1. Drill for 5 minutes with initially selected proper WOB and moderate RPM (60~100r/min) and record the ROP (as shown in the table below).
2. Moderately inctease WOB and keep the same RPM and drill under this WOB for 5 minutes and again record the RPO (as shown in the table below).
3. Decrease WOB b the same extent and tepeat step 2.
4. Find the WOB in the tow groups of test than can yield highest ROP.
5. Properly change RPM under optimal WOB and record the ROP (as shown in the table below).
6. Select the RPM at the highest ROP.
7. Set the drilling parameter at the best combination:60KN RPM: 120r/min
Factory Price 22 Inch IADC 517 Api Tci Tricone Drill Bit Oil Well Direction Rock Drilling
Product Description
Product Description
| Basical Specification | |
| Size of tricone bit | 22 inch 558.8mm |
| Connection | 7 5/8" Reg pin |
| IADC code | 517 537 |
| Bearing | Journal /roller |
| Sealed | rubber or metal sealed |
| Operating Parameters | |
| WOB (Weight On Bit) | 0.35~1.05 KN/mm (bit Dia.) |
| Rotary speed | 110~40 r/min |
| Make up torque | 8.5~12.2 KN.M |
| Formation | Medium formation with high compressive strength ,and high drillability ,such as mudstone, gypsum,salt,soft limestone,etc. |
Optimal test method for drilling parameters
| Times | RPM:100r/min | WOB:60KN | ||
| WOB (KN) | Drilling hour (min/m) | RPM (r/min) | Drilling hour (min/m | |
| 1 | 80 | 8 | 100 | 7 |
| 2 | 100 | 9 | 120 | 5.5 |
| 3 | 60 | 7 | 80 | 8 |
| Select | 60 | 7 | 120 | 5.5 |
| IADC code | WOB (KN/mm) | RPM (r/min) | Applicable Formations |
| 437/447/435 | 0.35~0.9 | 240~70 | Very soft formations with low compressive strength and high drillability,such as clay,mudstone,chalk,gypsum,salt,soft limestone, etc. |
| 517/527/515 | 0.35~1.0 | 220~60 | Soft formations with low compressive strength and high drillability,such as mudstone,gypsum,salt,soft limestone, etc. |
| 537/547/535 | 0.45~1.0 | 220~50 | Soft to medium formations with low compressive strength, such as medium, soft shale, medium soft limestone, medium soft sandstone, medium formation with harder and abrasive interbeds, etc. |
| 617/615 | 0.45~1.1 | 200~50 | Medium hard formation with high compress strength, such as hard shale, limestone, sandstone, dolomite. etc |
| 637/635 | 0.5~1.1 | 180~40 | Hard formations with high compressive strength, such as sandstone, limestone, dolomite ,hard gypsum, marble, etc. |