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PREDICTING THE RELIABILITY OF A TUBING STRING DURING OPERATION A PULSED DOWNHOLE DEVICE

To study the unsteady fluid motion in a tubing string, when it is pumped, the classical equation of hydraulic impact is solved at the first stage. The solution was carried out by separating the variables taking into account all real initial and boundary conditions. The problem of distributing the hydraulic impact of a viscous liquid in a tubing string from the operation of impulse devices at the bottom of a well as a homogeneous system in which all processes occurring during fluid injection are interrelated. As a result, expressions were obtained for determining the velocity of the fluid and the amplitude of the change in the fluid pressure in any arbitrary section of the liquid column inside the tubing string, over which graphical dependencies are plotted in relative values for different pipe diameters. The results obtained make it possible to predict the reliability of the pipe string for pulsed non-stationary injection of liquid under pressure.