Oilfield Drilling Bits
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Recommended drilling parameters
| Formation | Bit Type | Drilling Weight | Rotary Speed |
| (KN/mm) | (r/m) | ||
| Very soft: such as soft marl, unconsolidated sand-stone, salt, etc. | 437 | 0.4-0.7 | 100-50 |
| Soft strata with low compressive strength and high drill ability, such as shale, clay, sandstone, soft limestone, etc | 515 | 0.25-0.7 | 140-80 |
| Soft strata with low compressive strength and high drill ability, such as shale, clay, sandstone, soft limestone, etc | 517 | 0.35-0.9 | 100-50 |
| Low compressive strength, medium and soft, and relatively hard abrasive interlayer strata, such as hard shale, hard gypsum, soft limestone, sandstone, laminated dolomite, etc | 537 | 0.5-0.9 | 180-40 |
| Formation with moderate hardness with high compressive strength ,Such as hard shale, limestone, sandstone, etc | 617 | 0.5-1.0 | 80-40 |
| With hard abrasive streak,such as hard shale,anhydrite,soft lime-stone,dolomite,etc | 637 | 0.55-1.05 | 70-30 |
Main Models
| Bit size | Bit type | |
| inch | mm | |
| 3 3/8 | 85.7 | GY537 |
| 3 7/8 | 98.4 | GY537 |
| 4 9/16 | 115.9 | GY437 |
| 4 5/8 | 117.5 | GY437、GY537 |
| 5 1/8 | 130.2 | GY537 |
| 5 1/4 | 133.4 | GY537 |
| 5 1/2 | 139.7 | GY537 |
| 5 5/8 | 142.9 | GY537、GY637 |
| 5 3/4 | 146.1 | GY537、GY637 |
| 5 7/8 | 149.2 | GY517 |
| 6 | 152.4 | GY537、GY617、GY637、GY737 |
| 6 1/8 | 155.6 | GY517 |
| 6 1/2 | 165.1 | GY547、GY637 |
| 7 1/2 | 190.5 | GY547 |
| 7 5/8 | 193.7 | GY537 |
| 7 7/8 | 200 | GY517、GY617、GY647 |
| 8 3/8 | 212.7 | GY517 |
| 8 1/2 | 215.9 | GY437、GY517、GY537、GY617、GY637 |
| 8 5/8 | 219.1 | GY617 |
| 8 3/4 | 222.3 | GY437、GY517、GY537、GY637 |
| 9 | 228.6 | GY537、GY637 |
| 9 1/2 | 241.3 | GY437、GY517、GY537、GY637 |
| 9 5/8 | 244.5 | GY537、GY617 |
| 9 3/4 | 247.7 | GY437 |
| 9 7/8 | 250.8 | GY437、GY517、GY537、GY617、GY637 |
| 10 5/8 | 269.9 | GY437、GY537、GY637 |
| 11 | 279.4 | GY617 |
| 11 5/8 | 295.3 | GY437、GY517、GY537 |
| 12 3/8 | 314.3 | GY517 |
| 12 1/4 | 311.2 | GY437、GY517、GY537、GY637 |
| 12 3/4 | 323.9 | GY537 |
| 13 1/8 | 333.4 | GY537 |
| 13 5/8 | 346.1 | GY517、GY537、GY617、GY637 |
| 13 3/4 | 349.3 | GY417、GY637 |
| 14 1/4 | 368.3 | GY537 |
| 14 3/4 | 374.7 | GY515、GY517、GY537 |
| 15 | 381 | GY515 |
| 15 1/2 | 393.7 | GY435、GY545、GY637 |
| 16 | 406.4 | GY435、GY515、GY617、GY637 |
| 17 1/2 | 444.5 | GY515、GY517、GY537、GY637 |
| 18 1/2 | 469.9 | GY537 |
| 20 | 508 | GY535 |
| 23 | 584.2 | GY435、GY515 |
| 26 | 660.4 | GY515 |
Recommended drilling parameters
| Formation | Bit Type | Drilling Weight | Rotary Speed |
| (KN/mm) | (r/m) | ||
| Very soft with low compressive strength, such as soft marl, clay,unconsolidated sandstorm, salt, etc. | GHJ437 | 0.30-0.90 | 180-60 |
| Soft with low compressive strength, such as shale, clay, sandstone, soft limestone, etc. | GHJ517 | 0.35-1.05 | 180-60 |
| Medium soft with hard abrasive streak, such as hard shale, soft limestone,sandstone, etc. | GHJ537 | 0.35-1.05 | 180-40 |
| Formation with high compressive strength, medium-hard and high abrasive properties, such as limestone, dolomite, sandstone, flint, etc. | GHJ637 | 0.50-1.05 | 160-40 |
| Formation with moderate hardness with high compressive strength, such as hard shale, limestone, sandstone, dolomite, etc. | GHJ617 | 0.4-1.05 | 160-40 |
Note: The upper limits of drilling weight and rotary speed recommended in above table could not be used at the same time.
