API Spec 7-2 Drill Bits
- Type: Roller Cone Bits (Tricone Bits); Fixed Cutter Bits (PDC Bits)
- Connection: API REG
- Tricone Bits Size: 3 7/8″ to 26″
- PDC Bits Size: 3 3/4″ to 17 1/2″
API Spec 7-2 Drill Bits
API Spec 7-2 Drill Bits are essential tools in the drilling industry, designed to meet the rigorous demands of modern oil and gas exploration. These drill bits adhere to the stringent standards of API Spec 7-2, ensuring high performance, durability, and reliability in various drilling environments. With advanced design and material specifications, API Spec 7-2 Drill Bits offer superior cutting efficiency and longevity, reducing downtime and operational costs. Selecting API Spec 7-2 compliant drill bits guarantees optimal drilling performance, enhancing the efficiency and safety of your drilling operations.
Specifications of API Spec 7-2 Drill Bits
| Parameters | Details |
| Standard | API Spec 7-2 Drill Bits |
| Types of Drill Bits | Roller Cone Bits, Fixed Cutter Bits, Polycrystalline Diamond Compact (PDC) Bits |
| Material | High-grade alloy steel, tungsten carbide inserts, synthetic diamond cutters |
| Design Features | Varying blade counts, cutter sizes, and configurations tailored for specific formations and drilling conditions |
| Roller Cone Bits (Tricone Bits) | |
| Type | Milled Tooth, Tungsten Carbide Insert (TCI) |
| Cone Configuration | 2-cone, 3-cone, 4-cone designs |
| Bearing Types | Sealed roller bearings, sealed journal bearings, open bearings |
| Seals | Elastomer seals, metal face seals |
| Gage Protection | Tungsten carbide inserts, diamond-enhanced gage protection |
| Cutting Structure | Various tooth shapes and sizes, optimized for soft to hard formations |
| Diameter (inches) | 3 7/8″ to 26″ |
| Connection Size | API Reg (varies by bit size) |
| Length (inches) | Varies based on bit design |
| Weight (lbs) | Varies based on size and type |
| Fixed Cutter Bits (PDC Bits) | |
| Type | Polycrystalline Diamond Compact (PDC), Natural Diamond Bits |
| Blade Count | 3 to 8 blades, optimized for formation and drilling parameters |
| Cutter Sizes | Various sizes (typically 13mm, 16mm, 19mm, 25mm) |
| Cutter Configuration | Optimized for directional stability, drilling speed, and durability |
| Matrix Material | Steel body, matrix body with diamond-enhanced material |
| Nozzle Configurations | Multiple nozzles for efficient fluid flow and cutting removal |
| Diameter (inches) | 3 3/4″ to 17 1/2″ |
| Connection Size | API Reg (varies by bit size) |
| Length (inches) | Varies based on bit design |
| Weight (lbs) | Varies based on size and type |
Milled tooth & Insert tooth Rock Bits Size Chart for Water Well Drilling
| Diameter/Inch | Bits Type (IADC CODE) | Thread |
| 4 3/4 | 114,115,231,241,435,437,445,517,537,637… | 2 7/8 API REG Pin |
| 4 7/8 | 114,115,231,241,435,437,445,517,537,637… | 2 7/8 API REG Pin |
| 5 1/2 | 114,115,231,241,435,437,445,517,537,637… | 3 1/2 API REG Pin |
| 5 5/8 | 1114,115,231,241,435,437,445,517,537,637… | 3 1/2 API REG Pin |
| 5 2/3 | 1114,115,231,241,435,437,445,517,537,637… | 3 1/2 API REG Pin |
| 5 3/4 | 1114,115,231,241,435,437,445,517,537,637… | 3 1/2 API REG Pin |
| 5 7/8 | 114,115,231,241,435,437,445,517,537,637… | 3 1/2 API REG Pin |
| 6 | 117, 121, 127, 321,217,427,437,517,537,547… | 3 1/2 API REG Pin |
| 6 1/8 | 117, 121, 127, 321,217,427,437,517,537,547… | 3 1/2 API REG Pin |
| 6 1/4 | 114,115,231,241,435,437,445,517,537,637… | 3 1/2 API REG Pin |
