Study On Automatic Control System For Mixing Petroleum Fracturing Fluid

After exploiting for a period of time, it has been seen that reservoir permeability is lower than previous. As a result there will be with oil but we can not get it. In this situation, we commonly adopt fracturing technique, which injects fracturing fluid into the mine with high displacement and pressure. The fracturing fluid is non-newtonian and viscous, it contains high concentrations of proppant. Then causing cracks and extension at the target zone. When the fracturing fluid gel breaking back, there will be one or more fractures with high conductivity. After increasing the permeability of reservoir, we can achieve the purpose of increasing production. Therefore good quality of fracturing fluid will improve fracturing operations directly, and will certainly affect the production of oil. Fracturing fluid must meet the following requirements: high viscosity, easy to carry proppant(eg: sand), low friction in the pumping process, good at preventing fluid loss, low friction in the pumping process, gel breaking back quickly, economically feasible and will not do harm to formation.This dissertation mainly studies on petroleum fracturing fluid automatic control system according to design parameters of dispensing Station, describes how to design automatic control system, the hardware implementation and software design of the system. We use controller link for networking, and describe communication configuration in detail. On solving powder mixed with water which is the difficulty of getting good quality fracturing fluid, we will use fuzzy control. At the same time, we combine the fuzzy control with PLC. It will overcome the shortcomings of traditional with a large overshoot, give full play to the PLC control of flexible,convenience and adaptable, improve the control of flow of water and powder accuracy .We implement fuzzy control strategy on OMRON CS1G-H PLC, and give a key part of the program.Experimental results show that the system can meet the requirement of the liquid station .In accordance with production needs, the system can quickly configure different concentrations of fracturing fluid with high quality and no "fish eye ".The viscosity of export is over 80% of the lab. It is practical and has some promotional value.