of the electric submersible pump of one embodiment of the invention.As shown in Figure 1, electric submersible pump is arranged in an oil well, and described kill-job protective gear comprises:
Producing fluid level monitoring device 1, is arranged at the well head of oil well, is sent to automatic watering device 3 for monitoring and obtain the producing fluid level data of oil well;
Downhole temperature monitoring device 2, is arranged at the pump head position of electric submersible pump, is sent to automatic watering device 3 for monitoring and obtain the temperature value of electric submersible pump motor;
Automatically watering device 3, connects producing fluid level monitoring device 1 and downhole temperature monitoring device 2, for generating guard sign according to the temperature value of producing fluid level data or motor, and according to guard sign, water mixing is carried out in the ring set space of oil well.
In the present embodiment, the producing fluid level monitoring device 1 of installing at SAGD oil well can be HYJ-1 type automatic liquid level monitor, discharge by trace the infrasonic wave that the associated gas in well produces, the principle of utilizing sonar to go up to survey, in conjunction with automatic control technology, realize the timing of sound wave and launch, gather, process, upload, realize the automatic monitoring of producing fluid level, change by the monitoring pumping well annulus liquid level degree of depth and surface casing pressure, generate the producing fluid level data of oil well.In the time occurring producing fluid level data lower than setting value, watering device 3 can carry out corresponding protective measure automatically.
In the present embodiment, HYJ-1 type automatic liquid level monitor is mainly made up of wellhead assembly, controller, special tool and annex, nitrogen bottle and high pressure hose and liquid level monitor data management system CD, is described as follows:
Wellhead assembly: formed by Automatic air gun assembly, gas charging system (comprising reduction valve, high pressure hose, connecting body assembly, high-pressure nitrogen bottle), microphone assembly, pressure sensor assembly etc.Mainly complete sounding, accept acoustic signal and casing pressure signal and convert thereof into the task of electrical signal.It is to adopt inflation percussion or venting percussion that user need to select according to the casing pressure situation in well before test starts.If casing pressure is less than 0.3MPa, should adopt inflation percussion, need to connect high-pressure air source.If casing pressure is greater than 0.3MPa, adopt venting trigger method.
Controller: formed by panel assembly, motherboard power supply board component, battery component, cabinet etc.Controller adopts echo sounding principle, and pressure measurement adopts high-precision pressure transducer.
Special tool and annex: Hook wrench, screw wrench, threaded collar special tool, connection, charging wire.
Liquid level monitor data management system CD: install on user's computer.Can complete controller and microcomputer communication, test data enter the functions such as library storage, data processing, interpretation of result printing.
Its working principle is under the control of controller, relies on well casing gas or external compression gas expansion sounding, and microphone receives tubing coupling and liquid level reflection wave signal, and the processing of via controller Filtering Analysis calculates the velocity of sound and oil-well level.
In the present embodiment, downhole temperature monitoring device 2 comprises: thermocouple wire and thermometric instrument; Wherein,
Thermocouple wire, for producing thermal electromotive force signal according to the temperature of the pump head position of electric submersible pump;
Thermometric instrument, for gathering thermal electromotive force signal, the temperature value of the motor that Heat of Formation electromotive force signal is corresponding.
In the present embodiment; electric submersible pump is SAGD well high temperature electric submersible pump; it is lowered to design attitude with Φ 114mmN80 plain end oil well pipe; thermocouple wire is lower to electric submersible pump pump head position in oil pipe, adopt thermocouple temperature measurement form, thermocouple wire quantity is not recommended single; suggestion is more than 3; avoid the false judgment that occurs that single-point distortion causes,, in the time that more than 2 o'clock temperature exceedes set temperature value, watering device 3 just can carry out corresponding protective measure automatically.In 10m to 30m scope, there will not be more than 3 ℃ because downhole temperature changes, therefore monitor electric submersible pump pump head position temperature and can be considered as motor place temperature.
In the present embodiment, watering device 3 comprises automatically: alarm device, motor-operated control valve and water storing device; Wherein,
Alarm device, connects producing fluid level monitoring device 1, downhole temperature monitoring device 2 and motor-operated control valve, for receiving the temperature value of producing fluid level data and motor;
When producing fluid level data are during lower than setting value, alarm device sends a liquid level guard sign to motor-operated control valve;
Motor-operated control valve, connects water storing device, according to liquid level guard sign control water storing device, water mixing is carried out in the cover space of changing of oil well, stops water mixing after producing fluid level reaches desired value, completes producing fluid level and supplements, and guarantees motor normal work continuously.
