Research Article
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 |
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