CN101026661A - Pumpingunit long-distance information transmission and control device and control method - Google Patents
Pumpingunit long-distance information transmission and control device and control method Download PDFInfo
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- CN101026661A CN101026661A CN 200710071949 CN200710071949A CN101026661A CN 101026661 A CN101026661 A CN 101026661A CN 200710071949 CN200710071949 CN 200710071949 CN 200710071949 A CN200710071949 A CN 200710071949A CN 101026661 A CN101026661 A CN 101026661A
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Abstract
The invention includes three main parts: information acquisition and control terminal 1 for pumping unit installed on pumping unit on site; telemonitoring device 2 for receiving operating data from and sending control commands to remote pumping unit; being broken away from monitoring center, online monitoring devices 3 based on fixed telephone, 'Xiaolingtong'and handset. Through public telephone network in DTMF signal form and telemonitoring device 2, information acquisition and control terminal 1 is connected to online assistant monitoring devices 3 including fixed telephone, 'Xiaolingtong'and handset. Possessing functions of transferring running information of remote pumping unit, remote control, reporting fault of pumping unit, and implementing unmanned inspection and operation, the invention increases yield of oil well, and reduces accident rate.
Description
(1) technical field
The present invention relates to remote information transmission and control field, particularly a kind of remote information transmission and control field that is used for oil-field oil pumper.
(2) background technology
Various faults appear in regular meeting during oil pumper, when the underground fluid supply capacity of oil well during less than discharge rate, will cause liquid hammer and vaccuum phenomenon.Liquid hammer produces heavily stressed meeting and causes sucker rod to come off, rupture on sucker rod, oil well is stopped production; When twitching sky, although oil pumper work does not have liquid measure output, oil pumper wastes energy; When driving-belt or key pin came off in the oil pumper driving-chain, motor was still rotating in addition, and oil pumper does not have liquid measure output equally, and same the generation wastes, or the like.Because the ruuning situation of oil pumper is related to normally carrying out of production task,, guarantee to produce normally so need as far as possible early to find fault and timely the eliminating.The personnel that manually constantly patrol and examine or accredit specially monitor it is not that easily promptly allowing to send the special messenger to check also has its shortcoming: 1. can not be in time to the oil pumper inspection of fault; 2. human cost is too high; 3. precision is not high yet.Application number is 200510066430.4 patent, proposition is based on the remote wireless monitoring system of GPRS network, can realize operation monitoring to the oil field, but often the region area is wider for the operating location of petroleum industry, and be the comparatively inconvenient place of living environment, can not overcome some local no network coverage, or the situation of jitter.Set up transmitting base station as specialty in addition, cost is too high.It also is not enough in addition the oil pumper in field only being carried out the remote information transmission, and the technical scheme of putting down in writing in the patent document as the patent No. 97100222, this technical scheme can only realize the remote information transmission, but can not realize Long-distance Control.Detecting under fault and other situation Long-distance Control that must realize to oil pumper, do some necessary emergency processings, could really increase work efficiency and the safety of guaranteeing is arranged.
(3) summary of the invention
The object of the present invention is to provide and a kind ofly can realize long-range oil pumper operation information transmission, oil pumper Long-distance Control, report oil pumper fault, realize unmanned patrol and operation, improve oil well output, reduce a kind of Pumpingunit long-distance information transmission and the control device and the method based on public telephone network of rate of failure.
Of the present invention consisting of:
The technical scheme of product of the present invention is: it comprises: be installed in oil pumper information gathering and control terminal 1 on the on-the-spot oil pumper, carry out remote oil pumper service data receives, control command sends long-distance monitorng device 2 and based on on-line monitoring device 3 three parts of the disengaging Surveillance center of landline telephone, Personal Handyphone System and mobile phone, described oil pumper information gathering and control terminal 1 public telephone network by the dtmf signal form and long-distance monitorng device 2 link to each other with online auxiliary monitoring device 3 based on the disengaging Surveillance center of landline telephone, Personal Handyphone System and mobile phone;
Control method of the present invention is: this method comprises remote information transmission mode and long-range oil pumper control model, enter the order wait state after Surveillance center's computer (11), remote monitoring software and oil pumper information gathering and control terminal (1) startup and the operation, when abnormal conditions appear in remote scene, detect under the fault in oil pumper information gathering and control terminal (1), system enters the work of remote information transmission mode; When Surveillance center sent control command, then system entered the work of long-range oil pumper control model;
The control method of described remote information transmission mode work divided for three steps:
1.1, various kinds of sensors (6) detects the running status of oil pumper and ambient environmental conditions thereof and image data and information passed to primary processor (5);
1.2, primary processor (5) handles and controls input data and information;
1.3, the data after handling through oil pumper information gathering and control terminal (1) are transferred to long-distance monitorng device (2) by public telephone network;
The control method of described long-range oil pumper control model work divided for four steps:
2.1, long-distance monitorng device (2) send to connect password and bind command to oil pumper information gathering and control terminal (1);
2.2, oil pumper information gathering and control terminal (1) connect with long-distance monitorng device (2);
2.3, password and bind command are sent to the oil pumper information gathering to Surveillance center's computer (11) and control terminal (1) control command sends connecting by microcomputer interface;
2.4, after oil pumper information gathering and control terminal (1) receive control command, realize Long-distance Control by primary processor (5).
