CN104898579A - Oil pumping well data acquisition control system and method based on wireless network - Google Patents
Oil pumping well data acquisition control system and method based on wireless network Download PDFInfo
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- CN104898579A CN104898579A CN201410076737.1A CN201410076737A CN104898579A CN 104898579 A CN104898579 A CN 104898579A CN 201410076737 A CN201410076737 A CN 201410076737A CN 104898579 A CN104898579 A CN 104898579A
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- G05B19/00—Programme-control systems
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- G05B19/418—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS] or computer integrated manufacturing [CIM]
- G05B19/4185—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS] or computer integrated manufacturing [CIM] characterised by the network communication
- G05B19/41855—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS] or computer integrated manufacturing [CIM] characterised by the network communication by local area network [LAN], network structure
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
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Abstract
The invention relates to an oil pumping well data acquisition control system based on a wireless network. The oil pumping well data acquisition control system comprises a configuration computer, an industrial Ethernet, a WIA wireless gateway, well head control units, and a data acquiring terminal. The configuration computer is connected with the WIA wireless gateway through the industrial Ethernet. The well head control units are arranged on oil pumping well heads and wirelessly communicates with the data acquiring terminal and the WIA wireless gateway. An oil pumping well data acquisition control method comprises: meters transmit regularly-acquired oil pumping well data to a well head control unit in the same oil pumping well where the meters are located, wherein the well head control unit transmits the oil pumping well data to the WIA wireless gateway in real time; the configuration computer receives, through the industrial Ethernet, network state information and real-time data of each oil pumping unit transmitted from the WIA wireless gateway. The well head control units RTU are all provided with wireless routing functions and achieve data communication by means of a multi-hop network when a barrier blocks a wireless signal or the wireless signal is not very well, thereby guaranteeing data reliability.
Description
Technical field
The present invention relates to a kind of rod-pumped well data acquisition control system and method thereof, specifically a kind of rod-pumped well data acquisition control system based on WIA-PA industry wireless network and method thereof.
Background technology
In recent years, based on well site, stand, the data acquisition, process control, parameter optimization, management decision etc. of the oil gas field production scene such as storehouse show especially important, played a greater and greater role in Intelligent Recognition, data fusion, market demand etc. by the production of hydrocarbons Internet of things system that automatic technology, the communication technology, infotech merge, production of hydrocarbons Internet of Things is the inexorable trend of oil gas field informatization development.
Production of hydrocarbons Internet of things system is exactly by technology such as sensing, radio frequency, communications, object is produced to oil gas water well, metering plant, oil-gas stations storehouse and relevant collection transmission pipe network etc. and carries out comprehensive perception, realize production data automatically gather and control, oil gas field production run monitor and managment, and then improve the automatization level of production operation unit, improve promptness and the accuracy of oil gas field production decision further.
Current oil gas field all in various degree implement production of hydrocarbons robotization, digital Construction.For production data acquisition and control system is wired and wireless two kinds of directions, wired data acquisition and controlling system is all not convenient in construction, maintenance etc., and mostly current wireless system is based on Zigbee system, radio communication success ratio is low, cannot ensure the timely of whole day Monitoring Data and accuracy.
Summary of the invention
The object of the invention is to provide a kind of rod-pumped well data acquisition control system and method for realizing radio communication in WIA-PA industry wireless network completely.
The technical scheme that the present invention is adopted for achieving the above object is: based on the rod-pumped well data acquisition control system of wireless network, comprises configuration computing machine, Industrial Ethernet, WIA radio network gateway, wellhead control unit and data collection station; Configuration computing machine is connected with WIA radio network gateway by Industrial Ethernet; Wellhead control unit is arranged at oil pumping machine well head, carries out radio communication with data collection station, WIA radio network gateway.
Described wellhead control unit is multiple, and each wellhead control unit is arranged in an oil pumping well head; Each wellhead control unit and instrument form star network, also form MESH network with WIA radio network gateway.
Described wellhead control unit comprises processor module and connected I/O input/output module, three-phase electricity acquisition module, Local Communication Module, LCD MODULE, power management module, data remote interface module and WIA wireless communication module.
