Fault Diagnosis Method and Application of ESP Well Based on SPC Rules and Real-Time Data Fusion

Table 9

Diagnosis results of working conditions.

Well name	Working condition type	5 minutes	60 minutes	1440 minutes	Max	Diagnostic result
well_001	Normal	0.65	0.50	0.60	0.65	Tubing leakage
	Shaft breakage	0.70	0.55	0.90	0.90
	Tubing leakage	0.85	0.55	1.00	1.00
	Pump plugging	0.75	0.40	0.65	0.75
	Perforation plugging	0.60	0.40	0.50	0.60
	Water-cut rise	0.25	0.15	0.25	0.25
	Wellhead shut-in	0.10	0.15	0.20	0.15
	Reservoir pressure increase	0.40	0.45	0.45	0.45
	Gas influence	0.35	025	0.85	0.85
	Pump wear	0.75	0.55	0.55	0.75
	Frequency increase	0.05	0.05	0.05	0.05
	Choke stab	0.00	0.05	0.05	0.05
	Pump reverse	0.50	0.70	0.70	0.70
	Tubing plugged	0.75	0.65	0.75	0.75
well_003	Normal	0.70	0.50	0.25	0.70	Shaft breakage
	Shaft breakage	0.90	0.90	0.90	0.90
	Tubing leakage	0.65	0.75	0.85	0.85
	Pump plugging	0.85	0.65	0.80	0.85
	Perforation plugging	0.50	0.40	0.60	0.60
	Water-cut rise	0.55	0.40	0.45	0.55
	Wellhead shut-in	0.35	0.15	0.35	0.35
	Reservoir pressure increase	0.50	0.35	0.40	0.50
	Gas influence	0.80	0.75	0.80	0.80
	Pump wear	0.65	0.55	0.75	0.75
	Frequency increase	0.15	0.05	0.05	0.15
	Choke stab	0.10	0.00	0.00	0.10
	Pump reverse	0.40	0.50	0.80	0.80
	Tubing plugged	0.50	0.55	0.80	0.80
well_004	Normal	0.70	0.60	0.10	0.70	Gas influence
	Shaft breakage	0.45	0.55	0.70	0.70
	Tubing leakage	0.30	0.40	0.75	0.75
	Pump plugging	0.85	0.70	0.75	0.85
	Perforation plugging	0.25	0.65	0.55	0.65
	Water-cut rise	0.30	0.60	0.50	0.60
	Wellhead shut-in	0.20	0.20	0.20	0.20
	Reservoir pressure increase	0.55	0.50	0.50	0.55
	Gas influence	0.70	1.00	1.00	1.00
	Pump wear	0.35	0.75	0.65	0.75
	Frequency increase	0.05	0.05	0.05	0.05
	Choke stab	0.05	0.35	0.05	0.35
	Pump reverse	0.75	0.25	0.65	0.75
	Tubing plugged	0.70	0.70	0.70	0.70
well_005	Normal	0.20	0.30	0.20	0.30	Pump wear
	Shaft breakage	0.55	0.55	0.85	0.85
	Tubing leakage	0.80	0.45	0.70	0.80
	Pump plugging	0.75	0.65	0.90	0.90
	Perforation plugging	0.75	0.75	0.75	0.75
	Water-cut rise	0.45	0.55	0.55	0.55
	Wellhead shut-in	0.15	0.25	0.15	0.25
	Reservoir pressure increase	0.45	0.50	0.45	0.50
	Gas influence	0.75	0.15	0.85	0.85
	Pump wear	0.95	0.95	1.00	1.00
	Frequency increase	0.25	0.25	0.05	0.25
	Choke stab	0.15	0.05	0.05	0.15
	Pump reverse	0.55	0.60	0.95	0.95
	Tubing plugged	0.35	0.65	0.75	0.75