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

Table 8

Comparison of diagnostic results.

Well name	Working condition type	5 minutes	60 minutes	1440 minutes	Max	Diagnostic result
Fault diagnosis model based on SPC
well_002	Normal	0.60	0.40	0.20	0.60	Pump plugging; Pump wear
	Shaft breakage	0.35	0.55	0.75	0.75
	Tubing leakage	0.55	0.85	0.65	0.85
	Pump plugging	0.50	0.70	0.90	0.90
	Perforation plugging	0.25	0.35	0.65	0.65
	Water-cut rise	0.45	0.45	0.45	0.45
	Wellhead shut-in	0.10	0.10	0.10	0.10
	Reservoir pressure increase	0.30	0.45	0.30	0.45
	Gas influence	0.20	0.50	0.70	0.70
	Pump wear	0.65	0.80	0.90	0.90
	Frequency increase	0.10	0.00	0.00	0.10
	Choke stab	0.10	0.10	0.10	0.10
	Pump reverse	0.55	0.65	0.75	0.75
	Tubing plugged	0.35	0.65	0.65	0.65
The fault diagnosis model of this study
well_002	Normal	0.60	0.40	0.20	0.60	Pump plugging
	Shaft breakage	0.35	0.55	0.75	0.75
	Tubing leakage	0.55	0.75	0.65	0.85
	Pump plugging	0.50	0.85	0.90	0.90
	Perforation plugging	0.25	0.35	0.65	0.65
	Water-cut rise	0.45	0.45	0.45	0.45
	Wellhead shut-in	0.10	0.10	0.10	0.10
	Reservoir pressure increase	0.30	0.45	0.30	0.45
	Gas influence	0.20	0.50	0.70	0.70
	Pump wear	0.65	0.80	0.80	0.80
	Frequency increase	0.10	0.00	0.00	0.10
	Choke stab	0.10	0.10	0.10	0.10
	Pump reverse	0.55	0.65	0.75	0.75
	Tubing plugged	0.35	0.65	0.65	0.65