| 6 1/2 | 117, 121, 127, 321,217,427,437,517,537,547… | 3 1/2 API REG Pin |
| 6 5/8 | 117, 121, 127, 321,217,427,437,517,537,547… | 3 1/2 API REG Pin |
| 6 3/4 | 114,115,231,241,435,437,445,517,537,637… | 3 1/2 API REG Pin |
| 7 1/2 | 114,115,231,241,435,437,445,517,537,637… | 4 1/2 API REG Pin |
| 7 5/8 | 114,115,231,241,435,437,445,517,537,637… | 4 1/2 API REG Pin |
| 7 7/8 | 111,121,131,211,241,311,437,447,517,537… | 4 1/2 API REG Pin |
| 8 3/8 | 114,115,231,241,435,437,445,517,537,637… | 4 1/2 API REG Pin |
| 8 1/2 | 114,115,231,241,435,437,445,517,537,637… | 4 1/2 API REG Pin |
| 8 5/8 | 114,115,231,241,435,437,445,517,537,637… | 4 1/2 API REG Pin |
| 8 3/4 | 114,115,231,241,435,437,445,517,537,637… | 4 1/2 API REG Pin |
| 9 1/2 | 114,115,231,241,435,437,445,517,537,637… | 6 5/8 API REG Pin |
| 9 5/8 | 114,115,231,241,435,437,445,517,537,637… | 6 5/8 API REG Pin |
| 9 7/8 | 111,121,124,127,134,517,537,547,637,737… | 6 5/8 API REG Pin |
| 10 1/2 | 114,115,231,241,435,437,445,517,537,637… | 6 5/8 API REG Pin |
| 10 5/8 | 117,126,127,137,216,437,517,537,637,737… | 6 5/8 API REG Pin |
| 11 | 114,115,231,241,435,437,445,517,537,637… | 6 5/8 API REG Pin |
| 11 5/8 | 114,115,125,135,124,214,517,537,617,627… | 6 5/8 API REG Pin |
| 12 | 115,125,135,435,445,517,537,547,637,747… | 6 5/8 API REG Pin |
| 12 1/4 | 114, 124,126,127,131,214,225,435,517,537… | 6 5/8 API REG Pin |
| 13 1/2 | 114,115,231,241,435,437,445,517,537,637… | 6 5/8 API REG Pin |
| 13 5/8 | 114,115,124,125,134,214,437,517,537,747… | 6 5/8 API REG Pin |
| 13 3/4 | 114,115,124,125,134,214,437,517,537,647… | 6 5/8 API REG Pin |
| 14 1/2 | 114,115,231,241,435,437,445,517,537,637… | 7 5/8 API REG Pin |
| 14 3/4 | 114,115,231,241,435,437,445,517,537,637… | 7 5/8 API REG Pin |
| 15 1/2 | 114,115,231,241,435,437,445,517,537,637… | 7 5/8 API REG Pin |
| 16 | 114, 117, 121,124, 131,134, 127, 517,537… | 7 5/8 API REG Pin |
| 17 1/2 | 117,127124,135,215,235,435,515,535,537… | 7 5/8 API REG Pin |
Recommended Parameters
| IADC code | WOP (KN/mm) |
Rotary speed (r/min) |
Applicable Formation |
| 126, 127 | 0.35-1.00 | 70-150 | Soft with low compressive strength and high drillability, such as shale, clay, salt bed soft limestone, etc. |
| 437 | 0.35-0.95 | 60-140 | Very soft with low compressive strength and high drillability, such as shale, clay, sandstone, etc. |
| 517 | 0.35-1.05 | 50-120 | Soft with low compressive strength and high drillability, such as shale, mudstone, sandstone, soft limestone, etc. |
| 527 | 0.35-1.05 | 50-120 | Soft with low compressive strength, such as shale, clay, sandstone, soft limestone, salt bed, etc. |
| 537 | 0.5-1.05 | 40-110 | Medium soft with low compressive strength and harder abrasive stringers, such as mudstone, sandstone, etc. |
Recommended Torque
| Bits Size / (Inch) | Torque / (N.m) |
| 3 1/2～4 1/2 | 4100～4700 |
| 4 5/8～5 | 6100～7500 |
| 5 1/8～6 3/4 | 9500～12200 |
| 7 1/2～8 3/4 | 16300～21700 |
| 9 1/2～13 3/4 | 38000～43400 |
| 14 1/2～17 1/2 | 46100～54200 |
Applications of API Spec 7-2 Drill Bits
| Type of Bit | Applications |
| Fixed Cutter Bits (PDC Bits) |
– High-speed drilling in various rock formations (shales, limestones, sandstones) |
| – Directional and horizontal drilling | |
| – Long lateral sections and extended reach wells | |
| Roller Cone Bits (Tricone Bits) |
– Versatile applications across different rock types |
| – Soft to medium-hard formations | |
| – Vertical and deviated wells | |
| – Suitable for both oil and gas drilling |