In the time that temperature value exceedes predetermined temperature value, alarm device sends a temperature alarm signal to motor-operated control valve;
Motor-operated control valve, carries out cooling water kill-job according to temperature alarm signal control water storing device, reduces motor ambient temperature, finishes water mixing after mixing a certain amount of water, keeps motor to maintain normal working temperature.
Fig. 2 is the kill-job guard method flow chart of the electric submersible pump of one embodiment of the invention.As shown in Figure 2, described method comprises:
Step S201, monitors and obtains the producing fluid level data of oil well;
Step S202, monitors and obtains the temperature value of electric submersible pump motor;
Step S203, generates guard sign according to the temperature value of producing fluid level data or motor;
Step S204, carries out water mixing according to guard sign to the ring set space of oil well.
In step S201, the producing fluid level data of monitoring and obtain oil well comprise: the monitoring pumping well annulus liquid level degree of depth and surface casing pressure change, and generate the producing fluid level data of oil well.
In step S202, the temperature value of monitoring and obtain electric submersible pump motor comprises: produce thermal electromotive force signal according to the temperature of the pump head position of electric submersible pump; Gather thermal electromotive force signal, the temperature value of the motor that Heat of Formation electromotive force signal is corresponding.
For kill-job protective gear and method to above-mentioned electric submersible pump are more clearly explained; describe below in conjunction with a specific embodiment; but it should be noted that this embodiment does not form the present invention the present invention is limited improperly in order to illustrate better.
Fig. 3 is the kill-job protective gear scheme of installation of the electric submersible pump of the present invention's one specific embodiment.As shown in Figure 3, electric submersible pump 4 is arranged at down-hole, and downhole temperature monitoring device 2 is measured electric submersible pump motor temperature by thermocouple wire, and producing fluid level monitoring device 1 is arranged at well head, for the height of liquid level under monitor well.
Automatically watering device 3 is arranged at outside well, carries out high temperature alarm or liquid level height alarm for downhole temperature or the liquid level height measured according to downhole temperature monitoring device 2 and producing fluid level monitoring device 1, in oil well, carries out water mixing.
Particularly, the reasonable producing fluid level of electric submersible pump in a certain oil well is 300 meters, 218 ℃ of the theoretical heatproofs of electric submersible pump.
The first situation: in the time that producing fluid level is greater than 400 meters, automatically watering device 3 sends liquid level height alarm, and motor-operated control valve is opened, and oil well is carried out to water mixing, in the time of build-up of fluid to 320 meter left and right, alarm is removed and is stopped water mixing.
The second situation: when electric submersible pump work, temperature rises gradually, in the time that temperature reaches 210 ℃, watering device 3 sends high temperature alarm automatically, and motor-operated control valve is opened, and to carrying out water mixing cooling in oil well, until electric submersible pump temperature is reduced to 200 ℃, stops water mixing.
By kill-job protective gear and the method for electric submersible pump of the present invention; make producing fluid level on-line monitoring, downhole temperature Real-Time Monitoring and automatic watering device interlocking; utilize automatic water mixing to make SAGD barreler in the time that producing fluid level is too low, carry out water mixing and prevent from triggering underload shutdown; and can be by the operating temperature of automatic water mixing reduction electric submersible pump; prevent that electric submersible pump from occurring that overtemperature damages; assurance producing fluid level is stable makes electric submersible pump continuous operation, realizes the continuous production of oil well.
Above-described specific embodiment; object of the present invention, technological scheme and beneficial effect are further described; institute is understood that; the foregoing is only specific embodiments of the invention; the protection domain being not intended to limit the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (7)
1. a kill-job protective gear for electric submersible pump, described electric submersible pump is arranged in an oil well, it is characterized in that, and described kill-job protective gear comprises:
Producing fluid level monitoring device, is arranged at the well head of described oil well, is sent to described automatic watering device for monitoring and obtain the producing fluid level data of described oil well;
Downhole temperature monitoring device, is arranged at the pump head position of described electric submersible pump, is sent to described automatic watering device for monitoring and obtain the temperature value of described electric submersible pump motor;
Automatically watering device, connects described producing fluid level monitoring device and downhole temperature monitoring device, for generating guard sign according to the temperature value of described producing fluid level data or motor, and according to described guard sign, water mixing is carried out in the ring set space of described oil well.
