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Despite the massive use of dynamograms to identify possible faults in downhole sucker rod pumps (DSRPs), frequent analysis of the deviation of the pumping mode from the optimal mode, and attempts to determine the column load of the sucker rod (SR), little if any attention had been given before this study to oscillation processes that significantly affect the column’s durability. In view of the expedience of considering the SR column as an oscillation model, the objective of the study consisted in developing a method of determining the column oscillation damping ratio on the basis of the obtained DSRP dynamograms. The study considered the nature of the dissipative forces and their impact on the character of the SR column damping. It has proven a reasonable possibility of studying the intensity of oscillations’ damping in defferent sections of the dynamograms. This was done by analysing real estuarine and abyssal dynamograms and approximation of oscillogramed sections in the form of periodic changes in the load factor of oscillations’ damping for particular column layouts. The developed method can be applied to analysing dynamograms of a particular well, whereas the determined damping ratios facilitate assessment of the SR column dynamism and establishment of the best modes of the DSRP operation to prevent resonance under actual operating conditions.

An experimental and theoretical method of calculating the damping ratio of the sucker rod column oscillation