The present invention also has some technical characterictics like this:
1, described oil pumper information gathering and control terminal 1 comprise that primary processor 5, transducer 6, actuator 7, phone pick out control circuit 8 and voice store alarms module 9, and described transducer 6, actuator 7, phone pick out control circuit 8 and link to each other with primary processor 5 respectively with voice store alarms module 9;
2, described long-distance monitorng device 2 comprises: DTMF coding/decoding apparatus 4 and Surveillance center's computer 11; Described DTMF coding/decoding apparatus 4 picks out control circuit 12 by primary processor 10, phone and Surveillance center's communication interface 13 is formed, and described phone picks out control circuit 12 1 ends and telephone network links, and the other end and primary processor 10 join; Described Surveillance center communication interface 13 1 ends and Surveillance center's computer 11 link, and the other end and primary processor 10 join, and described Surveillance center computer 11 is equipped with remote monitoring software and associated databases management software in advance;
3, the online auxiliary monitoring device 3 of described disengaging Surveillance center based on landline telephone, Personal Handyphone System and mobile phone is all kinds of communicating terminals of dialing corresponding oil pumper information gathering and control terminal 1 number, comprises landline telephone, Personal Handyphone System or mobile phone;
In Pumpingunit long-distance information transmission of the present invention and the control device, oil pumper information gathering and control device are used for gathering in real time oil pumper operation information and ambient condition information, simultaneously data being delivered to primary processor handles, send to Surveillance center by telephone network after the packing data, reception of oil pumper information gathering and control device and judgement are from the signal of telephone network in addition, and, be converted to control command to oil pumper with its decoding; Realize the reception of remote oil pumper service data and ambient condition information data, in addition the control command of coming Surveillance center's computer to send being sent to telephone network based on the Dual Tone Multifrequency coding and decoding device by computer interface input monitoring centralized computer; Monitoring software is installed on Surveillance center's computer, receives on-the-spot oil pumper service data and ambient condition information data in real time, and deals with analysis and storage, but the while transmitting control commands.
In Pumpingunit long-distance information transmission and the control method, pass through telephone network, start remote information transmission and control device, and two kinds of mode of operations are arranged: under (1) remote information transmission mode, this device is gathered oil pumper running state data and ambient condition information data in real time, these data after treatment again at regular intervals section transfer to remote monitoring center by telephone network, again can be to oil pumper service data analyzing and processing again, and preserve through Surveillance center; Detect and analyze under oil pumper fault or the accident conditions at this device, start the remote alarms function immediately, fault data is delivered to Surveillance center or in time do not take measures the staff of Surveillance center by phone, mobile phone notice; (2) under the long-range oil pumper control model, remote monitoring center sends control command, send to oil pumper information gathering and control terminal by telephone network, after by password authentification, reception control signal and processing back control executing mechanism are finished from remote monitoring center and are instructed.
Beneficial effect of the present invention has: but automatically oil pumper running state data and ambient condition information data acquisition are also handled by device real time remote of the present invention, and transfer to Surveillance center by public telephone network, need not make an inspection tour at the staff scene, thereby the saving great amount of manpower and material resources is enhanced productivity greatly.The variation of the operational mode of oil pumper is analyzed by Surveillance center, can to common electric machine and energy-saving electric machine be controlled and fault detect, effectively avoid because the massive losses that electrical fault stops production and causes.To unexpected oil pumper fault, as steal destroying accidents such as the oil pumper Surveillance center that can in time report to the police, also can report the related work personnel with the call voice form by telephone network, do not make and can in time take emergency measures yet in Surveillance center.Simultaneously the staff of Surveillance center by monitoring computer or in the strange land by mobile phone, landline telephone is carried out Long-distance Control to oil pumping according to the data of transmission, as switching on and shutting down etc.