Described three-phase electricity acquisition module adopts resistance, current transformer, power measurement IC and signal isolating chip; After multiple resistance that is often in series of three-phase alternating current, be connected with the voltage input channel of power measurement IC by wave filter, often mutually also by voltage dependent resistor (VDR) ground connection; Three current transformers are each passed through three-phase alternating current electric wire, the parallel circuit of a resistance and two resistance of connecting is connected with between the positive-negative output end of each current transformer, be connected with amplitude limiter circuit between the two ends of parallel circuit, the two ends of amplitude limiter circuit are connected with the electric current input channel of power measurement IC by filtering circuit; The output terminal of power measurement IC is connected with processor module through signal isolating chip.
Input end and the parallel circuit being connected with resistance, two electric capacity of connecting and an electric capacity between ground of described wave filter; The two ends of electric capacity are connected with the voltage input channel of power measurement IC respectively; Another resistance is also connected with, the node ground connection between the electric capacity of two series connection between one end of resistance eutral grounding and one end of two capacity earths of connecting.
Described filtering circuit comprises resistance and electric capacity; Two input ends of filtering circuit are connected respectively by the input end of resistance with power measurement IC, are connected with two electric capacity of series connection and the parallel circuit of an electric capacity between two input ends of power measurement IC; Node ground connection between two electric capacity of series connection.
Based on the rod-pumped well data acquisition control method of wireless network, comprise the following steps:
The oil pumper data of collection are sent to the wellhead control unit with it in same rod-pumped well by each data collection station, and the electrical parameter information of oil pumper data and self collection is sent to WIA radio network gateway by this wellhead control unit, carries out data storage simultaneously;
Configuration computing machine receives by Industrial Ethernet the network state information and each oil pumper data and electrical parameter information that WIA radio network gateway sends, and sends control command to WIA radio network gateway; Control command is issued to corresponding wellhead control unit by WIA radio network gateway; If control command, wellhead control unit is according to the current rod-pumped well state of control command content detection and perform control command; If configuration order, be then sent to corresponding instrument and carry out parameter modification and configuration.
The wellhead control unit that the oil pumper data of collection are sent to it in same rod-pumped well is specially by described each data collection station: merit diagram data is wirelessly transmitted to the wellhead control unit with it in same rod-pumped well by oil pumper pressure data, wireless indicator by temperature data, wireless pressure transmitter in rod-pumped well by wireless temperature transmitter.
By merit diagram data, the wellhead control unit be wirelessly transmitted to it in same rod-pumped well comprises the following steps described wireless indicator:
Comprise 0 ~ n bag data when transmitting merit diagram data between indicator and wellhead control unit, after indicator sends 0 number bag, after wait-receiving mode to the reply data bag of wellhead control unit, start to send 1 ~ n-1 number bag continuously, do not need response; Be sent completely rear transmission n number bag, after wait-receiving mode to the reply data bag of wellhead control unit, complete this merit figure process of transmitting;
If when can not receive 0 or the response of n number bag, then indicator starts and retransmits, and retransmits 1 time, retransmit 10 times altogether, if still can not receive response, then abandon this transmitting procedure at interval of 30s;
When 0 ~ n number as whole transmission is surrounded by loss, carry out benefit packet procedures, namely after sending n number bag, wait for wellhead control unit reply data bag, in reply data bag, contain the sequence of data packet number of wellhead control unit packet Incomplete information and disappearance, indicator retransmits this deficiency of data bag continuously, and sends n number bag again, until receive wellhead control unit response merit diagram data complete after, terminate this transmitting procedure.
Described electrical parameter information comprises oil pumper three-phase voltage, three-phase current, power factor (PF), active power, reactive power, applied power, line frequency, active energy, map of current.
The present invention has following beneficial effect and advantage:
1. present invention achieves rod-pumped well data real-time automatic collecting, for the data analysis of oil gas Internet of Things and Instructing manufacture provide direct data message.
2.WIA wireless network can directly communicate within the scope of visual range 300 meters, and wellhead control unit RTU all has wireless routing function, have barrier to block or wireless signal is not good time can realize data communication by multihop network, communication success ratio reach 99%, ensure data reliability.
3. adopt wireless temperature transmitter, wireless pressure transmitter, wireless integral indicator and use the wellhead control unit design of wireless network teletransmission data, open and install convenient, save human cost, solve wiring inconvenience and be unfavorable for the problems such as maintenance.
