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9 7/8″ MR535 Tricone Bit
IADC 535 · Φ251mm · 65kg · 6 5/8″ API
Cutting structure & formations
Gage rows: Chisel. Inner rows: Conical. For medium-soft formations with low compressive strength, typically shale, soft limestone, dolomite with interlayers, coal ore.
ORIGINAL · EN Chisel on gage, conical on inner rows. Designed for medium-soft formations with low compressive strengths such as shale, soft limestone, dolomite with interlayers and coal ore.
Shirttail protection
Hardmetal and wear resistant carbide on shirttail lip and lug.
ORIGINAL · EN Hardmetal and wear resistant carbide on shirttail lip and lug.
- Diameter 9 7/8″ / Φ251 mm, weight 65 kg
- Connection 6 5/8″ API, bearing Roller-Ball-Roller-Thrust Button/Sealed Bearing
- WOB 19,750–49,380 lbs, rotary speed 80–110 rpm
Technical parameters
| Model | MR535 |
|---|---|
| IADC code | 535 |
| Diameter | 9 7/8″ / Φ251mm |
| Thread | 6 5/8″ API |
| Weight | 65 kg |
| Bearing type | Roller-Ball-Roller-Thrust Button/Sealed Bearing |
| Circulation | Jet Air |
| Inner row teeth | Conical |
| Gage row teeth | Chisel |
| Gage bevel protection | Round |
Operating suggestions
Actual parameters must be set per application
| Weight on bit | 19,750–49,380 lbs |
|---|---|
| Rotary speed | 80–110 rpm |
| Air back pressure | 0.2–0.4 MPa |
| Formation strength | 15,000–23,000 Psi |
