Three-Cone Steel Tooth (ST) Bit (IADC 216/217 Soft to Medium-Hard Formation Specialized)
The Three-Cone Steel Tooth (ST) Bit utilizes premium alloy steel milling teeth process + tooth surface reinforcement treatment, combined with multi-gauge protection structure and high-performance sealed bearings. Featuring IADC 216/217 series tooth configurations, specifically optimized for soft to medium-hard formations, this bit can withstand high weight on bit (WOB) at conventional rotation speeds. With low cutting resistance and fast rock breaking speed in soft formations, it is suitable for petroleum exploration, water well drilling, geothermal development, mining, and other deep hole drilling applications, offering a cost-effective solution for efficient drilling in soft to medium-hard formations.
Widely used in petroleum exploration soft formation deep hole drilling, water well drilling completion, shallow geothermal drilling, mining soft rock blast hole drilling, geological exploration soft formation sampling, and various soft to medium-hard formation deep hole foundation engineering drilling.
Core Advantages
Alloy Steel Milled Teeth + Reinforcement · Efficient Soft Formation Cutting
Utilizes steel tooth structure milled from premium alloy steel with tungsten carbide hardfacing or special reinforcement treatment on tooth surfaces, significantly enhancing tooth wear resistance and impact resistance. IADC 216/217 features high-exposure sparse tooth structure with sharp cutting edges, providing low cutting resistance and fast rock breaking speed in soft formations. Reinforced tooth surfaces can withstand mild abrasive wear in medium-hard formations, balancing soft formation efficiency with medium-hard formation durability.
Multi-Gauge Protection Structure · Stable & Long-Lasting Hole Accuracy
Features multi-gauge protection design: outer row cone teeth retain gauge trimming structure, with wear-resistant alloy hardfacing on leg back, leg tips, and front sides. Comprehensive gauge protection effectively maintains hole diameter accuracy, reduces borehole wall wear and deviation risks, ensuring more stable hole quality and adapting to long-duration deep hole drilling requirements.
High-Precision Bearing Structure · Durable Under High WOB
Incorporates high-precision radial sliding and axial thrust bearings with steel ball locking structure ensuring bearing stability. Leg journals are welded with wear-resistant alloy, and cone bores are welded with special alloy and silver-plated, significantly enhancing bearing wear resistance and anti-galling capability. Capable of withstanding high WOB loads, extending bearing service life, adapting to deep hole high-load drilling conditions.
High-Performance Sealed Lubrication System · Reliable Long-Term Operation
Utilizes high-performance sealing rings combined with optimal seal compression and arc-shaped sealing structure, effectively improving bearing sealing performance and preventing mud and cuttings intrusion. Employs high-performance specialized bit lubricating grease, ensuring adequate bearing lubrication and low friction loss, adapting to long-duration high-load drilling operations, reducing bearing failure risks.
IADC 216/217 Exclusive Adaptation · Targeted for Soft to Medium-Hard Formations
Exclusive IADC 216/217 high-exposure sparse tooth structure precisely matches soft to medium-hard formation characteristics, maximizing cutting efficiency. No need for complex tooth configuration changes, focusing on soft to medium-hard formation drilling for more efficient construction and better cost control.
Applications
Suitable Formations
Soft to medium-hard formations including mudstone, soil layers, soft shale, loose sandstone, etc. (F≤6)
✅ Specifically optimized for soft to medium-hard formations adapted to IADC 216/217
Not recommended for hard formations above medium-hard (F＞6, such as dense limestone, granite) and highly abrasive formations.
Drilling Method
Rotary Drilling (Conventional RPM, High WOB Compatible)
Recommended to use mud circulation or high-pressure clean water circulation to ensure adequate bit cooling and efficient cuttings removal. According to soft to medium-hard formation characteristics, appropriately increase rotation speed and control reasonable WOB to fully utilize steel tooth cutting and bearing system performance, extending bit service life.
Product Specifications
I. Standard Bit Sizes (Inches / Millimeters)
| Inch Size | Millimeter Size | Inch Size | Millimeter Size |
|---|---|---|---|
| 5-5/8″ | 143mm | 9-5/8″ | 244mm |
| 5-7/8″ | 149mm | 9-7/8″ | 251mm |
| 7-5/8″ | 194mm | 10-5/8″ | 270mm |
| 7-7/8″ | 200mm | 11-5/8″ | 295mm |
| 8-1/2″ | 216mm | 12-1/4″ | 311mm |
| 9-1/2″ | 241mm | 13-5/8″ | 346mm |
| — | — | 14-3/4″ | 375mm |
II. IADC Models
(Exclusive tooth configurations for soft to medium-hard formations)
Customization Services
Can customize tooth surface reinforcement process, exposure height, and gauge protection structure according to specific soft to medium-hard formation characteristics (such as mudstone, loose sandstone). Custom non-standard sizes and special thread types available to adapt to different drill rig models. Can optimize bearing and sealing systems to enhance durability for long-duration soft formation drilling.
Our Manufacturing Excellence
From precision machining to final assembly — every drill bit is crafted in our ISO 9001 certified facility.
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