Main Models
| Bit size | Bit Type | |
| inch | mm | |
| 8 1/2 | 215.9 | GHJ437、GHJ517、GHJ537、GHJ617 |
| 8 3/4 | 222.2 | GHJ437、GHJ517、GHJ537、 |
| 9 1/2 | 241.3 | GHJ437、GHJ537、GHJ637 |
| 10 5/8 | 269.9 | GHJ537、GHJ637 |
| 12 1/4 | 311.2 | GHJ537、GHJ637 |
| 13 5/8 | 346.1 | GHJ637 |
Additional features can be selected according to SY/T 5164, and can be designed and developed according to user requirements
Recommended drilling parameters
| Formation | Bit Type | Drilling Weight | Rotary Speed |
| (KN/mm) | (r/m) | ||
| Very soft: such as soft marl, clay, salt, etc. | 111 | 0.4-0.7 | 180-90 |
| Very soft: such as soft marl, clay, soft sandstone, salt, etc. | 114 | 0.4-0.7 | 120-45 |
| Soft: such as clay, marl, soft sandstone, salt,etc. | 121 | 0.45-0.75 | 180-90 |
| Soft: such as clay, soft shale, marl, salt, etc. | 124 | 0.5-0.85 | 120-45 |
| Soft: such as clay, marl, soft sandstone, salt,etc. | 127 | 0.45-0.75 | 180-90 |
| Medium soft: such as shale, marl,sandstone,soft limestone, etc. | 131 | 0.5-0.75 | 120-60 |
Note: The upper limits of drilling weight and rotary speed recommended in above table could not be used at the same time.
Main models
| Bit Size Diameter | Bit Type | |
| inch | mm | |
| 3 3/4 | 95.3 | GY126 |
| 3 5/8 | 92.1 | GY126 |
| 3 7/8 | 98.4 | GY131 |
| 4 1/2 | 114.3 | GY126 |
| 4 5/8 | 117.5 | GY126 |
| 8 1/2 | 215.9 | GY121、GY114、GY124、GY127 |
| 9 1/2 | 241.3 | GY127 |
| 9 5/8 | 244.5 | GY121、GY124、GY127 |
| 9 7/8 | 250.8 | GY127 |
| 12 1/4 | 311.2 | GY121、GY124、GY126、GY127L |
| 13 3/4 | 349.3 | GY127、GY127L |
| 17 1/2 | 444.5 | GY121、GY124、GY125、GY127L |
| 15 | 381 | GY127、GY127L |
| 26 | 660.4 | GY111 |
Recommended drilling parameters
| Formation | Bit Type | Drilling Weight | Rotary Speed |
| (KN/mm) | (r/m) | ||
| Soft formations with low compressive strength and high drillability , such as soft marl,salt, uncon-solidated sandstorm, salt, etc. | 437 | 0.25-0.5 | 160-60 |
| Soft to medium formations with low compressive strength, such as shale , clay, sandstone, soft limestone, etc. | 517 | 0.25-0.5 | 160-60 |
| Low compressive strength, medium and soft, and relatively hard abrasive interlayer strata, such as hard shale, hard gypsum, soft limestone, sandstone, laminated dolomite, etc | 537 | 0.25-0.5 | 140-60 |
| Formation with moderate hardness with high compressive strength ,Such as hard shale, limestone, sandstone, etc | 617 | 0.25-0.5 | 140-60 |
| With hard abrasive streak,such as hard shale,anhydrite,soft lime-stone,dolomite,etc | 637 | 0.25-0.5 | 140-60 |
Note: The upper limits of drilling weight and rotary speed recommended in above table could not be used at the same time.
Main Models
| Bit size | Bit Type | |
| inch | mm | |
| 4 1/4 | 104.8 | GYD537、GYD617 |
| 4 3/4 | 120.7 | GYD517、GYD537、GYD617、GYD637 |
| 4 5/8 | 117.5 | GYD517、GYD537、GYD617 |
| 6 | 152.4 | GYD437、GYD517、GYD537、GYD617、GYD637 |
It can be designed and developed according to user needs.
Recommended drilling parameters
| Formation | Bit Type | Drilling Weight | Rotary Speed |
| (KN/mm) | (r/m) | ||
| Medium hard with low compeissive strength f=8~10 | KX54 | 400-850 | 120-80 |
| Medium hard with high compeissive strength f=10~12 | KX64 | 500-900 | 100-60 |
| Hard with hard abrasive or semi-adrasive f=12~16 | KX73 | 600-1200 | 80-50 |
| Hard with hard abrasive or semi-adrasive f=12~16 | KX74 | 600-1200 | 80-50 |
Note: The upper limits of drilling weight and rotary speed recommended in above table could not be used at the same time.
