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RTU Data Acquisition Scheme for Pumping Unit

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RTU Data Acquisition Scheme for Pumping Unit

  • Categories:Oil
  • Author:
  • Origin:
  • Time of issue:2020-03-31 10:48
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(Summary description)Previously, data collection in oil wells in my country was basically done manually. Oil producers must go to the site to collect wellhead production data such as the dynamometer graph, balance, oil jacket pressure, oil temperature, and fluid production. The labor intensity of workers is high, and the accuracy and reliability of the data completely depend on the work responsibility of the oil extraction workers.

RTU Data Acquisition Scheme for Pumping Unit

(Summary description)Previously, data collection in oil wells in my country was basically done manually. Oil producers must go to the site to collect wellhead production data such as the dynamometer graph, balance, oil jacket pressure, oil temperature, and fluid production. The labor intensity of workers is high, and the accuracy and reliability of the data completely depend on the work responsibility of the oil extraction workers.

  • Categories:Oil
  • Author:
  • Origin:
  • Time of issue:2020-03-31 10:48
  • Views:
Information

Previously, data collection in oil wells in my country was basically done manually. Oil producers must go to the site to collect wellhead production data such as the dynamometer graph, balance, oil jacket pressure, oil temperature, and fluid production. The labor intensity of workers is high, and the accuracy and reliability of the data completely depend on the work responsibility of the oil extraction workers. Production parameters of oil production wells are often unavailable due to weather changes and transportation, which seriously affects the automatic management of oil wells.

 

Nanda Automation Technology Co., Ltd. provides NA RTU products for an oil production area in an oil field, which can monitor oil well parameters current, voltage, wellhead temperature, pressure, dynamometer graph, current graph, power graph, etc. in real time, and can also diagnose faults in real time, find faults in time and report to the police. It can remotely control the start and stop of the pumping unit. Query the operating parameters of the oil well at any time and realize remote data transmission.

 

 


 

Working principle of wellhead RTU

 

The wellhead RTU is the core unit of the wellhead monitoring system, equipped with external motor frequency converters, smart meters, wireless load displacement sensors, temperature, pressure sensors and other equipment.

 

The RTU can control the start and stop of the wellhead motor and the operating frequency through the frequency converter, thereby adjusting the stroke of the wellhead. Smart meters collect data such as electricity consumption, voltage, current, active (reactive) power, and power factor on site. The wireless integrated dynamometer is a dynamometer chart that reflects the changing law of the suspended load of the pumping unit with its displacement. The dynamometer graph is the closed curve measured by the dynamometer in one pumping cycle of the pumping unit. According to the dynamometer diagram, the current working condition of the pumping unit can be analyzed. The pressure and temperature sensor detects the oil pressure and temperature in the output pipe.

 

RTU's communication output interface has Ethernet, serial port. In the area where the wellhead is relatively dense, the wireless bridge LAN communication method is mostly used, while in the area where the wellhead is scattered, the DTU method can be used to form a GPRS network.

 

 


 

Realization of RTU monitoring system

The realization of the wellhead RTU monitoring system must solve the following common problems in addition to the common collection and data transmission problems in the monitoring system:

 

1. The choice of NARTU platform

 

From the working principle of the wellhead RTU, it can be seen that the internal software function of the RTU is relatively complicated, there are many software modules, and the multi-thread mode is required. IEC-104 protocol thread for SCADA system communication, ZigBee peripheral device communication thread, inverter communication thread, smart meter communication thread, analog input collection thread, main thread (system configuration, sub-thread establishment, failure analysis, historical data storage),terminal debugging configuration thread.

 

Therefore, NARTU's hardware platform uses an ARM9-based operating system that can support Linux multitasking and multithreading. Platform external interface needs to be integrated: Zigbee interface, Ethernet interface, 1 RS232 interface, 3 RS485 interface, DI input, DI output, AI input, VI input, etc.

 

 

2. The problem of acquisition synchronization of indicator graph

 

NARTU supports 3 dynamometer acquisition modes: wireless load and displacement integrated mode, wireless load + wireless angular displacement mode, wireless load + stroke switch mode. In the process of collecting the dynamometer graph, in addition to collecting the dynamometer graph curve, it is also necessary to collect the power curve, such as current curve and power curve. This needs to solve the problem of synchronization of dynamometer graph acquisition and electric parameter acquisition. First, the power module needs to have the ability to collect the curve within the stroke period, and then the RTU coordinates and collects synchronously.

 

When the RTU receives the general data of the integrated load sensor, it sends the power chart and power chart acquisition commands to the sensor and power module. The command includes information such as synchronization time, acquisition points, and stroke period. After receiving the power chart or power chart acquisition command, the meter starts to count down. After the countdown is completed, the power chart or the power chart is collected, thereby synchronizing the collection of the power chart and the power chart.

 

After the sensor power chart collection is completed, the power chart data block is immediately transferred to the RTU. During the transmission of power graph data, the RTU responds to each set of data. If there is no response, the meter will retransmit the set of data, the number of retransmissions is 3 times. After the power chart data transfer is completed, the RTU sends a power chart data read command to enter the power chart data transfer process similar to the power chart.

 

 

3. Application environment adaptability

When considering the environmental factors of the oil field, the temperature, humidity, dust and corrosion of the well site are mainly considered, which affect the hardware of the oil well monitoring system. For example, in desert oil fields in northwestern my country, the temperature in summer is particularly high, the temperature difference between day and night is very large, the dust content in the air is high, and the salt and alkali content of groundwater is high. Therefore, in order to realize the unattended working state of the work site, the RTU design must have environmental adaptability such as high temperature resistance, low temperature resistance, corrosion resistance, and dust resistance. The electronic chip used in the hardware platform of RTU must be industrial grade (-40℃~85℃), and relevant environmental testing experiments must be completed during the RTU design and production process.

 

 


 

The application of NA RTU in oil field wellhead

Qingdong 5 New District is located in the extremely shallow sea area west of Laizhou Bay, Dongying District, Dongying City. It consists of an 8.48-kilometer sea route from the east tide-proof embankment to the artificial island and an artificial island. The structure is located in the south of the western slope belt of Qingdong Sag. All belt pumping units are used on the artificial island, and an RTU control cabinet is installed at each wellhead. The ergometer acquisition scheme of the wellhead adopts wireless load + stroke switch mode. The RTU controls the motor through the frequency converter, the on-site stroke frequency is about 0.5 times/minute, and the stroke is about 6 meters.

  

RTU机柜图

  Figure 1 RTU cabinet diagram

 

 

  

 

 

 Figure 2 Power chart acquisition diagram

 

In the project of oil well remote metering system, due to the use of distributed control system and RTU technology, this system has realized unattended monitoring automation of the pumping unit well. Especially after the application of RTU technology, production and management are automated, so that through the calculation and analysis of the various parameters of the pumping well well collected, the data required by the user is obtained, which improves the safety and automation level of the entire metering system . This reduces the labor intensity of worker inspections and extends the operating cycle of equipment.

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Time of issue:2020-06-24 00:00:00

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Time of issue:2020-06-24 00:00:00

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Time of issue:2020-06-22 00:00:00

Nanda Automation Technology Jiangsu Co., Ltd.     Record number: 苏ICP备090423423号-1