(4) description of drawings
Fig. 1 is Pumpingunit long-distance information transmission of the present invention and control device schematic diagram;
Fig. 2 is oil pumper information gathering of the present invention and control terminal structural representation;
Fig. 3 is a double-tone of the present invention coding/decoding apparatus structural representation frequently;
Fig. 4 is the master control flow chart of oil pumper information gathering of the present invention and control terminal;
Fig. 5 is the Long-distance Control interrupt routine flow chart of oil pumper information gathering of the present invention and control terminal;
Fig. 6 is a Surveillance center of the present invention computer monitor software flow pattern.
(5) embodiment
The present invention is described in detail below in conjunction with accompanying drawing:
In conjunction with Fig. 1, Pumpingunit long-distance information of the present invention transmission comprises with control device: oil pumper information gathering of installing on the on-the-spot oil pumper and control terminal 1, and realize long-distance monitorng device 2 that remote oil pumper service data and ambient condition information Data Receiving, control command send and form based on online auxiliary monitoring device 3 three parts of the disengaging Surveillance center of landline telephone, Personal Handyphone System and mobile phone.The public telephone network of described oil pumper information gathering and control terminal 1 by the dtmf signal form and long-distance monitorng device 2 link to each other with online auxiliary monitoring device 3 based on the disengaging Surveillance center of landline telephone, Personal Handyphone System and mobile phone.Described oil pumper information gathering and control terminal 1 can have a plurality of, the corresponding oil pumper of each terminal equipment, and a plurality of terminal equipments link to each other with Surveillance center by telephone network, form monitor network.For preventing line fault, or the line is busy problem, per 10～20 oil pumper information gatherings and control terminal 1 corresponding one or more Surveillance center 3, each oil pumper information gathering and control terminal 1 can be provided with a plurality of Surveillance center 3 and link to each other.
Miniaturization and characteristics have cheaply been considered in the design of described oil pumper information gathering and control terminal 1, and its composition comprises primary processor 5, various kinds of sensors 6, and actuator 7, phone picks out control circuit 8, voice store alarms module 9.Described various kinds of sensors 6 can comprise flowmeter, galvanometer, and speed probe, pressure sensor, infrared sensor is monitored transducer etc. and is detected the whether transducer of safe operate as normal and surrounding environment thereof of oil pumper; Described galvanometer is installed in the oil pumper dragging motor distribution box and is used to detect motor working current, described flow is taken into account pressure sensor and is installed in the oil pipeline, be used to detect the fuel-displaced situation of oil pumper, described speed probe is used for the oil pumper velocity of rotation, can judge the oil pumper operating state, described infrared sensor is can human body thermal infrared information movable near oil pumper to have determined whether the people, described monitoring transducer can and be passed Surveillance center back in real time with on-the-spot sound collection, and the staff of Surveillance center can judge that field condition is described according to on-the-spot sound.Described voice store alarms module 9 comprises a big capacity voice record chip, as ISD4004, and control circuit.Described actuator 7 can comprise electric power switch, electric moter voltage demodulator, alarming horn etc.Described phone picks out control circuit 8 double-tones decoding chip frequently, as MT8880, and peripheral circuit.Described various kinds of sensors 6, actuator 7, phone pick out control circuit 8 and link to each other with primary processor 5 respectively with voice store alarms module 9, and are subjected to primary processor 5 controls.
Described long-distance monitorng device 2 comprises: Dual Tone Multifrequency coding/decoding apparatus 4 and Surveillance center's computer 11.Described Dual Tone Multifrequency coding/decoding apparatus 4 picks out control circuit 12 by primary processor 10, phone and Surveillance center's communication interface 13 is formed.Described phone picks out control circuit 12 1 ends and telephone network links, and the other end and primary processor 10 join, and finishes dtmf signal to the digital signal conversion; Described Surveillance center communication interface 13 1 ends and Surveillance center's computer 11 link, and the other end and primary processor 10 join, and realize receiving from the on-the-spot service data of oil pumper, send simultaneously from Surveillance center's computer 11 remote control commands.Described Surveillance center computer 11 is equipped with remote monitoring software and associated databases management software in advance.
