Study On The Influences Of Impeller And Static Impeller Blades Inclination On The Performance Of The Oil-gas Mixed Pump

The main components of primary petroleum are oil and gas.Multiphase gathering and transportation technology is an important mean for the exploitation of petroleum and associated natural gas.It has attracted widespread attention due to its short development cycle,low cost,and high recovery efficiency.The oil-gas mixed,as the core equipment of gathering technology,its pumping capacity and transport efficiency will directly affect the oil recovery.In order to improve the efficiency of the oil-gas mixed pump,this present paper takes the YQH-100 type three stage spiral axial flow pump as the research object.Based on the Mixture two phases flow theory and numerical calculation methods.Study on the blades tilt angle of the moving and stationary blades are influences on the oil-gas mixed pump performance,gas phase distribution and pressure field in different conditions.The contents and results of this study are as follows:1.The influences of rotor(impeller)inclination angle on the performance of the oil-gas mixed pump.There are five schemes with different inclination angle of-10°,-8°,-4°,0°and 4°,The blade perpendicular to the hub is 0°,which is the original model.The angle between the blades and the hub is a sharp angle,which is called the forward leaning blade;conversely,it is called the back leaning blade.The convective field is simulated under the different GVF and flow rates.Then this study analyzed the variation curves of the pressure and efficiency with the air content rates under each schemes,the pressure field and gas distribution inside the blade runners.The results show that the increase of pressure decreases with the change of inclination angle and the best angle is 0 °.The efficiency increases first and then decreases.The efficiency of back inclination angle 4°scheme is the highest and the efficiency of back inclination angle 8°scheme is the lowest.With the increase of the back inclination angle,the air mass moves radially along the blades height direction.In addition,with the increase of the reclining angle,the high gas-bearing area at the back of the blades gradually decreases.2.The influences of static impeller(stator)inclination angle on the performance of the oil-gas mixed pump.Based on the above research,the impeller inclination blades of 4°and 0°are determined.There are four schemes with different guide vane inclination angle of-8°,-4°,0°,4°.The CFD numerical simulations are carried out under various GVF and flows.The distribution of pressure and gas phase on the cylindrical surface of stationary pump is analyzed,and the influences of static blades inclination on the internal flow of oil-gas mixed pump are studied.Finally the matching problems of the inclination angle between the impeller and stationary blades are discussed.When the static blades of the impeller are inclined to-4°and the static vane is tilted to 0°,the capacity of the diffuser is better,and the efficiency of the multiphase pump is higher.When the impeller blades are tilted by 0°,and the static vane blades are tilted by 0 °,the oil-gas mixed pump have the best boosting effects.The high gas-bearing area in the guide vane is less and the gas phase distribution is more uniform when the static vane is inclined to 0°.When the static blades are inclined to 0 °,comparing the two schemes of impeller blade backward tilting 4°and impeller blade tilting 0°,the efficiency of impeller blade backward tilting 4°mixed transportation pump is the highest and the gas distribution in it is better,then the matching relationship is better.