4. adopt WIA-PA wireless communication technology, wellhead control unit can support wired and wireless telecommunications simultaneously, achieve the full-automation of Oil Field, not only achieve the real-time monitoring of oil pump running situation, for timely handling failure provides condition, also liberate a large amount of manpower, be conducive to human resources allocation optimization.Wireless technology simplifies wiring and the setting of field apparatus, optimizes field wiring and installation.
5. three-phase electricity acquisition module adopts isolation technology, achieves isolation, ensure that the security of RTU itself with other parts of RTU.
6. achieve RTU and electric quantity acquisition integrated design, the parameter information of three-phase electricity can be gathered, wellhead control unit is pumping unit of well mouth data sampling and processing, opertaing device, carries out data sampling and processing and storage and forward the data of various input quantity.
Accompanying drawing explanation
Fig. 1 is the block diagram of system of the present invention;
Wherein, 11 configuration computing machines, 12 real-time data bases, 13 netting twines, 14 Industrial Ethernet, 15WIA radio network gateway, 16 restraining masss, 17WIA wireless network, 18 wellhead control unit, 19,20,21 instrument;
Fig. 2 is upstream data flow process block diagram of the present invention;
Fig. 3 is downlink data flow process block diagram of the present invention;
Wherein, 23WIA wireless communication module, 24 processor modules, 25 three-phase electricity acquisition modules, 26WIA radio receiving transmitting module, 27 data acquisition and procession modules;
Fig. 4 is the process flow diagram one that indicator and wellhead control unit transmit merit figure;
Fig. 5 is the flowchart 2 that indicator and wellhead control unit transmit merit figure;
Fig. 6 is the flow chart 3 that indicator and wellhead control unit transmit merit figure;
Fig. 7 is the wireless pumping unit controller structure composition frame chart based on WIA-PA;
Wherein, 720 shells, 721I/O input/output module, 722 three-phase electricity acquisition modules; 723 Local Communication Module, 724 processor modules, 725 LCD MODULE, 726 power management modules; 727 data remote interface modules, 728WIA-PA wireless communication module, 729 antenna patchcords, 730 antennas;
Fig. 8 is three-phase electricity acquisition module functional block diagram;
Wherein, 831 three-phase alternating currents, 832 voltage transformer (VT) or divider resistance, 833 current transformers, 834 signal conditioning circuits, 835 power measurement IC, 836 signal isolating chips, 837MCU, 838 power isolation module;
Fig. 9 is single-phase voltage circuit diagram in three-phase electricity acquisition module;
Figure 10 is electric current front-end circuit schematic diagram in three-phase electricity acquisition module.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail.
Rod-pumped well Data Acquisition and Conversion System (DACS) based on WIA-PA intelligent wireless network fully achieves production of hydrocarbons Internet of Things production data and automatically gathers and controlling functions.Automatically the real-time production data gathered is transferred to wellhead control unit RTU by sensing and technology for radio frequency by the data collection station being installed on well head, RTU(REMOTE TERMINAL UNIT) store and send data to Central Control Room by WIA radio network gateway; Meanwhile, the remote control command that Central Control Room issues is issued to wellhead control unit RTU through WIA radio network gateway, and RTU performs control command or is issued to wireless acquisition terminal.
System is made up of real time data wireless acquisition terminal, wellhead control unit and WIA radio network gateway, realize oil pumper to produce real-time parameter data acquisition, store and the central control room transferring to rear, and perform the remote control command of central control room, realize real-time remote monitoring and the data acquisition of production run.
Central Control Room connects WIA radio network gateway, all by WIA wireless communication between WIA radio network gateway, wellhead control unit RTU, data collection station by Ethernet.Data collection station comprises wireless pressure transmitter, wireless temperature transmitter and wireless integral indicator, and the real time data of collection comprises oil pressure, casing pressure, temperature, merit figure.Wellhead control unit RTU realizes electrical parameter collection, Long-distance Control, reception store and the function such as real-time parameter data of forwarding data acquisition terminal, the electrical parameter gathered comprises three-phase voltage, electric current, power factor etc., also comprises the map of current of reaction pump load situation.A WIA gateway can connect and is no more than at most 20 wellhead control unit RTU, and RTU forms Wireless MESH network with between gateway, forms star network between RTU and data collection station.
