Monitoring system for sucker rod

An intelligent monitoring system for a sucker rod including a monitor center, a remote wireless communication equipment communicating with the monitor center and connected with a movement detection and storage equipment of the sucker rod, a radio frequency reader/writer, and a radio frequency storage chip. The movement detection and storage equipment of the sucker rod is connected with the radio frequency reader/writer. The radio frequency storage chip is disposed on the sucker rod to store the information of the sucker rod. The monitoring system can detect and record reciprocating or circumvolving movement of the sucker rod as well as the motion state of the sucker rod in an oil well.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The invention relates to oil producing equipment, and more particularly to an intelligent monitoring system for a sucker rod.

2. Description of the Related Art

Conventional methods for extracting oil mainly depend on the lifting by means of mechanical movement. As an important part of mechanical equipment for oil extraction, a sucker rod passes the ground drive and motion state thereof to an underground oil pump. The sucker rod can transfer both reciprocating movement load of axial direction and circumvolving movement load.

In an oil extraction system using a tube oil pump, the sucker rod moves in a to and fro mode. When the movement exceeds a certain circle number, the suck rod easily suffers fatigue fracture. Thus, the oil extraction system collapses. In an oil extraction system using a screw pump, the sucker rod moves in a whirligig mode and passes torsion load. When the movement exceeds a certain circle number, the suck rod also suffers fatigue fracture. Thus, the oil extraction system collapses. When one sucker rod is replaced, due to absence of test equipment, old and new sucker rods are usually employed at the same time, and then some overused sucker rods suffer fatigue fracture because of overloading. The oil output may be greatly decreased and the maintenance cost for the system is very high.

SUMMARY OF THE INVENTION

In view of the above-described problems, it is one objective of the invention to provide an intelligent monitoring system for a sucker rod. The monitoring system can detect and record the number of the reciprocating or circumvolving movement and monitor the motion state or current load of the sucker rod.

To achieve the above objective, in accordance with one embodiment of the invention, there is provided an intelligent monitoring system for a sucker rod comprising:a) a monitor center;b) a remote wireless communication equipment;c) a movement detection and storage equipment of the sucker rod;d) a radio frequency (RF) reader/writer; ande) a RF storage chip;whereinthe remote wireless communication equipment communicates with the monitor center and connects with the movement detection and storage equipment of the sucker rod; the movement detection and storage equipment of the sucker rod connects with the RF reader/writer; the RF storage chip is disposed on the sucker rod to store the information of the sucker rod;the RF reader/writer reads or writes the parameter of the sucker rod from the RF storage chip; the movement detection and storage equipment of the sucker rod detects and stores the motion state of the sucker rod, the motion state comprising the number of reciprocating or circumvolving movement and the load of the sucker rod; the remote wireless communication equipment sends the information stored in the movement detection and storage equipment of the sucker rod to the monitor center so that the monitor center obtains the work state of an oil well and the sucker rod therein; the monitor center feedbacks the motion state of the sucker rod and alerts the abnormal state of the oil well; andthe movement detection and storage equipment of the sucker rod comprises a main microprocessor and elements connected therewith, the elements comprising a watchdog circuit, a signal conditioning circuit, a flash memory, and a USB interface circuit; the signal conditioning circuit is further connected with a current transformer; and the main microprocessor is connected with the remote wireless communication equipment.

In a class of this embodiment, the RF storage chip stores information such as the raw material, manufacturer, manufacturing date, ID number, and the number of reciprocating or circumvolving movement of the sucker rod. One end surface of the sucker rod comprises a groove in which the RF storage chip is embedded. Optionally, a chip box is disposed in the sucker rod for receiving the RF storage chip. The chip box is connected to the head of the sucker rod using a screw. The RF storage chip can also be put in a joint hoop connecting two sucker rods. When used in down hole, according to demand, a plurality of sucker rods embedded with the RF storage chips can be connected in turn to constitute a sucker rod pole.

In a class of this embodiment, the RF reader/writer comprises a second microprocessor and elements connected therewith, the elements comprising a RF transceiver module, a keyboard, an LCD, a voice output module, and a buzzer. The RF transceiver module is further connected with an antenna.

In a class of this embodiment, the RF storage chip comprises a RF front end module having an antenna, an LC resonator connected with the RF front end module. The LC resonator is connected with a digital storage module via a modem. The digital storage module is further connected with a timer module.