2. the kill-job protective gear of electric submersible pump according to claim 1, is characterized in that, described producing fluid level monitoring device comprises: automatic liquid level monitor, change for monitoring the pumping well annulus liquid level degree of depth and surface casing pressure, and generate the producing fluid level data of oil well.
3. the kill-job protective gear of electric submersible pump according to claim 1, is characterized in that, described downhole temperature monitoring device comprises: at least three thermocouple wires and thermometric instrument; Wherein,
Described thermocouple wire, for producing thermal electromotive force signal according to the temperature of the pump head position of described electric submersible pump;
Described thermometric instrument, for gathering described thermal electromotive force signal, generates the temperature value of the motor that described thermal electromotive force signal is corresponding.
4. the kill-job protective gear of electric submersible pump according to claim 1, is characterized in that, watering device comprises automatically: alarm device, motor-operated control valve and water storing device; Wherein,
Described alarm device, connects described producing fluid level monitoring device, downhole temperature monitoring device and motor-operated control valve, for receiving the temperature value of described producing fluid level data and motor;
In the time that described producing fluid level data exceed predetermined temperature value lower than setting value or described temperature value, described alarm device sends a guard sign to described motor-operated control valve;
Described motor-operated control valve, connects described water storing device, for water mixing being carried out in the ring set space of described oil well according to water storing device described in described guard sign control.
5. a kill-job guard method for electric submersible pump, is characterized in that,
Monitor and obtain the producing fluid level data of described oil well;
Monitor and obtain the temperature value of described electric submersible pump motor;
Generate guard sign according to the temperature value of described producing fluid level data or motor;
According to described guard sign, water mixing is carried out in the ring set space of described oil well.
6. method according to claim 5, is characterized in that, described monitoring the producing fluid level data of obtaining described oil well comprise:
The monitoring pumping well annulus liquid level degree of depth and surface casing pressure change, and generate the producing fluid level data of oil well.
7. method according to claim 5, is characterized in that, described monitoring the temperature value that obtains described electric submersible pump motor comprise:
Produce thermal electromotive force signal according to the temperature of the pump head position of described electric submersible pump;
Gather described thermal electromotive force signal, generate the temperature value of the motor that described thermal electromotive force signal is corresponding.
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| CN201410054165.7A CN103850921B (en) | 2014-02-18 | 2014-02-18 | A kind of kill-job protective gear of electric submersible pump and method |
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| CN201410054165.7A CN103850921B (en) | 2014-02-18 | 2014-02-18 | A kind of kill-job protective gear of electric submersible pump and method |
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| CN103850921B CN103850921B (en) | 2015-11-18 |
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| CN103573598A (en) * | 2012-08-06 | 2014-02-12 | 中国石油天然气股份有限公司 | System and method for controlling submersible pump |
| CN203809269U (en) * | 2014-02-18 | 2014-09-03 | 中国石油天然气股份有限公司 | Well-killing protection device for electric submersible pump |
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2014
- 2014-02-18 CN CN201410054165.7A patent/CN103850921B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1388303A (en) * | 2002-07-19 | 2003-01-01 | 许楠 | Dynamic surface closed-loop control system for oil well |
| CN201581871U (en) * | 2009-04-20 | 2010-09-15 | 周宝星 | Coal bed gas extraction pump return water device |
| RU2421605C1 (en) * | 2010-02-19 | 2011-06-20 | Общество С Ограниченной Ответственностью (Ооо) "Рн-Уфанипинефть" | Procedure for operation of well equipped with electro-centrifugal pump plant with variable-frequency drive |
| RU2434128C1 (en) * | 2010-04-29 | 2011-11-20 | Открытое акционерное общество "Татнефть" имени В.Д. Шашина | Procedure for development of high viscous and heavy oil deposit by thermal treatment |
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| CN203809269U (en) * | 2014-02-18 | 2014-09-03 | 中国石油天然气股份有限公司 | Well-killing protection device for electric submersible pump |
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