System data flows to: oil pressure, casing pressure, temperature, electrical quantity (comprising voltage, electric current, power factor etc.) real time data are to fix 10 seconds for the cycle is uploaded to Central Control Room; Merit figure and map of current data are uploaded to Central Control Room according to user configured acquisition interval (30 minutes or 60 minutes).After acquisition interval has configured, whole data acquisition and upload procedure are automatically control, and achieve the automatic collection of real time data.Correspondingly, user can by the general configuration interface monitoring real time data of Central Control Room, and issues remote control command (as long-range start and stop well control system) and inquiry, revises the parameter information of wellhead control unit RTU and wireless acquisition terminal.
Present invention achieves a kind of oil gas Internet of Things and build Bowl station Data Acquisition and Conversion System (DACS), based on WIA-PA wireless network.Native system can realize the Real-Time Monitoring of Oil Well Working, and the Real-time Collection of procedure parameter also transfers to Central Control Room database, for data analysis and Instructing manufacture provide complete data message.Preserve the historical data information of a week by wellhead control unit RTU in simultaneity factor.
Fig. 1 describes the system topological figure of the Data Acquisition and Conversion System (DACS) 10 that the present invention relates to.System is made up of Central Control Room watch-dog, WIA radio network gateway and wellhead equipment, and as shown in fig. 1, Central Control Room comprises the configuration computing machine 11 for showing and control and stores the real-time data base 12 of oil pumper procedure parameter real time data; WIA radio network gateway 15 is connected to well site Industrial Ethernet 14 link by 10/100M self-adaptation Ethernet interface, realizes the downstream transmission of data.Well head collecting unit comprises the wellhead control unit RTU18 of integrated electricity parameter acquisition and gathers wireless data acquisition terminal and the instrument of oil temperature, pressure, merit figure etc., and instrument comprises wireless temperature transmitter, wireless pressure transmitter, wireless integral indicator etc.Wellhead control unit forms star network with between instrument, as instrument 19,20,21 passes through WIA wireless network 17 by respective real-time Data Transmission to wellhead control unit RTU1, each well head is independent star network, and that is instrument 19 is not connected directly to RTU2 by WIA wireless network.Single wellhead control unit RTU can support at most 6 wireless collection equipment.MESH network is formed between well head RTU unit and WIA radio network gateway, well head RTU unit supports wireless routing function, as shown in fig. 1, has barrier to block between RTUm and WIA radio network gateway, directly cannot communicate, but realize data communication by forming multihop network after RTU2 route.Single WIA radio network gateway can support at most 20 wellhead control unit RTU equipment.In system, WIA radio network gateway and wellhead control unit RTU are wired power-supply units, ensure to control reliably, and wireless acquisition terminal equipment is battery supply set, and non-data collection and transmission cycle are in dormant state, to save power consumption, improve battery life.
After system building completes, need on-site parameters that configuration is necessary just can normally networking work, comprising: network parameter, timing parameters, rod-pumped well stroke information are for according to on-the-spot necessary configuration item.
Data Acquisition and Conversion System (DACS) of the present invention mainly achieves the Real-time Collection of data and correctly issuing of user's remote command, namely mainly comprises uplink and downlink two data stream.Wherein the upstream automatic data collection that mainly data collection station has configured according to user is uploaded; Downstream data flow mainly user instruction issues, also comprise user and initiatively read current state information, real time data, equipment configuration parameter information, plant maintenance parameter information etc., reading historical data information operates, and the remote control operation order etc. of rod-pumped well.
Fig. 2 describes native system upstream in detail.After system installation networking completes, wireless acquisition terminal equipment timing starts collection real time data to rear automatically by data acquisition and procession module 27, and process accordingly: as pressure, temperature transmitter carry out sensing numerical evaluation and conversion, indicator calculates current time merit figure according to the load gathered and acceleration signal, and follows data are transferred to wellhead control unit RTU by WIA agreement WIA radio receiving transmitting module by radio receiving transmitting module 26.Wellhead control unit RTU receives data from WIA wireless communication module 23 and is stored to real-time data memory district in RTU, then according to pre-defined rule, data is sent to WIA radio network gateway by WIA radio receiving transmitting module; Meanwhile, RTU also gathers electrical parameter according to timing, is stored to inner real time data district, and is sent to WIA radio network gateway through WIA communication module 23 after calculation process through processor module 24.Real time data timing can be saved to RTU internal history data field by wellhead control unit RTU, so that user reads and analyzes.