In a class of this embodiment, the remote wireless communication equipment is a GSM communication module, GPRS communication module, or 3G communication module. The main microprocessor is PIC18F6620. The second microprocessor is LPC2138. The flash memory is AT45DB081B. The LCD is a display module. The RF transceiver module employs a CLRC632 chip.

Prior to the package of the sucker rod, such primary information as the raw materials, manufacturer, the manufacturing date, and the ID number of the sucker rod have been written into the RF storage chip. Thus, a private ID is established for the sucker rod. When the sucker rod is used underground, such information as the oil well site, the sequence number of the oil well, the time, and the downhole number of the sucker rod is written into the RF storage chip using the RF reader/writer. The movement detection and storage equipment of the sucker rod stores the motion state of the sucker rod, for example, the number of reciprocating or circumvolving movement. When rising up from the oil well, the RF reader/writer writes the movement number of the sucker rod into the RF storage chip. Thus, the movement number of the sucker rod is recorded. As needed, the forecasting remaining life of the sucker rod can also be written into the RF storage chip according to the usage state thereof. At the same time, the ID number of the newly-replaced sucker rod which will be used downhole should be stored in the movement detection and storage equipment of the sucker rod so as to monitor the newly-replaced sucker rod. There is an interface between the movement detection and storage equipment of the sucker rod and the remote wireless communication equipment. They are connected using a serial port. The information stored in the movement detection and storage equipment of the sucker rod is send to the monitor center via the remote wireless communication equipment. When abnormal failure occurs, alert information is sent to the monitor center.

In this system, a power supply system of a pumping unit on the ground provides the power for the movement detection and storage equipment of the sucker rod and the remote wireless communication equipment. When the power supply system breaks off, lithium batteries or capacitors are used to provide power. The motion state information of the sucker rod before power failure is stored in the movement detection and storage equipment of the sucker rod. The information of the power failure is then sent to the monitor center for alerting. The RF reader/writer is powered by lithium batteries, and when the power is insufficient, the power supply system of the pumping unit on the ground is also available.

Advantages of the invention are summarized below. As an independent electronic account number is established, the intelligent monitoring and management of the sucker rod can be achieved with the cooperation of the monitoring system. The sucker rod and the monitoring system thereof can be used at oil fields in a plain land, in desert, or on the sea. In addition, the usage state of the sucker rod that is transported to a warehouse can be checked through reading the RF reader/writer. The sucker rod are classified and placed according to the usage number thereof. The sucker rods having similar usage number can be used in coordination, which effectively avoids the problem of the mix use of the sucker rods having different service life and achieves intelligent management of the sucker rods. Thus, such benefits as the reduction of accidents, the reduction of maintenance costs, and remarkable efficiency improvement are realized.

In the drawings, the following reference numbers are used:1. Monitor center;2. Remote wireless communication equipment;3. RF reader/writer;4. Movement detection and storage equipment of the sucker rod;5. RF storage chip;6. Voice output module;7. Buzzer;8. RF transceiver module;9. Antenna;10. Second microprocessor;11. First RS232 serial port;12. Keyboard;13. LCD;14. USB interface circuit;15. Watchdog circuit;16. Flash memory;17. Current transformer;18. Signal conditioning circuit;19. Main microprocessor;20. Second RS232 serial port;21. Third RS232 serial port;22. Antenna of RF memory chip;23. RF front end module;24. LC resonator;25. Modem module;26. Digital storage module;27. Timer module;28. Sucker rod;29. Joint hoop.

DETAILED DESCRIPTION OF THE EMBODIMENTS

For further illustrating the invention, experiments detailing an intelligent monitoring system for a sucker rod are described below. It should be noted that the following examples are intended to describe and not to limit the invention.

As shown inFIGS. 1-5, an intelligent monitoring system for a sucker rod comprises a monitor center1and a remote wireless communication equipment2which communicates with the monitor center1. The remote wireless communication equipment2is connected to a movement detection and storage equipment of the sucker rod4. The movement detection and storage equipment of the sucker rod4is connected with a RF reader/writer equipment3. In addition, a RF storage chip5is embedded in the sucker rod28to store information of the sucker rod28.

