Dynamic Behavior of the Polished Rod for the Coalbed Methane Pumping Installations | Oil & Gas Science and Technology

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Table 2

The results of dynamic hanging loads on polished rod for the different phases of CBM producing process in Zhengzhuang and Sanjiao coalfield.

	Zhengzhuang coalfield					Sanjiao coalfield
Stroke	Static loadF_J (kN)	Inertial load F_Q (kN)	Vibration load F_V (kN)	Friction load F_M (kN)	Total load F (kN)	Static load F_J (kN)	Inertial load F_Q (kN)	Vibration load F_V (kN)	Friction load F_M (kN)	Total load F (kN)
Upstroke	24.05	2.75	1.43	0.91	29.14	22.42	2.17	1.76	1.11	27.46
	24.29	1.35	0.96	0.90	27.50	24.24	1.14	1.20	1.10	27.69
	22.53	0.56	0.54	0.90	24.53	26.67	0.39	0.82	1.09	28.98
	23.33	0.11	0.24	0.89	24.57	27.31	0.16	0.59	1.09	29.16
Downstroke	14.52	1.39	1.43	1.34	10.36	13.50	1.03	1.76	1.45	9.26
	14.52	0.69	0.96	1.11	11.76	13.50	0.54	1.20	1.28	10.48
	14.52	0.28	0.54	0.99	12.71	13.50	0.19	0.82	1.17	11.32
	14.52	0.06	0.24	0.91	13.31	13.50	0.08	0.59	1.13	11.71

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