Fig. 3 describes native system downstream data flow in detail.As shown in Figure 3, user observes the network state information of current system and each oil pumper working status parameter by the configuration computing machine 11 of Central Control Room, comprises temperature, pressure, merit figure, map of current etc.User carries out Long-distance Control by configuration computing machine, as long-range start and stop well control etc.User issues control command to WIA radio network gateway, and control command is issued to corresponding wellhead control unit RTU, RTU after resolving and resolves control command by WIA radio network gateway, controls rod-pumped well order in this way, then detects current oil well state and perform control command; If configuration order, be then distributed to and be configured end accordingly and carry out parameter modification and configuration.Because system communication is full Wireless mode, user's only configurable equipment parameter and can not carry out network parameter configuration during networking application, avoids cannot networking without equipment after operation.
System devises the application protocol of data integrity according to WIA-PA network feature, WIA radio network gateway, all needs the integrality ensureing data transmission, as shown in Figure 4 between wellhead control unit and indicator.Such as, when transmitting merit diagram data between indicator and wellhead control unit, comprise 0 ~ 21 bag data, after indicator sends 0 number bag, after wait-receiving mode to the reply data bag of RTU, start to send 1 ~ 20 number bag continuously, do not need response; Be sent completely rear transmission 21 number bag, after wait-receiving mode to the reply data bag of RTU, complete this merit figure process of transmitting.If when can not receive the response of 0 or 21 number bags, then as shown in Figure 5, then indicator starts re-transmission, retransmits 1 time at interval of 30s, retransmits 10 times altogether, if still can not receive response, then abandons this transmitting procedure.When 0 ~ 21 number as whole transmission is surrounded by loss, benefit packet procedures is carried out with reference to figure 6, namely after sending 21 number bags, wait for RTU reply data bag, in reply data bag, contain the sequence of data packet number of RTU packet Incomplete information and disappearance, indicator retransmits this deficiency of data bag continuously, and sends 21 number bags again, until receive RTU reply merit diagram data complete after, terminate this transmitting procedure.
Wellhead control unit RTU in the present invention can adopt following proposal:
Based on ARM platform development, adopt 32 bit processors, and integrated electric quantity acquisition function, the data information acquisition of industry spot and the function such as Long-distance Control, fault alarm of field apparatus can be realized, there is the features such as reliability is high, processing speed fast, communication is stable, maintenance cost is low.
Wellhead control unit structure composition frame chart as shown in Figure 7, mainly comprise shell 720 and be arranged at the electron device composition in shell 720, mainly comprise I/O input/output module 721, three-phase electricity acquisition module 722, Local Communication Module 723, processor module 724, liquid crystal display 725, power management module 726, data remote interface module 727 and WIA-PA wireless communication module 728.
I/O input/output module 721 mainly comprises 8 tunnels (AI) analog input interface, 4 tunnels (DI) digital-quantity input interface, 4 tunnels (DO) digital-quantity output interface.
Analog input interface supports the input of 4-20mA signal, for connecting live cable instrument, uses isolating chip to carry out signal isolation between input signal and CPU.
Digital-quantity input interface is used for collection site signal status information, supports 12V/24V input.
Digital-quantity output interface is used to indicate the instruction of lamp state and field control, and field control adopts relay to export.Each road exports support normally opened contact and a normally closed contact, for controlling the start and stop of motor and audio alert switch etc.
Three-phase electricity acquisition module 722 is responsible for the phase current, phase voltage, active power, reactive power, the applied power that gather oil pumper, power factor (PF), the electrical quantitys such as frequency, the big current of motor and large voltage transition are small area analysis and small voltage by mutual inductor, the signal that mutual inductor exports is changed into the signal form that processor can accept to mate by signal conditioning circuit, power measurement IC, to the voltage and current signal analysis and processing of input, calculates corresponding result electric parameter.
Local Communication Module 723 supports 1 RS232,1 RS485,1 10M/100M Ethernet interface, and above interface all supports upgrading RTU program, local display, and local configuring maintenance RTU.
Processor module 724 comprises processor (MCU) and storer, is responsible for the operation controlling whole field apparatus, the data that Storage and Processing itself gathers and the data that other field apparatuss are sent.
Measured signal is become a kind of form can understood for people by LCD MODULE 725, comprises data display, curve, chart etc., for people's field observation and analysis.