In this embodiment, the RF memory chip5is embedded in a groove disposed at an end surface of the sucker rod28which is connected using a joint hoop29. The RF reader/writer3reads and writes the parameter of the sucker rod28by reading or writing the RF memory chip5. The movement detection and storage equipment of the sucker rod4stores the record of the number of reciprocating and circumvolving movement and load data of the sucker rod28. The information stored in the movement detection and storage equipment of the sucker rod4is send to the monitor center1via the remote wireless communications equipment2. Thus, the monitor center1collects the real-time work state of the oil well and the sucker rod. The monitor center1monitors the motion state of the sucker rod28and alerts the abnormal state of the oil well.

The RF reader/writer3comprises a second microprocessor10, a RF transceiver module8, a keyboard12, an LCD13, a voice output module6, a buzzer7, and a first RS232 serial port11, all of which connected with the second microprocessor10. The RF transceiver module8is also connected with an antenna9. Chip CLRC632 is used in the RF transceiver module8. The second microprocessor10is LPC2138 and connected to the LCD13, voice output module6, buzzer7, and keyboard12via an I/O port. The read, write, and confirmation of the RF memory chip5are achieved using the keyboard12. The D/A output pin of the second microprocessor10outputs voice. The voice is amplified by a power amplifier and then sent into headphones or speakers which suggest the success or failure of reading/writing and operation. When the reading/writing is successful, the buzzer7produces beeps, and a voice is produced to suggest success. The RF reader/writer3can work in either HF band or UHF band.

The RF storage device5comprises a RF front-end module23with an antenna22and an LC resonator24connected with the RF front-end module23. The LC resonator24is connected to a digital storage module26via a modem module25. The digital storage module26is further connected with a timer module27.

The main parameters of the sucker rod28are written into the RF storage chip5prior to the package of the sucker rod28. When the sucker rod28is put into an oil well, the ID number thereof is recorded by the movement detection and storage equipment of the sucker rod4. When the sucker rod is working, the movement number thereof is recorded in a flash memory16disposed inside the movement detection and storage equipment of the sucker rod4. The movement detection and storage equipment of the sucker rod4recording the movement number of the sucker rod comprises a main microprocessor19and elements connected therewith, the elements comprising a watchdog circuit15, the flash memory16, a USB interface circuit14, a current transformer17, a signal conditioning circuit18, a second RS232 serial port20, and a third RS232 serial port21. The type of the first microprocessor19is PIC18F6620. The type of the watchdog circuit15is chip 25043 with functions of preventing the program from running away or falling into an infinite loop. The type of the flash memory is AT45DB081B whose main function is to store needed information when the power breaks off, such as ID number of the sucker rod28and the current movement number of the sucker rod28. The type of the USB interface circuit14is USB controller CH375B connected with the main microprocessor19. The data in the movement detection and storage equipment of the sucker rod can be written into a USB disk. Thus, the movement number of the sucker rod28can be stored in the USB disk, and technicians can get the on-site data of the oil well therefrom. The data will be taken back to the monitor center1for updating the information of the sucker rod. The current transformer17detects the movement number of the sucker rod28. An output of the current transformer17is connected to an input end of the signal conditioning circuit18. The output end of the signal conditioning circuit18is connected to an A/D converter of the main microprocessor. The current transformer17measures a one-phase current value of a three phase power supply. The current value is transmitted to an A/D converter port of the main microprocessor via the signal conditioning circuit18. Thus, the movement number of the sucker rod28is collected. If a reciprocating oil pump is used, the measurement of the movement number of the sucker rod28is achieved by measuring the maximum current value in one cycle. If a screw oil pump is used, the measurement of the movement number of the sucker rod28is achieved by measuring the frequency of a motor.

In this embodiment, a GSM communication module is used in the remote wireless communications equipment2. The GSM communication module is connected to the movement detection and storage equipment of the sucker rod4via the second RS232 serial port20. The movement detection and storage equipment of the sucker rod4is connected to the first RS232 serial port11of the RF reader/writer3via the third RS232 serial port21. When rising up from the well, the movement number of the sucker rod28stored in the movement detection and storage equipment of the sucker rod4is written into the RF storage chip5of the sucker rod28. Thus, the movement number of the sucker rod28is collected. At the same time, the RF reader/writer3reads the ID number of a newly-introduced sucker rod28and then writes the ID number into the movement detection and storage equipment of the sucker rod4for inquiry of the data of the sucker rod28.