Main Models
| Bit size（mm） | Bit Type |
| 150 | KX73、KX74 |
| 200 | KX63、KX64、KX74 |
| 250 | KX54、KX63、KX64、KX84 |
| 311 | KX53 |
| 349 | KX73 |
Engineering single roller bits
Recommended drilling parameters
| Formation | Bit Type | Drilling Weight | Rotary Speed |
| (KN/mm) | (r/m) | ||
| Formation with moderate hardness with high compressive strength, such as hard shale, limestone, sandstone, dolomite, etc. | 617 | 0.4-1.05 | 160-40 |
| Formation with high compressive strength, medium-hard and high abrasive properties, such as limestone, dolomite, sandstone, flint, etc. | 637 | 0.50-1.05 | 160-40 |
Note: The upper limits of drilling weight and rotary speed recommended in above table could not be used at the same time.
Main Type
| Bit size | Bit Type | |
| inch | mm | |
| 9 1/2 | 241.3 | GY537、GY617、GY637、GHJ537、GHJ617、GHJ637 |
| 8 1/2 | 215.9 | GY537、GY617、GY637、GHJ537、GHJ617、GHJ637 |
| 10 5/8 | 269.9 | GY537、GY637、GHJ537、GHJ637 |
| 12 1/4 | 311.2 | GY537、GY617、GY637、GHJ537、GHJ617、GHJ637 |
| 13 5/8 | 346.1 | GY617、GY637、GHJ617、GHJ637 |
It can be designed and developed according to user needs.
8½ GP/GC/GZ series engineering pieces main models and recommended use of strata and installation dimensions:
| Type | Apply formation | Installation dimensions | |
| The base facing outwards is higher than the outer diameter of the barrel wall（H） | The roller base facing inward is higher than the outer diameter of the barrel wall（H） | ||
| 8 1/2 GC527 | Compressive strength <50MPa, soft strata, such as salt rock, schist, anhydrite, sandstone, siltstone, soft limestone, etc. | H=(D-d)/2-32 | H=(D-d)/2-10 |
| 8 1/2 GP527 | |||
| 8 1/2 GZ527 | |||
| 8 1/2 GC537 | Compressive strength 50 -- 120MPa, medium hard strata, such as sandstone, SLATE, shale, limestone, etc. | H=(D-d)/2-29 | H=(D-d)/2-11 |
| 8 1/2 GP537 | |||
| 8 1/2 GZ537 | |||
| 8 1/2 GC617 | Compressive strength 120-190mpa, hard strata, such as quartzite, basalt, gabbro, limestone, dolomite and so on. | H=(D-d)/2-32 | H=(D-d)/2-10 |
| 8 1/2 GP617 | |||
| 8 1/2 GZ617 | |||
| Bit Size (Inches) | Recommended drilling parameters | ||||
| Flow Rate | Rotation Speed | Weight On Bit | Makeup torque | Specific Hydraulic | |
| (L/s) | (r/min) | (KN) | (KN·M) | Horsepower (HIS) | |
| 8 1/2 | 25-38 | 60-250 | 30-100 | 24-26.5 | 2-7 |
| 8 1/8 | 25-38 | 60-250 | 30-100 | 24-26.5 | 2-7 |
| 8 3/4 | 25-38 | 60-250 | 30-100 | 24-26.5 | 2-7 |
| 8 3/8 | 25-38 | 60-250 | 30-100 | 24-26.5 | 2-7 |
| 9 1/2 | 25-38 | 60-250 | 30-100 | 40-45 | 2-7 |
| 12 1/4 | 44-66 | 60-250 | 30-100 | 50-60 | 2-7 |
Note: The upper limits of drilling weight and rotary speed recommended in above table could not be used at the same time.
Main Type
| Type | Bit Size | Std.API pin Shank Size | Approximate weight | |
| inch | mm | (inches) | of bits (Kg) | |
| 8 1/2M1234AL | 8 1/2 | 215.9 | 4 1/2REG | 70 |
| 8 1/2M3235AL | 8 1/2 | 215.9 | 4 1/2REG | 70 |
| 8 1/2M2235ALF | 8 1/2 | 215.9 | 4 1/2REG | 70 |
| 8 1/2M3235BLF | 8 1/2 | 215.9 | 4 1/2REG | 70 |
| 8 1/2M2235L | 8 1/2 | 215.9 | 4 1/2REG | 70 |
| 8 1/2M3236AL | 8 1/2 | 215.9 | 4 1/2REG | 70 |
| 8 1/8M1953GZFA | 8 1/8 | 206.4 | 4 1/2REG | 63 |
| 8 3/4M3235AL | 8 3/4 | 222.3 | 4 1/2REG | 72 |
| 8 3/4M2235ALF | 8 3/4 | 222.3 | 4 1/2REG | 72 |
| 8 3/8M1953GLFA | 8 3/8 | 212.7 | 4 1/2REG | 67 |
| 9 1/2M3235L | 9 1/2 | 241.3 | 6 5/8REG | 85 |
| 9 1/2M3236L | 9 1/2 | 241.3 | 6 5/8REG | 85 |
| 12 1/4M3235 | 12 1/4 | 311.1 | 6 5/8REG | 105 |
