Hexagonal Kelly
Kelly is located in the top of the drill string, with square and hexagonal. In rotary drilling, when it is drilling, kelly connected with square bushing and rotary bushing, transfer the ground rotary torque to Heavy Weight Drill Pipe and to drive the drill bit,bearing the weight of the drill string.In the drilling of the turbine and screw, the weight of the drill string and the counter torque are supported.
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Square Kelly Specification:
Specification | Drive part length | Overall length | Drive part | Upper internal threaded joint | Lower external threaded joint | Inner diameter | |||||||||||||||||
StandardLD | SelectionLD | Standard | Selection | Square sizeDFL | Across cornerDC | Across cornerDCC | RadiusRC | RadiusRCC | Eccentric hole minimum wall thickness | Screw thread specification and left rotate type | Outside diameter | Chamfering diameter | Thread specification and type | Outside diameterDLR | LengthLL | Chamfering diameterDF | |||||||
Standard | Selection | Standard | Selection DU | length LU | Standard DF | Selection DF | |||||||||||||||||
63.5 | （2½） | 11280 |
| 12190 |
| 63.5 | 83.3 | 82.55 | 7.9 | 41.3 | 11.43 | （65/8）REG | (4½)REG | 196.9 | 146.1 | 406.4 | 186.1 | 134.5 | NC26(23/8IF) | 85.7 | 508 | 82.9 | 31.8 |
76.2 | 3 | 11280 |
| 12190 |
| 76.2 | 100 | 98.43 | 9.5 | 49.2 | 11.43 | （65/8）REG | (4½)REG | 196.9 | 146.1 | 406.4 | 186.1 | 134.5 | NC31(27/8IF) | 104.8 | 508 | 100.4 | 44.5 |
88.9 | （3½） | 11280 |
| 12190 |
| 88.9 | 115.1 | 112.7 | 12.7 | 56.4 | 11.43 | （65/8）REG | (4½)REG | 196.9 | 146.1 | 406.4 | 186.1 | 134.5 | NC38(3½IF) | 120.7 | 508 | 116.3 | 57.2 |
108 | （4¼） | 11280 | 15540 | 12190 | 16460 | 108 | 141.3 | 139.7 | 12.7 | 69.9 | 12.07 | （65/8）REG | (4½)REG | 196.9 | 146.1 | 406.4 | 186.1 | 134.5 | NC46(4IF) | 158.8 | 508 | 145.3 | 71.4 |
108 | （4¼） | 11280 | 15540 | 12190 | 16460 | 108 | 141.3 | 139.7 | 12.7 | 69.9 | 12.07 | （65/8）REG | (4½)REG | 196.9 | 146.1 | 406.4 | 186.1 | 134.5 | NC50(4½IF) | 161.9 | 508 | 154 | 71.4 |
133.4 | （5¼） | 11280 | 15540 | 12190 | 16460 | 133.4 | 175.4 | 171.45 | 15.9 | 85.7 | 15.88 | （65/8）REG |
| 196.9 |
| 406.4 | 186.1 |
| 5½FH | 177.8 | 508 | 170.7 | 82.6 |
133.4 | （5¼） | 11280 | 15540 | 12190 | 16460 | 133.4 | 175.4 | 171.45 | 15.9 | 85.7 | 15.88 | （65/8）REG |
| 196.9 |
| 406.4 | 186.1 |
| NC56 | 177.8 | 508 | 170.7 | 82.6 |
Hexagonal Kelly Specification mm（in):
Specification | Drive part lengthти длины | Overall length | Drive part | Upper internal threaded joint | Lower external threaded joint | Inner diameter | |||||||||||||||||
StandardLD | SelectionLD | Standard | Selection | Square sizeDFL | Across cornerDC | Across cornerDCC | RadiusRC | RadiusRCC | Eccentric hole minimum wall thickness | Screw thread specification and left rotate type | Outside diameter | Chamfering diameter | Thread specification and type | Outside diameterDLR | LengthLL | Chamfering diameterDF | |||||||
Standard | Selection | Standard DC | Selection DU | length LU | Standard DF | Selection DF | |||||||||||||||||
63.5 | （2½） | 11280 |
| 12190 |
| 76.2 | 85.7 | 85.73 | 6.4 | 42.9 | 12.1 | （65/8）REG | (4½)REG | 196.9 | 146.1 | 406.4 | 186.1 | 134.5 | NC26(23/8IF) | 85.7 | 508 | 82.9 | 31.8 |
76.2 | 3 | 11280 |
| 12190 |
| 88.9 | 100.8 | 100 | 6.4 | 50 | 13.3 | （65/8）REG | (4½)REG | 196.9 | 146.1 | 406.4 | 186.1 | 134.5 | NC31(27/8IF) | 104.8 | 508 | 100.4 | 44.5 |
88.9 | （3½） | 11280 | 15540 | 12190 | 16460 | 108 | 122.2 | 121.44 | 9.9 | 60.7 | 15.9 | （65/8）REG | (4½)REG | 196.9 | 146.1 | 406.4 | 186.1 | 134.5 | NC38(3½IF) | 120.7 | 508 | 116.3 | 57.2 |
108 | （4¼） | 11280 | 15540 | 12190 | 16460 | 133.4 | 151.6 | 149.86 | 9.5 | 75 | 15.9 | （65/8）REG | - | 196.9 | - | 406.4 | 186.1 | - | NC46(4IF) | 158.8 | 508 | 145.3 | 71.4 |
108 | （4¼） | 11280 | 15540 | 12190 | 16460 | 133.4 | 151.6 | 149.86 | 9.5 | 75 | 15.9 | （65/8）REG | - | 196.9 | - | 406.4 | 186.1 | - | NC50(4½IF) | 161.9 | 508 | 154 | 71.4 |
133.4 | （5¼） | 11280 | 15540 | 12190 | 16460 | 152.4 | 173 | 173.02 | 9.5 | 86.5 | 15.9 | （65/8）REG | - | 196.9 | - | 406.4 | 186.1 | - | 5½FH | 177.8 | 508 | 170.7 | 82.6 |
133.4 | （5¼） | 11280 | 15540 | 12190 | 16460 | 152.4 | 173 | 173.02 | 9.5 | 86.5 | 15.9 | （65/8）REG | - | 196.9 | - | 406.4 | 186.1 | - | NC56 | 177.8 | 508 | 170.1 | 82.6 |
Steel Mark | Chemical Composition% | ||||||||
C | Si | Mn | P | S | Cr | Mo | Cu | Al | |
4145H | 0.42～0.48 | 0.15～0.35 | 0.90～1.20 | ≤0.03 | ≤0.03 | 0.90～1.20 | 0.15～0.25 | ≤0.2 | 0.025～0.045 |
Other e="微软雅黑">：N≤0.015，Ni≤0.5 | |||||||||
Mechanical Property:
Mechanical Property | ||||||||
Outside Diameter Range | Yield Strength | Tensile Strength | ElongationA% | HB | Charpy impact Akv J | |||
mm | in | MPa | Psi | MPa | Psi | |||
79.4～171.4 | 3-1/8～6-3/4 | ≥758 | ≥110000 | ≥965 | ≥140000 | ≥13 | 285～341 | ≥54 |
177.8 | 7 | ≥689 | ≥100000 | ≥930 | ≥135000 | ≥13 | 285～341 | ≥54 |
Under special conditions, the impact work of the charpy can be determined as greater than 70J according to the supply and demand | ||||||||
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