1 Overview

The distribution of single wells in Tahe Oilfield is relatively scattered, between single wells and single wells, and between single wells and counting stations. The distance is close to 1 km, and the far distance is more than 10 km, resulting in workers. The patrol wells have high labor intensity, waste of time, high vehicle wear, and high operating costs. Later, through the automation reform, the RTU monitoring system was set up at the wellhead of a single well, which reduced the above-mentioned operational contradictions and reduced labor intensity and operation and maintenance costs of workers.

2, system description

The construction of digital oilfields and improvement of the automation level in project construction and operation have been the current trend and consensus of Tahe Oilfield development. On the one hand, this can increase the high reliability in the operation and maintenance process, reduce the labor intensity of workers, and reduce the production process. In the operation and maintenance costs. At present, the Tahe Oilfield's automation control adopts three-level control, and the whole system is divided into three levels, namely, the first level: the control management level (main control room) is set in the transfer station or the gas field processing station, and the second level is the process control level. (Data acquisition equipment RTU) is installed in the cabinet at the wellhead of the single well, and the third level is the on-site control level, including on-site detection instruments and control valves. The system structure is as follows:

The oil wells in Tahe Oilfield have been mixed with dilute oil recovery modes. The collected data signals include: oil pressure, casing pressure, back pressure, oil temperature, mixed oil flow, and mixed oil pressure signals; RTU data acquisition and remote control are not used. Previously, on-duty staff needed to record various data for each well with a pen at the wellhead every day. The flow of the mixed oil was adjusted manually at the wellhead. The result of this model is that it increases the labor intensity of workers, raises operating costs, and manual adjustments make it difficult to adjust the flow to exact requirements. For the above production and operation conditions, I have established a RTU system with a wellhead to collect and store data for each detection point, and at the same time be able to remotely execute the communication instructions issued by the primary control system to adjust the flow of the doped flowmeter. The on-duty personnel in the control room shall give a communication instruction according to the need of the individual wells to be mixed with rare substances, and reach the wellhead RTU system through the communication link to achieve remote adjustment and control. The RTU system selected the T9 series RTU system from Beijing TengChan Technology. The RTU system has powerful communication capabilities and can support RS232, RS485, RJ45 and other interfaces to meet the needs of a variety of on-site selections. The communication protocol supports various communication protocols such as MODBUS/TCP/IP, which facilitates communication with other systems. The T9 series RTU adopts a modular design. The module integrates a CPU controller and various IO interfaces. It takes up less space and is easy to install. At the beginning of the communication system, wireless communication was adopted for digital radio stations. However, Tahe Oilfield suffered from severe weather and often experienced dust storms. When the dust storm occurs, the wireless signal will be interrupted. The later communication system adopts the wired communication mode of laying the optical cable. The photoelectric conversion device is set at the optical cable end to realize the conversion of the photoelectric signal. Optical cable communication has high reliability and communication is more smooth.

1. Application and Prospect of RTU System in Tahe Oilfield

The RTU system has a wide range of applications in the Tahe Oilfield. There are corresponding successful applications in the Block 1 and District 2 of the Tahe Oilfield, and normal applications have been achieved in unattended metrology and wellheads. The successful application of RTU at wellheads and unattended stations has improved production efficiency, reduced the labor intensity and operating costs of workers, and has played a role in reducing staff and increasing efficiency. Therefore, it has broad application prospects.

However, some problems are also exposed in the operation because the automation system is an emerging industrial control system. The operators are less able to familiarize themselves with the technology and have a strong dependence on the supplier of the equipment and later maintenance. It is believed that with the control system, The wide application of the corresponding professional training prospects will be even broader.

2. Concluding remarks

RTU's application in Tahe Oilfield has both successful and failed lessons. The key issue is that when selecting a model, it can fully consider the local bad weather conditions and the later operation and maintenance. Only under the premise of ensuring the smooth communication, efforts to improve the technical level of operation and maintenance personnel can really make the RTU system play its due role, reduce staff and increase efficiency, increase labor efficiency, and build Tahe Oilfield into a truly digital oil field.