In the application of mechanical and electrical products in oilfield water injection station

1 introduction to compensate for attenuation, formation pressure in the process of oil field production need to use the water injection process to maintain formation pressure oil recovery operations. Water injection pressure is reasonable decision oilfield exploitation and ground pipeline and equipment status of the important parameters. Due to the water injection process and mechanical and electrical equipment in the design of configuration need to adapt to the process condition is complicated, so the water injection process design and mechanical and electrical equipment engineering allowance. These process conditions include: the late development of injection Wells increase; Reservoir formation pressure and oil and gas water distribution constantly changing; Increase or decrease the number of switch well; The influence of the well-flushing and insufficient water supply and so on. Process conditions of uncertainty caused by water injection pressure fluctuations, uneven water injection is unstable, difficult water injection pressure control, brings to the oil field production output and management difficulties. Because of the oil field water injection is difficult to accurately predict and control, considering the need of oil field development, margin usually according to the maximum possible in the oil demand design, especially in water injection system design. Oilfield water injection devices using centrifugal pump motor, power system running in the big light load in the car, often inefficient state. Water injection pressure on pump discharge valve manual control, that is, by the change of pipeline characteristic curve to adjust the displacement of the pump, pump, motor matching is difficult to reach at the optimum condition of the pump operation, low network efficiency, energy loss is as high as 50% above. Frequency conversion constant pressure technology can very effectively the stability of the water injection process and reduce the large margin type fan pump engineering power consumption. The water injection station technical route of constant pressure frequency conversion control system is make full use of existing production facilities, adjusted by the motor speed of water injection equipment, voltage regulator, steady flow for water injection. Soft on soft stop function instead of decompression starting at the same time, make the motor start-stop smoothly, reduce the impact on the power grid and mechanical equipment, will not result in a dramatic change pipe pressure, flow, velocity, without the valve closure, so to prevent cavitation, water hammer and surge is very good, can prolong pipe network, pump and valve maintenance cycle and service life. Form a complete set of perfect automatic control system, build demand information platform, improve the effect of sewage disposal, strengthen supervision and management mechanism, minimize post staff labor intensity, improve the level of the enterprise information management, has the very big economic and social benefits. 2 system composition and the function design control system structure is shown in figure 1. System is divided into two levels, namely, the level and control level, through the man-machine interface ( HMI） Implement process display and control. Figure 1 system structure system core automation equipment selection of mechanical and electronic products. Control level is the key to realize the system function, its main function is to HMI ( The human-computer interaction interface) Level with the hub between the layers. HMI or command set of parameters, to control water injection production process, at the same time to transfer the state to the HMI. Part of the control is integrated in PLC and touch screen. Including DVP - 32EH00R（ CPU units) DVP - 04AD- H（ Analog input module) , simulated DVP - 04DA- H（ Output module) 夹住, A80THTD ( Touch screen) Composition. Level control equipment installed in the control room electric control cabinet. DVP - in PLC CPU module 32 eh00r it with a RS232 and RS485 communication interface, DOP - A80THTD touch screen with a RS232 interface and a USB interface. Touch screen through RS232 serial port communication with controller. The basis of field level is to realize the system function. On-site by intelligent integration of pressure transmitter and transducer. Intelligent integration choose honeywell pressure transmitter, pressure transmitter frequency converter selection of VFDS series inverter. Field water injection machine 1 units of 160 kw, 75 kw (2 Spare 1) Choose 160 kw VFDS, so the frequency converter F43a 1600 a and 75 kw VFDS - 750 f43a composition yituo one and went on two schemes respectively, see figure 2. Use 1 two PLC controller control frequency converter drag 2 motor frequency conversion water injection pressure water injection. Field level control using shielded cable connection, the integration of intelligent pressure transmitter converts the pressure signal to 4 - 20 ma DVP - signal input to the analog input module 04AD- H, controller of PLC output control quantity DVP - through the analog output module 04AD- Is converted to a 4 - H 20 ma signal input two frequency converter, the realization of constant pressure water injection of two water injection motor frequency conversion control. Three technological process and control system design principle of transverse pressure water injection process automation system is shown in figure 2. System consists of three kinds of control mode: run automatically, manually variable frequency operation and power frequency operation. Figure 2 principle of automatic control system in figure 3. 1 automatically run the system automatically start the first frequency converter, using PID to control the water injection pressure of injection pump, if the pump output pressure can not meet the requirement of the pressure, the system will automatically start the second frequency converter in order to meet the pressure requirements. 3. 2 manual variable-frequency operation button on the control panel in manual mode can be individually start frequency converter, the flexible control inverter output. Meet the requirements of control under complex conditions. 3. 3 start running power frequency inverter motor running to the work frequency, using the contactor switch motor from converter, input power frequency operation, as shown in figure 2. High-power converter ACTS as a motor soft starter. Through the above three kinds of control mode, can guarantee the normal operation of the water injection machine, to meet the requirements of continuous production.
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