Running in series When the transmission distance is far, the pump pressure is high, you can use more than one series operation. Due to the compressibility of the gas, the pump flow at all levels should be based on the ratio of oil to gas, the pressure of the manifold, the pressure of the mixed pipeline, and the pressure distribution among the pumps. In order to coordinate all levels of pumps can work properly, we must take the pressure of the pressure points automatically adjust the pump speed, adjust the pump flow, to achieve the purpose of high-pressure oil and gas mixture. Mixed pressure pump problems Because the mixed transmission system, mixed pump suction chamber not only to withstand oil well pipe back pressure, may also have to withstand the outlet pressure or pressure on the previous pump. When the delivery is switched by pipeline delivery to mixed delivery pump or delivered by mixed delivery pump to direct delivery, the suction and delivery ends of the pump are exposed to the pressure of the oil and gas mixing line when the valve is switched over. Therefore, the suction chamber must be able to have sufficient pressure capacity, usually to withstand the discharge pressure. Anti-reversal hybrid pump problem Mixed pump operation in the process system, the pump into the pipeline between a certain pressure. When the pump stop valve is not closed, there may be a reversal of the pump. Because most of the fluid in the oil-gas mixed transportation is gas, the flow resistance is small and the flow velocity is fast, which causes the pump to reverse over the rated speed, causing a speeding phenomenon and being prone to accidents. In the design process, should take appropriate measures to prevent this from happening. Can be installed in the pump outlet check valve to prevent reverse flow of fluid, this method is the most simple and practical and reliable; can also be used with brake motor. Prevent the over-pressure operation of single-screw pump General single-screw pump delivery of the nature of the media, the state is more complex, may cause congestion in the pipeline. Because the single screw pump is a positive displacement pump, when the blockage or human error, it will cause the pump overpressure, it is easy to damage its components. To prevent damage to the pump, a safety valve must be fitted between the discharge pipe of the pump and the suction pipe. Pressure outlet can also be installed in the pipeline relay, the pump exceeds the rated pressure automatically stop the pump. In the mixed transmission system, two pumps are connected in parallel and the piping is symmetrically arranged; the pressure transmission signal of the inlet pipeline is sent to the electric control cabinet, and the pump displacement is regulated by the frequency converter to control the pump inlet constant pressure; the pump outlet pressure relay signal is sent To the control cabinet to achieve overpressure automatic alarm, automatic pump stop; pump outlet single-flow valve to prevent media backflow and mixed pump reverse role. Pump to ensure uninterrupted pump before the pump, the buffer tank to play a separate role, the separation of natural gas can also be used as heating furnace fuel. In the actual design of single screw pump oil and gas mixing process, according to the specific circumstances of the oil region, a comprehensive analysis of oil and gas mixing capacity, oil and gas production, oil and gas ratio, oil recovery, transmission distance and many other factors, many investigations and studies Comparison of programs, select the appropriate hybrid pump type, to develop a reasonable process layout, in order to achieve safe, scientific, reliable and economical operation of oil and gas mixed transportation.