The online auxiliary monitoring device 3 of described disengaging Surveillance center based on landline telephone, Personal Handyphone System and mobile phone is all kinds of communicating terminals of dialing corresponding oil pumper information gathering and control terminal 1 number, comprises landline telephone, Personal Handyphone System and mobile phone.
Secondly, a kind of Pumpingunit long-distance information transmission and control method, this method is divided into two kinds of patterns:
(1) pattern 1: the remote information transmission mode;
(2) pattern 2: long-range oil pumper control model.
Enter the order wait state after Surveillance center's computer 11 remote monitoring softwares and oil pumper information gathering and control terminal 1 startup and operation, according to two kinds of operational modes, system mainly is divided into two program running branches.When abnormal conditions appear in remote scene, detect under the fault in oil pumper information gathering and control terminal 1, system enters pattern 1 work; When Surveillance center sent control command, then system entered pattern 2 work.
Do detailed argumentation respectively below in conjunction with Fig. 4, Fig. 5, Fig. 6:
Mainly be divided into three steps under the pattern 1 remote information transmission mode:
(1) detects the running status and the ambient condition information thereof of oil pumper and pass to primary processor 5 by various kinds of sensors 6;
After oil pumper information gathering and the control terminal 1 device initialization, program begins, and real-time real clock picks up counting, because the pumping unit apparatus operation is relatively stable, can set per 15 seconds to each running status amount collection of oil pumper once.Gather and finish to deposit in oil pumper information gathering and control terminal 1 memory; Wait for next 15 seconds arrival, circle collection;
(2) finish information processing and control by primary processor 5;
(3) be transferred to long-distance monitorng device 2 through the data after oil pumper information gathering and control terminal 1 processing by public telephone network;
Transfer to dual-tone multifrequency coding/decoding apparatus (DTMF) 4 from oil pumper information gathering and control terminal 1 information through telephone network, phone picks out control circuit switching signal, handle by primary processor 10, send to Surveillance center's computer 11 through Surveillance center's communication interface 13 again.
Remote monitoring software and associated databases management software are housed in Surveillance center's computer 11 in advance, monitor communication interface 13 behind this software startup, then read in data as arriving, and, be divided into two work branches according to two kinds of different situations in the step 2 to this Data Management Analysis with signal:
A. if per 60 minutes regularly by dual-tone multifrequency coding/decoding apparatus (DTMF) 4 receive from the oil pumper service data, deposit database in after then will data showing;
If b. listen to the oil pumper operation irregularity signal of automatic network, software is made warning and data is deposited in database, and the staff is in time taken emergency measures, and can enter mode of operation 2 and operate.Also can phone or the mobile phone of directly dialing under some failure condition not the staff of Surveillance center be set at oil pumper information gathering and control terminal 1, the control circuit of voice store alarms module 9 is searched the voice segments of corresponding fault type correspondence, and play this section voice, with fault with the speech form personnel that report.
(1) sends connection password and bind command
Long-distance monitorng device 2 enters mode of operation 2 in 11 safety supervision controls of Surveillance center's computer software, at first the staff must input the remote control operation password, can prevent the misoperation or the illegal operation of unrelated person.After confirming operator password, monitoring software is sent to dual-tone multifrequency coding/decoding apparatus 4 by microcomputer interface connecting password and bind command, is sent to oil pumper information gathering and control terminal 1 by telephone network again.
(2) connect
Oil pumper information gathering and control terminal 1 are after receiving connection request, and program enters Long-distance Control and interrupts.Program reads the connection password, and whether the verification operation password is effective, then interrupts connecting getting back to main program as invalid, further prevents illegal telnet operation; As effectively then send checking by signal to long-distance monitorng device 2, Surveillance center's computer 11 is confirmed to connect effectively and is set up.
(3) control command sends
After Surveillance center's computer 11 is confirmed to connect foundation, operating personnel can according to different operating also needs send concrete remote operation order, as the switch motor, search oil pumper operating state etc., this order microcomputer interface is sent to dual-tone multifrequency coding/decoding apparatus 4 connecting password and bind command, is sent to oil pumper information gathering and control terminal 1 by telephone network again.
