Problem of efficient utilization of low-pressure gas and effective pumping of gas-liquid mixtures is one of the unsolved environmental problems in petroleum industry. This is because the problem of development of effective pumping and compressor equipment for gas and gas-liquid mixtures in field conditions has not been fully solved. The direction of work on the joint use of inkjet technology and power pumps that allow the transfer of multiphase media is very promising. Application of centrifugal pumps with two output channels allow to increase the efficiency of the working process, and the practical interest in such hydraulic machines has not weakened for dozens of years. A multi-stage centrifugal pump with two output channels, assigned to a group of dual-flow pumps, allows to create a two-chamber jet pump-compressor unit. In two-chamber pump-and-compressor unit the pumped gas-liquid mixture is compressed in series in two working chambers: in the working chamber of the jet device and in the working chamber of a multi-stage centrifugal pump. In the course of the research work, calculation algorithms have been developed that make it possible to relate the theory of jet devices to the theory of centrifugal and rotary pumps, as applied to two-chamber pump-compressor units. It is shown that the characteristics of the centrifugal pump under study cannot be represented in the form of a simple linear relationship between the pump flow and pressure. Instead of a line on the coordinate plane, it is required to represent two plane figures graphically. One of the figures allows us to characterize the flow parameters in the first output channel of the pump, and the second one allows us to characterize the flow parameters in the second output channel of the pump. In this case, a definite flow regime in the first output channel of the pump corresponds to a strictly defined flow regime in the second output channel of the pump. In the study along with a centrifugal multi-stage pump, new designs of volume-type pumps that can operate at high rotor speed are considered. The possibility of assembling a multi-stage pump, where sections of a dynamic-type pump and a volume-type pump sections are sequentially mounted on one shaft is also considered. Prospects for the use of two-chamber pump-compressor units are also associated with the development of new technologies for the production of high-viscosity oil, where the issues of creating efficient thermal generators and efficient pumping systems remain very topical.
Acknowledgement. The works are carried out with the financial support of the state represented by the Ministry of Education and Science of Russia. The unique identifier of the work (project) is RFMEFI57717X0259.
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