Research Article
Research on Formation Identification Based on Drilling Shock and Vibration Parameters and Energy Principle
Table 6
Threshold value of each state of drilling subprocess.
| | Process parameters | Status symbol | Number of states | Threshold | Max |
| | Feed pressure | On | 1 | ≥0.40 bar | 100 bar | | Feedback pressure | On | 1 | ≥1.25 bar | 150 bar | | Flushing pressure | On | 1 | ≥0.20 bar | 20 bar | | Move forward | On | 1 | ≥10 bar | 50 bar | | Back movement | On | 1 | ≥10 bar | 50 bar | | Drill rotation | On | 1 | ≥10 r/m | 500 r/m | | Electric hoist rotation | On | 1 | ≥5 r/m | 300 r/m | | Bit displacement | On | 1 | ≥248 mm | 886 mm |
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