(4) Long-distance Control realizes
After oil pumper information gathering and control terminal 1 received control command, by primary processor 5 analysis instruction, control executing mechanism 7 was finished concrete operation then.Time-delay is after 10 seconds behind the complete operation, detect the oil pumper service data after making the oil pumper working stability, passing Surveillance center's computer 11 again back by telephone network preserves in the remote operation database and demonstration, operating personnel confirm to operate back oil pumper operation conditions, to guarantee to operate correctness and to provide foundation for next step operation.Oil pumper information gathering and control terminal 1 withdrawed from interrupt control routine after data transmitted and finish, and got back to the main program operation.
In addition, the online auxiliary monitoring device 3 of the also available disengaging Surveillance center based on landline telephone, Personal Handyphone System and mobile phone of mode of operation 2 is finished, and basic skills is similar to top argumentation.With the phone is example, and the staff in Surveillance center can not dial oil pumper information gathering and control terminal 1 phone, and input validation password under 9 promptings of voice store alarms module is by then can the telephone key-press combination sending different control commands after the checking.
Claims (7)
1, a kind of Pumpingunit long-distance information transmission and control device, it is characterized in that it comprises: be installed in oil pumper information gathering and control terminal (1) on the on-the-spot oil pumper, carrying out remote oil pumper service data receives, the long-distance monitorng device (2) that control command sends and based on landline telephone, on-line monitoring device (3) three parts of the disengaging Surveillance center of Personal Handyphone System and mobile phone, described oil pumper information gathering and control terminal (1) public telephone network and the long-distance monitorng device (2) and by the dtmf signal form based on landline telephone, the online auxiliary monitoring device (3) of the disengaging Surveillance center of Personal Handyphone System and mobile phone links to each other.
2, Pumpingunit long-distance information transmission according to claim 1 and control device, it is characterized in that, described oil pumper information gathering and control terminal (1) comprise that primary processor (5), transducer (6), actuator (7), phone pick out control circuit (8) and voice store alarms module (9), and described transducer (6), actuator (7), phone pick out control circuit (8) and link to each other with primary processor (5) respectively with voice store alarms module (9).
3, Pumpingunit long-distance information transmission according to claim 1 and control device is characterized in that described long-distance monitorng device (2) comprising: DTMF coding/decoding apparatus (4) and Surveillance center's computer (11); Described DTMF coding/decoding apparatus (4) picks out control circuit (12) by primary processor (10), phone and Surveillance center's communication interface (13) is formed, described phone picks out control circuit (12) one ends and telephone network links, and the other end and primary processor (10) join; Described Surveillance center communication interface (13) one ends and Surveillance center's computer (11) link, and the other end and primary processor (10) join.
4, Pumpingunit long-distance information transmission according to claim 1 and control device, it is characterized in that, the online auxiliary monitoring device (3) of described disengaging Surveillance center based on landline telephone, Personal Handyphone System and mobile phone is all kinds of communicating terminals of dialing corresponding oil pumper information gathering and control terminal (1) number, comprises landline telephone, Personal Handyphone System or mobile phone.
5, a kind of Pumpingunit long-distance information transmission and control method, it is characterized in that, this method comprises remote information transmission mode and long-range oil pumper control model, enter the order wait state after Surveillance center's computer (11), remote monitoring software and oil pumper information gathering and control terminal (1) startup and the operation, when abnormal conditions appear in remote scene, detect under the fault in oil pumper information gathering and control terminal (1), system enters the work of remote information transmission mode; When Surveillance center sent control command, then system entered the work of long-range oil pumper control model;
The control method of described remote information transmission mode work divided for three steps:
1.1, various kinds of sensors (6) detects the running status of oil pumper and ambient environmental conditions thereof and image data and information passed to primary processor (5);
1.2, primary processor (5) handles and controls input data and information;
1.3, the data after handling through oil pumper information gathering and control terminal (1) are transferred to long-distance monitorng device (2) by public telephone network;
The control method of described long-range oil pumper control model work divided for four steps:
2.1, long-distance monitorng device (2) send to connect password and bind command to oil pumper information gathering and control terminal (1);
2.2, oil pumper information gathering and control terminal (1) connect with long-distance monitorng device (2);
2.3, password and bind command are sent to the oil pumper information gathering to Surveillance center's computer (11) and control terminal (1) control command sends connecting by microcomputer interface;
2.4, after oil pumper information gathering and control terminal (1) receive control command, realize Long-distance Control by primary processor (5).
