Patent RU-2749586-C1 (RU)
Title: Method for pumping formation fluid with high content of gas and abrasive particles and submersible installation with vane pump and gas separator for its implementation
Inventor: TRULEV ALEKSEJ VLADIMIROVICH
IPC: E21B43/38
Filed: 2020-11-23
Granted: 2021-06-15
Abstract: FIELD: formation fluid pumping. 
     SUBSTANCE: inventions group relates to a method for fluid formation fluid with a high content of gas and abrasive particles and a submersible installation with a vane pump and a gas separator for implementing the method. The method for pumping formation fluid with a high content of gas and abrasive particles includes supplying a gas-liquid mixture to a gas separator, increasing the pressure of the gas-liquid mixture in the gas separator screw, swirling the flow of the gas-liquid mixture. Separation of the flow of the gas-liquid mixture with the subsequent removal of most of the separated gas into the annulus and supply of the degassed liquid to the vane pump, followed by compression and dissolution of the remaining gas. Formation in the gas separator of two areas, separated by a separating sleeve: the area of supply of the gas-liquid mixture and the area of separation. A screw is installed on the shaft in the area of the gas-liquid mixture supply. In the separation area there is an axle wheel. The pressure at the entrance to the separation area and the pressure of the gas-liquid mixture on the axial wheel are at least 10% higher than the pressure at the outlet from the supply area and the pressure of the gas-liquid mixture on the screw, respectively. For each axial wheel and vane pump guide vanes in the flow path, the flow of the gas-liquid mixture is dispersed. The maximum pressure gradient in the blade cascade of the stage exceeds the average by no more than 10%, while the difference in the velocities of the liquid and gas phases is no more than 15%. The submersible installation includes a vane pump, a gas separator, an electric motor, each stage of a vane pump includes an impeller and a guide vane, between the driving disc of the impeller and the lower disc of the guide vane, an area is formed that is closed on the inner side. The gas separator contains housing, a protective sleeve installed in the housing. A base with holes, a screw, an axial wheel, a head with channels for the passage of the separated liquid into the vane pump and holes for the gas outlet into the annular space, are sequentially mounted on the shaft along the flow of the gas-liquid mixture. A separator sleeve is installed between the auger and the axle wheel in a protective sleeve. The separating sleeve includes a confuser and a diffuser section. On the confuser section of the separating sleeve, blades are made, the angle of inclination of which increases from inlet to outlet. The inner diameter of the thermowell is at least 12% smaller than the inner diameter of the thermowell. The angle of the blades at the exit from the axle wheel is at least 20% higher than at the exit from the screw, the impellers and guide vanes of the vane pump are made using sand casting technology, the difference between the diameters of the driving and lower disks of the impeller and the guide vanes does not exceed 5%. 
     EFFECT: increasing reliability and efficiency of the unit with a gas separator and a vane pump. 
     8 cl, 5 dwg