Power management module 726 provides the energy needed for operation for oil pumper RTU controller.Power management module makes field apparatus have power supply status Real-Time Monitoring/fault alarm function, is convenient to timely maintenance.The power supply of power management module is generally 24V and powers, by internal electric source conversion chip for each module provides the supply voltage needed separately.Interiorly adopt insulating power supply form with between each unit, prevent the mutual interference between unit.
Data remote interface module 727 comprises supports WIA-PA digital filter, is the GPRS teletransmission interface module of the support GPRS that subsequent expansion designs, supports the teletransmission interface module of WIFI.
WIA wireless communication module 728 is responsible for carrying out radio communication with other instrument of well head, other pumping unit of well mouths RTU controller, WIA gateway, exchange of control information and transmitting-receiving image data.Processor module 724 and WIA wireless communication module 728 carry out two-way communication by serial ports.WIA wireless communication module comprises radio frequency communications circuitry, and some antennas trace comprises on a printed circuit board, and radiofrequency signal is transmitted by PCB antenna seat, Coaxle cable antenna patchcord 729 and antenna 730 by radiofrequency signal.
Electric quantity acquisition function and RTU are achieved integrated design by wellhead control unit, electricity and associate framework as shown in Figure 8 with RTU integrated design.
831 is the three-phase alternating current detected, oil field is the supply line of oil pumper, three-phase electricity acquisition module gathers three-phase alternating current piezoelectric voltage, current signal, voltage is through divider resistance or voltage transformer (VT) 832, electric current is through high precision current transformer 833, large-signal is converted to small-signal, then the conditioning of signal is carried out by signal conditioning circuit 834, signal after power measurement IC835 real-time sampling process conditioning, draw single-phase phase voltage, phase current effective value, applied power, active power, reactive power, power factor, the information such as line frequency, MCU reads the data after metering IC conversion by spi bus.In the present embodiment, power measurement IC adopts cirrus logic single-phase power IC chip, A, B, C phase utilizing three to be respectively used to alternating current, be combined into three phase power collection, isolating chip adopts optocoupler and digital isolator, and signal conditioning circuit comprises resistance, wave filter, amplitude limiter circuit and filtering circuit.
Fig. 9,10 is single-phase voltage in three-phase electricity acquisition module and electric current front-end circuit schematic diagram, and UA is the A phase of three-phase electricity, and RV5 is voltage dependent resistor (VDR), forms the surge protection on line of electric force, reaches anti-lightning strike object.R115, R153, R154, R155, R103 are divider resistance, make the input signal limit volt of VIN+ and VIN-below the maximum input voltage of power measurement IC requirement, be not limited to 5 resistance here, can adopt multiple resistance, increase the stability of system by dividing potential drop.Meanwhile, R103, R104, C60, C61, C66 shaping filter, carries out filtering to signal.
As shown in Figure 10, U23 is current transformer, and big current is transformed to small area analysis, and current transformation is voltage by R118, by selecting resistance value, by the voltage of IINA+ and IINA-limit volt below the maximum input voltage of power measurement IC requirement.R119 and R120 makes signal be transformed to differential signal simultaneously, and bidirectional transient voltage suppressor D27, D28 are composed in series voltage limiter circuit (D27, D28 intermediate node ground connection), by large voltage amplitude limit below the acceptable maximum voltage of chip.R121 and R122 is current-limiting resistance, and meanwhile, R121, R122, C69, C70, C71 form filtering circuit, carry out filtering to signal.
Wellhead control unit is designed to three-phase alternating current electric parameter measurement, is the measurement of three-phase electricity, measures respectively, being added, calculating three-phase combination phase electrical quantity by closing three-phase electricity by three single-phase power metering IC chip portfolios.Have three-phase three-wire system and three-phase four-wire system self-adapting estimation function, stateless indicates, and can directly judge from the mode of connection, three-wire system does not connect N line, and four-wire system connects N line.There is map of current collection, power diagram collection, the uneven alarm of three-phase electricity, the electric quantity acquisition functions such as three-phase electric power open phase alarm.