6, a kind of Pumpingunit long-distance information transmission according to claim 5 and control method is characterized in that three step concrete operations under the remote information transmission mode are:
1.1, the 1 device initialization of oil pumper information gathering and control terminal, program begins, real-time real clock picks up counting, and sets every 5-15 second to each running status amount collection of oil pumper once; Gather and finish to deposit in oil pumper information gathering and control terminal 1 memory; Wait for next arrival constantly, the circle collection gathered;
1.2, primary processor (5) regularly reads the data that various kinds of sensors (6) is gathered, and the oil pumper running status is carried out accident analysis; Take place if any fault, then control executing mechanism 7 is taked corresponding the shutdown or other emergency processing, controls phone simultaneously and picks out control circuit (8), by public telephone network output fault message; Under non-failure conditions, the every 30-90 of setting device minute toward long-distance monitorng device (2) transmission primaries oil pumper operation information;
1.3, the signal of oil pumper information gathering and control terminal (1) output transfers to dual-tone multifrequency coding/decoding apparatus (4) through telephone network, phone picks out that control circuit is changed signal and signal is passed to primary processor (10) handle, and sends to Surveillance center's computer (11) through Surveillance center's communication interface (13) again; Remote monitoring software and associated databases management software are housed in Surveillance center's computer (11) in advance, monitor communication interface (13) behind this software startup, receive signal and then read in data, and data are carried out Treatment Analysis, if regularly by dual-tone multifrequency coding/decoding apparatus (4) receive from the oil pumper service data, deposit database in after then will data showing; If listen to the oil pumper operation irregularity signal of automatic network, software is made warning and data is deposited in database.
7, a kind of Pumpingunit long-distance information transmission according to claim 5 and control method is characterized in that four step concrete operations of long-range oil pumper control model are:
2.1, long-distance monitorng device (2) enters long-range oil pumper control model under Surveillance center's computer (11) control, connection password and bind command that monitoring software will be inputed by microcomputer interface are sent to dual-tone multifrequency coding/decoding apparatus (4), are sent to oil pumper information gathering and control terminal (1) by telephone network again;
2.2, oil pumper information gathering and control terminal (1) after receiving connection request, program enters Long-distance Control and interrupts; Program reads the connection password, and whether the verification operation password is effective, then interrupts connecting getting back to main program as invalid; As effectively then send checking by signal to long-distance monitorng device (2), Surveillance center's computer (11) is confirmed to connect effectively and is set up;
2.3, after Surveillance center's computer (11) confirm to connect sets up, be sent to dual-tone multifrequency coding/decoding apparatus (4) connecting password and bind command by microcomputer interface, be sent to oil pumper information gathering and control terminal (1) by telephone network again;
2.4, after oil pumper information gathering and control terminal (1) receive control command, by primary processor (5) analysis instruction, control executing mechanism (7) is finished concrete operation then; Delay time behind the complete operation 5-20 second, detect the oil pumper service data, pass Surveillance center's computer (11) again back by telephone network and preserve in the remote operation database and demonstration, oil pumper information gathering and control terminal (1) withdrawed from interrupt control routine after data transmitted and finish, and got back to the main program operation.
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| CN101667020A (en) * | 2009-09-25 | 2010-03-10 | 山东汉和能源科技有限公司 | Remote measurement and control terminal of oil pumping unit |
| CN102868743A (en) * | 2012-09-10 | 2013-01-09 | 中冶南方（武汉）自动化有限公司 | Remote control system and method for frequency converter |
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| CN103248706A (en) * | 2013-05-20 | 2013-08-14 | 哈尔滨三川科技开发有限公司 | Multifunctional remote monitoring system for oil field pumping unit and monitoring method thereof |
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| CN104220697A (en) * | 2012-01-07 | 2014-12-17 | 默林科技股份有限公司 | Horizontal directional drilling area network and methods |
| CN102868743A (en) * | 2012-09-10 | 2013-01-09 | 中冶南方（武汉）自动化有限公司 | Remote control system and method for frequency converter |
| CN103033705A (en) * | 2012-12-12 | 2013-04-10 | 深圳市凌启电子有限公司 | Test method and test system of electronic equipment |
| CN103248706A (en) * | 2013-05-20 | 2013-08-14 | 哈尔滨三川科技开发有限公司 | Multifunctional remote monitoring system for oil field pumping unit and monitoring method thereof |
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