Description
6″ (152.4mm) IADC 117G Steel Tooth Tricone Bit — Model MT- 6 LS117G
High-Speed & High-ROP Roller Cone Bit for Soft Formations, Deep Drilling & Downhole Motor Operations
Size: 6 in / 152.4 mm
Bearing: Sealed Journal Bearing
Connection: 3 1/2″ API REG Pin
Key Performance Advantages for Field Engineers & Rig Managers:
- Optimized High ROP: Engineered with 56 precision-angled milled teeth and a 5.6 offset angle to maximize gouging-scraping action in soft, highly drillable formations.
- Severe Condition Endurance: Premium journal bearing design coupled with “G” feature gauge protection ensures stability under high-temperature, deep-hole, and high-RPM downhole motor drilling.
- Reduced Tripping Time: Enhanced tooth hardfacing prevents early cutter wear, ensuring maximum footage per bit run and lower Cost Per Foot (CPF).
Product Overview & Technical Description
The MT- 6 LS117G is a high-performance 6-inch (152.4mm) steel tooth (milled tooth) tricone drill bit specifically designed for drilling soft formations with low compressive strength and high drillability (such as sandstones, clay, shale, and soft limestone).
Categorized under IADC 117G, this bit features high-precision journal bearings engineered to withstand heavy vertical forces and high thermal stresses during deep drilling and downhole motor-driven operations. With a aggressive cone offset of 5.6 and a 33° journal angle, the MT- 6 LS117G delivers exceptional cutting structure aggressiveness while maintaining optimal gauge hold via its specialized 29-teeth gage row protection and additional gauge protection design (“G”).
Technical Specifications — MT- 6 LS117G
| Parameter | Specification Value | Engineering Context / Notes |
|---|---|---|
| Product Model | MT- 6 LS117G | Manufacturer Part Identification |
| Nominal Size (Inches) | 6″ | Standard Hole Diameter |
| Nominal Size (Metric) | 152.4 mm | Metric Equivalent |
| IADC Code | 117 | Steel Tooth Bit for Soft Formations |
| Additional Features | G | Enhanced Heel & Gage Row Hardfacing Protection |
| Target Formation | Soft Formations | Low Crushing Resistance & High Drillability (Shale, Clay, Soft Lime) |
| Drilling Applications | Rotary, High-Temp, Deep Well, Motor Drilling | Compatible with high-speed turbine/motor and direct rotary rigs |
| Bearing Type | Journal Bearing (Sealed) | High-load, temperature-resistant sealed journal sleeve bearing |
| Total Teeth Count | 56 | Optimized spacing for cuttings removal & fluid hydraulics |
| Gage Row Teeth Count | 29 | Maintains true hole gauge and reduces hole-tapering risk |
| Number of Gage Rows | 3 | Dedicated outer boundary cutters |
| Number of Inner Rows | 4 | Intermeshing profile for complete bottom-hole coverage |
| Journal Angle | 33° | Optimized cone journal alignment for mechanical balance |
| Cone Offset | 5.6 | High offset for enhanced scraping and gouging action |
| API Connection | 3 1/2″ REG Pin | Standard API Thread Specification |
| Weight on Bit (WOB) | 53 – 137 KN | Recommended operational weight on bit range |
| Rotary Speed (RPM) | 60 – 300 RPM | Flexible speed envelope (Rotary vs Downhole Motor) |
| Recommended Upper Torque | 9.5 – 12.2 KN.m | Makeup & dynamic torque specification |
Field Pain Points Solved by MT- 6 LS117G
1. Pain Point: Rapid Tooth Wear & Tooth Loss in Sticky/Soft Rock
Solution: Features tungsten carbide hardfacing on teeth surfaces and a 56-tooth high-clearance design that prevents balling, enhances hydraulic cleaning, and prolongs cutter lifecycle under high torque.
2. Pain Point: Gauge Wear & Undergage Hole Problems
Solution: Equipped with 29 gauge row teeth across 3 gage rows and “G” grade protection, ensuring the bit maintains exact 152.4mm hole clearance without causing drill string sticking or casing reaming issues.
3. Pain Point: High-Temperature Bearing Failure during Deep Motor Drilling
Solution: Integrated high-grade sealed journal bearings designed to withstand friction heat and mud downhole pressures at depths, minimizing premature seal failure during continuous high-RPM motor runs.
4. Pain Point: Excessive Cost Per Foot (CPF) Due to Frequent Bit Trips
Solution: Combined offset scraping structure (5.6 offset) and durable journal metallurgy deliver higher Rate of Penetration (ROP), drastically reducing total drilling hours and trip downtime.
Recommended Drilling Parameters & Field Operation Guide
To ensure maximum longevity and optimal penetration rate for the MT- 6 LS117G, adhere to the following recommended operational boundaries:
- Rotary Speed (RPM): Maintain between 60 to 300 RPM. Use lower RPMs when applying higher WOB in interbedded streaks, and higher RPMs when utilizing PDM downhole motors in soft shale.
- Weight on Bit (WOB): Apply gradually within 53 KN to 137 KN. Avoid sudden impact loading upon tag-bottom to protect cone journal bearings.
- Hydraulics & Nozzle Selection: Ensure sufficient flow rates to clean the 56-tooth cutting structure effectively, preventing bit balling in sticky clay formations.
- Make-up Torque: Ensure tightening torque stays within 9.5 to 12.2 KN.m using standard 3 1/2″ API REG thread lubricant.
Frequently Asked Questions (FAQ)