Electric current conversion is realized by current transformer, and voltage transitions can pass through voltage transformer (VT), also can pass through large electric resistance partial pressure.The precision of current transformer can affect the accuracy of metering, therefore, high precision current transformer selected by current transformer, use voltage transformer (VT) can affect the phase angle of voltage, the design adopts the method for electric resistance partial pressure, the resistance that high precision, power are large, temperature stability is good must be selected at the resistance being transformed to small-signal, and multiple resistant series, ensure the precision measuring switching signal.Whole unit introduces the forceful electric power of electric system; consider power-supply fluctuation and the security of system of power line and load; adopt the voltage dependent resistor (VDR) instantaneous voltage protected because of electric power supply system to suddenly change may to the injury of circuit; when high pressure arrives; the resistance of voltage dependent resistor (VDR) reduces and is shunted by electric current; prevent from being subject to large instantaneous voltage to destroy and interference, and protect responsive electronic package.System also adopts TVS protective current input port to carry out overvoltage protection.
Three-phase electricity acquisition module energize portions power supply is kept apart by power isolation module 38 and other power supplys (power management module 726), and for powering to power measurement IC, signal isolating chip, the present embodiment adopts isolated from power chip.Serial line interface adopts (25M) isolating device isolation at a high speed.Other I/O interfaces adopt common optical coupler isolation, by the forceful electric power of introducing and other parts of RTU are completely isolated comes, protect the security of RTU veneer completely.
RTU supports long-range start and stop well controlling functions, and workflow is: RTU passes through three-phase electricity voltage, current detecting oil pumper running status, if current state is for running, then opening well order does not perform; After Qi Jing, RTU reception Central Control Room opens well order, by DO0 digital output to phonetic alarm, phonetic alarm sends 1min phonic warning, opens oil pumper afterwards by DO1; Stop well, after RTU reception Central Control Room stops well order, close oil pumper by DO2.
Controlling functions realizes relying on number connect test port and the design of three-phase electricity collecting unit, and the input of hardware design upper port realizes 2500V isolating and protecting by special photoelectric isolating chip, and adopts CPU interrupting input to promote the response time; Output port realizes isolating and protecting by photoelectric isolated chip equally, and output port form is that relay exports.
During Qi Jing operation, RTU detects current oil pumper running status after receiving and opening well order, if current state is for running, does not then perform and opens well order, reporting current state for opening well information; If current state for shutting down, then opens well information after reporting 1 minute.Whether complete rear detection current state starts, starts and then reports Qi Jing to complete information, do not start, report and open well failure message.
When stopping well operation, RTU performs and stops well order after receiving and stopping well order.Detect current state whether to shut down, shut down to report and stop well and complete information, do not shut down, report and stop well failure message.
Native system can be installed according to oil well distribution situation by oil recovery factory, and because wellhead control unit and wireless acquisition terminal are all installed near rod-pumped well, WIA radio communication success ratio reaches 99%.Need ensure during networking between many wells that well and the visual range between well and WIA radio network gateway are no more than 300 meters, to ensure having at least a bite well directly can communicate with WIA radio network gateway, and distant well also communicates with WIA radio network gateway by multihop network.Oil field is much more spacious, and oil well disperses, and unattended, the present invention can realize Collection of Remote Real-Time Data and full Wireless networking, meets the demand data of digitizing oilfield construction and the problem of field wiring inconvenience.
Claims (10)
1. based on the rod-pumped well data acquisition control system of wireless network, it is characterized in that: comprise configuration computing machine (11), Industrial Ethernet (14), WIA radio network gateway (13), wellhead control unit (17) and data collection station; Configuration computing machine (11) is connected with WIA radio network gateway (13) by Industrial Ethernet (14); Wellhead control unit (17) is arranged at oil pumping machine well head, carries out radio communication with data collection station, WIA radio network gateway (13).
2. the rod-pumped well data acquisition control system based on wireless network according to claim 1, is characterized in that: described wellhead control unit (17) is for multiple, and each wellhead control unit (17) is arranged in an oil pumping well head; Each wellhead control unit (17) and instrument form star network, also form MESH network with WIA radio network gateway (13).
3. the rod-pumped well data acquisition control system based on wireless network according to claim 1, is characterized in that: described wellhead control unit (17) comprises processor module (724) and connected I/O input/output module (721), three-phase electricity acquisition module (722), Local Communication Module (723), LCD MODULE (725), power management module (726), data remote interface module (727) and WIA wireless communication module (728).
