| Risk Factor | Parameter | Score | Weight | Total Score |
| Pressure of Annulus A | ≥Maximum limit pressure | 8 | 5 | 40 |
| Maximum limit pressure > x > Maximum allowable pressure | 3 | 5 | 15 | |
| Maximum allowable pressure > x > Maximum recommended pressure | 2 | 5 | 10 | |
| Maximum recommended pressure > x > Minimum reserve pressure | 0 | 5 | 0 | |
| Minimum reserve pressure > x ≥ Minimum limit pressure | 8 | 5 | 40 | |
| Pressure of Annulus B | ≥Maximum limit pressure | 8 | 4 | 32 |
| Maximum limit pressure > x > Maximum allowable pressure | 3 | 4 | 12 | |
| Maximum allowable pressure > x > Maximum recommended pressure | 2 | 4 | 8 | |
| Maximum recommended pressure > x > 0.7 MPa | 0 | 4 | 0 | |
| 0.7 > x ≥ 0 MPa | 3 | 4 | 12 | |
| Pressure of Annulus C | ≥Maximum limit pressure | 8 | 4 | 32 |
| Maximum limit pressure > x > Maximum allowable pressure | 3 | 4 | 12 | |
| Maximum allowable pressure > x > Maximum recommended pressure | 2 | 4 | 8 | |
| Maximum recommended pressure > x > 0.7 MPa | 0 | 4 | 0 | |
| 0.7 > x ≥ 0 MPa | 3 | 4 | 12 | |
| Pressure of Annulus D | ≥Maximum limit pressure | 8 | 3 | 24 |
| Maximum limit pressure > x > Maximum allowable pressure | 3 | 3 | 9 | |
| Maximum allowable pressure > x > Maximum recommended pressure | 2 | 3 | 6 | |
| Maximum recommended pressure > x > 0.7 MPa | 0 | 3 | 0 | |
| 0.7 > x ≥ 0 MPa | 3 | 3 | 9 | |
| Pressure of Annulus E | ≥Maximum limit pressure | 8 | 3 | 24 |
| Maximum limit pressure > x > Maximum allowable pressure | 3 | 3 | 9 | |
| Maximum allowable pressure > x > Maximum recommended pressure | 2 | 3 | 6 | |
| Maximum recommended pressure > x > 0.7 MPa | 0 | 3 | 0 | |
| 0.7 > x ≥ 0 MPa | 3 | 3 | 9 | |
| Service life of well | ≤5 years | 1 | 1 | 1 |
| 5 - 10 years | 3 | 1 | 3 | |
| 10 - 15 years | 5 | 1 | 5 | |
| 15 - 20 years | 7 | 1 | 7 | |
| ≥20 years | 9 | 1 | 9 | |
| Gas well condition | Closing-in | 1 | 2 | 2 |
| Producing | 2 | 2 | 4 | |
| Formation pressure | ≥140 MPa | / | / | 7 |
| 140 MPa > x ≥ 105 MPa | / | / | 5 | |
| 105 MPa > x ≥ 70 MPa | / | / | 3 | |
| <70 MPa | / | / | 1 | |
| Production | ≥200 × 104 m3/day | / | / | 7 |
| 200 × 104 m3/day > x ≥ 100 × 104 m3/day | / | / | 5 | |
| 100 × 104 m3/day > x ≥ 50 × 104 m3/day | / | / | 3 | |
| <50 × 104 m3/day | / | / | 1 |