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we will take a deeper look at more details of the movable barrel sand control oil well pump. 1. Detailed explanation of the working principle of the movable barrel sand control oil well pump: During the working process of the movable barrel sand control oil well pump, during the upstroke, the sucker rod will move the movable barrel sand control oil well pump upward, causing the oil outlet valve to close. As the space in the pump barrel cavity gradually increases, the pressure begins to drop. At this time, the liquid in the well will push the oil inlet valve open and smoothly enter the pump cavity. During the downstroke, the pump barrel moves downward, and the pressure in the pump increases accordingly. The oil outlet valve opens under the action of pressure, while the oil inlet valve closes. In this way, the liquid in the pump is smoothly discharged and flows into the oil pipe.

Hydraulic feedback sucker rod pump: 1. Working principle of hydraulic feedback sucker rod pump: Hydraulic feedback sucker rod pump is composed of two pumps with different pump diameters connected in series, and the center tube connects the upper and lower plungers into one. During the upstroke, the plunger assembly moves upward, the volume of the annular cavity between the upper plunger and the lower pump barrel increases, the pressure decreases, the oil inlet valve opens, and the oil outlet valve closes under the pressure of the liquid column in the oil pipe, and the well fluid enters the annular cavity through the oil inlet/discharge joint. During the downstroke, the plunger assembly moves downward, the volume of the annular cavity between the upper plunger and the lower pump barrel decreases, the pressure increases, and the well fluid in the annular cavity closes the oil inlet valve through the oil inlet/discharge joint, the oil outlet valve opens, and is discharged into the oil pipe through the inner hole channel of the upper plunger. At this time, since the oil inlet valve is closed, the pressure of the liquid column in the oil pipe is applied to the lower plunger through the oil inlet valve (hydraulic feedback force), forcing the plunger to overcome the friction resistance of the heavy oil and move downward.