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

Table 1

Standard SPC eight different criteria.

SPC guidelines	Specific rules
Guideline 1	1 point falls outside of zone A
Guideline 2	9 consecutive points fall on the same side of the center line CL
Guideline 3	6 consecutive points have the same change trend
Guideline 4	Adjacent points in consecutive 14 points alternate up and down
Guideline 5	2 out of 3 consecutive points fall outside of zone B on the same side of the center line CL
Guideline 6	4 out of 5 consecutive points fall outside the C zone on the same side of the center line CL
Guideline 7	15 consecutive points fall within the C area on both sides of the center line CL
Guideline 8	8 consecutive points fall on both sides of the center line C, and none of them are in the C zone