The flow field in deep well submersible pump is the key to improve the performance of deep well pump

Studying the flow field in deep well submersible pump is the key to improve the performance of deep well pump.

With the PIV technology, LDV technology and ultrasonic technology matures, people can already use these advanced flow field test technology without disturbing the flow field for high-precision measurement.

In this paper, we use PIV (Particle Image Velocimetry) to study the flow field of deep well pump in Canada. The main content of this paper is to measure the distribution of the flow field in the pump at different flow rates, Similarities and Differences of Flow Field in Deep Well Pumps for Single - phase and Miscible.

Test procedure:

The industrial white oil with density and viscosity similar to that of crude oil was used as the test medium, and GDX501 polystyrene pellets with density close to that of white oil were used as tracer particles. A 10-W neon laser generator and its corresponding light path system were used as the illumination source of the PIV camera, and the PIV images were recorded by video or photographic method. For different working conditions, the PIV images of deep well pump cylinder, pump valve, plunger and other parts were recorded and photographed under single-phase and gas-liquid two-phase medium, respectively, in order to prepare for further analysis and processing.

Experimental results and analysis:

Because of the research on the flow field of the deep well pump fixed valve has been the corresponding research results, and gas-liquid two-phase flow PIV image processing program is imperfect, so here focused on the analysis of single-phase fluid flow medium when the deep well pump valve and column Plug the flow field.

Movement law of deep well pump

In the experiment, it is found that the movement law of the deep well pump valve is not exactly the same as it is known to people. Its motion is accompanied by two kinds of rotary motion besides the vertical linear motion. When the piston moving speed is small, the valve ball around the horizontal axis up and down rotation; when the piston movement speed is greater, the ball around the vertical axis of the horizontal rotation and along the valve seat hole hole angle of the central axis of the valve seat orbital revolution. The rotation speed of the piston and the speed of movement of the plunger, the greater the speed of movement of the plunger, the greater the rotation speed of the valve ball. The special form of movement of the ball is mainly related to the particularity of the valve ball, the seat structure and the impact of the fluid. Deep well pump valve is a spherical valve, when the fluid flows around it, in its rear will be the phenomenon of the detachment of the surface layer, while producing a lateral excitation. Due to the symmetry of the ball, this lateral excit- ing force will move around the "equator" of the valve ball so that the ball does not always lie on the axis of the valve seat bore, but rather deviates a distance and abuts against the valve seat Corner rotation, this is the "revolution" phenomenon.

In addition, due to fluid flow instability and the deviation of the valve ball caused by fluid flow relative to the ball valve asymmetry, the ball will have some flexibility, so that the lateral force is not acting on the core, but in the horizontal plane There is a certain degree of eccentricity, so that the ball in the horizontal plane there is a rotation, the "rotation" phenomenon. The above conclusion is obtained in the case of pure liquid. In the gas-liquid mixed-phase flow, due to the presence of bubbles, the flow field disturbance is more intense, and bubbles on the ball has a certain impact, this time the ball movement is more complex, in addition to rotating movement, there are up and down violent beating