4. the rod-pumped well data acquisition control system based on wireless network according to claim 1, is characterized in that: described three-phase electricity acquisition module (722) adopts resistance, current transformer (833), power measurement IC(835) and signal isolating chip (836); After multiple resistance that is often in series of three-phase alternating current, by wave filter and power measurement IC(835) voltage input channel be connected, often mutually also by voltage dependent resistor (VDR) ground connection; Three current transformers (833) are each passed through three-phase alternating current electric wire, the parallel circuit of a resistance (R118) and two resistance (R119, R120) connected is connected with between the positive-negative output end of each current transformer (833), be connected with amplitude limiter circuit between the two ends of parallel circuit, the two ends of amplitude limiter circuit are by filtering circuit and power measurement IC(835) electric current input channel be connected; Power measurement IC(835) output terminal be connected with processor module (724) through signal isolating chip (836).
5. the rod-pumped well data acquisition control system based on wireless network according to claim 1, is characterized in that: the input end of described wave filter and the parallel circuit being connected with resistance (R103), two electric capacity of connecting (C60, C61) and an electric capacity (C66) between ground; The two ends of electric capacity (C66) respectively with power measurement IC(835) voltage input channel be connected; One end of resistance (R103) ground connection is also connected with another resistance (R104) with between one end of two electric capacity of connecting (C60, C61) ground connection, the node ground connection between the electric capacity (C60, C61) of two series connection.
6. the rod-pumped well data acquisition control system based on wireless network according to claim 1, is characterized in that: described filtering circuit comprises resistance and electric capacity; Two input ends of filtering circuit are respectively by resistance and power measurement IC(835) input end be connected, power measurement IC(35) two input ends between be connected with two electric capacity (C69, C70) of series connection and the parallel circuit of an electric capacity (C71); Node ground connection between two electric capacity (C69, C70) of series connection.
7., based on the rod-pumped well data acquisition control method of wireless network, it is characterized in that comprising the following steps:
The oil pumper data of collection are sent to the wellhead control unit (17) with it in same rod-pumped well by each data collection station, the electrical parameter information of oil pumper data and self collection is sent to WIA radio network gateway (15) by this wellhead control unit (17), carries out data storage simultaneously;
Configuration computing machine (11) receives by Industrial Ethernet (14) network state information and each oil pumper data and electrical parameter information that WIA radio network gateway (15) sends, and sends control command to WIA radio network gateway; Control command is issued to corresponding wellhead control unit (17) by WIA radio network gateway; If control command, wellhead control unit (17) is according to the current rod-pumped well state of control command content detection and perform control command; If configuration order, be then sent to corresponding instrument and carry out parameter modification and configuration.
8. the rod-pumped well data acquisition control method based on wireless network according to claim 7, is characterized in that the wellhead control unit that the oil pumper data of collection are sent to it in same rod-pumped well is specially by described each data collection station: merit diagram data is wirelessly transmitted to the wellhead control unit (17) with it in same rod-pumped well by oil pumper pressure data, wireless indicator by temperature data, wireless pressure transmitter in rod-pumped well by wireless temperature transmitter.
9. the rod-pumped well data acquisition control method based on wireless network according to claim 8, is characterized in that: by merit diagram data, the wellhead control unit be wirelessly transmitted to it in same rod-pumped well comprises the following steps described wireless indicator:
Comprise 0 ~ n bag data when transmitting merit diagram data between indicator and wellhead control unit, after indicator sends 0 number bag, after wait-receiving mode to the reply data bag of wellhead control unit, start to send 1 ~ n-1 number bag continuously, do not need response; Be sent completely rear transmission n number bag, after wait-receiving mode to the reply data bag of wellhead control unit, complete this merit figure process of transmitting;
If when can not receive 0 or the response of n number bag, then indicator starts and retransmits, and retransmits 1 time, retransmit 10 times altogether, if still can not receive response, then abandon this transmitting procedure at interval of 30s;
When 0 ~ n number as whole transmission is surrounded by loss, carry out benefit packet procedures, namely after sending n number bag, wait for wellhead control unit reply data bag, in reply data bag, contain the sequence of data packet number of wellhead control unit packet Incomplete information and disappearance, indicator retransmits this deficiency of data bag continuously, and sends n number bag again, until receive wellhead control unit response merit diagram data complete after, terminate this transmitting procedure.
10. the rod-pumped well data acquisition control method based on wireless network according to claim 7, is characterized in that: described electrical parameter information comprises oil pumper three-phase voltage, three-phase current, power factor (PF), active power, reactive power, applied power, line frequency, active energy, map of current.
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