Study on Equivalent Viscous Damping Coefficient of Sucker Rod Based on the Principle of Equal Friction Loss

Table 1

Main parameters and calculated results of .

			/(N•s/m^2)	Pump setting depth/m	well depth/m
/mm	/mm	/mm
8	16	25.3	0.033	1148	1239	0.3845	0.4085	0.3477
9.5	16	25.3	0.028	1415	1504	0.3604	0.3807	0.2984
9.5	16	25.3	0.022	1836	1963	0.3221	0.3689	0.2345
9.5	19	31	0.029	1168	1253	0.3708	0.4605	0.3091
9.5	19	31	0.023	1724	1804	0.3369	0.3653	0.2451

Notes: is the value calculated by measured parameters; is the value calculated by (55); is the value calculated by Zhang Qi formula.