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Non-Magnetic Spiral Drill Collars

China Non-Magnetic Spiral Drill Collars, Find details about China Non-Magnetic Spiral Drill Collars, Short Nonmagnetic Drill Collars from Non-Magnetic Spiral Drill Collars

Model NO.
6.75inch, 8.25inch, 9.5inch
Drilling
Exploration Core Drilling
Drills
Wireline Core Drilling
Mining
Australia Mining
Exploration
Australia Exploration
Model No
Mining Exploration Core Drilling
Use
Africa Mining
Applications
Copper Mining Drilling
Trademark
ROSCHEN
Transport Package
Bundle
Specification
steel
Origin
China
HS Code
843143220
Model NO.
6.75inch, 8.25inch, 9.5inch
Drilling
Exploration Core Drilling
Drills
Wireline Core Drilling
Mining
Australia Mining
Exploration
Australia Exploration
Model No
Mining Exploration Core Drilling
Use
Africa Mining
Applications
Copper Mining Drilling
Trademark
ROSCHEN
Transport Package
Bundle
Specification
steel
Origin
China
HS Code
843143220

Non-Magnetic Spiral Drill Collars

Non-magnetic drill collars:
NMDCs are generally flush (nonspiral). They are manufactured from high-quality, corrosion-resistant, stainless steel. They are used while running the magnetic survey instruments to be located in a NMDC of sufficient length to allow the measurement of the earth's magnetic field without magnetic interference. Survey instruments are isolated from magnetic disturbance caused by other steel components in the BHA.

Non-magnetic Spiral Drill Collar 6.750" NC50
Specification Tool Joint/Connection Specifications
Nominal OD6 3/4"(6.75")ConnectionNC50Bend Stress Ratio 
Nominal ID2.7/8"(2.875")OD6 3/4" (6.75")ID2 7/8"(2.875")
Material GradeP530Adjusted Weight Average Length31.00 ft
Grain SizeASTMRecommended Make Up Torque Maximum Make Up Torque 
Magnetic Permeability1.001maxSlip RecessN/AElevator RecessN/A
Drift Size3 1/8"(3.125")Fluid Displacement Fluid capacity 
HardbandingNoneInspection CriteriaNS-2Elongation18%
IPC None 
Chemical PropertiesPhosphorus <0.05%
Sulphur <0.03%
Manufacturing CriteriaAPI Spec7-1
Drill Collar Capacities
Tensile Strength120,000 psi Minimum
827 Mpa
Yield Strength110,000 psi Minimum
758 Mpa
Impact StrengthAbove 60J
Hardness(Brinell)Minimum 285 BHN

Non-magnetic Spiral Drill Collar 8.250" 6 5/8" Reg
Specification Tool Joint/Connection Specifications
Nominal OD8 1/4"(8.25") Connection6 5/8" REGBend Stress Ratio 
Nominal ID2 13/16"(2.8125") OD8 1/4" (8.25")ID2 13/16" (2.8125")
Material GradeP530 Adjusted Weight Average Length31.00 ft
Grain SizeASTM Recommended Make Up Torque Maximum Make Up Torque 
Magnetic Permeability1.001max Slip RecessN/AElevator RecessN/A
Drift Size2 11/16"(2.6875") Fluid Displacement Fluid capacity 
HardbandingNone Inspection CriteriaNS-2Elongation20%
IPC None 
Chemical PropertiesPhosphorus <0.05%
Sulphur <0.03%
Manufacturing CriteriaAPI Spec7-1
Drill Collar Capacities
Tensile Strength100,000 psi Minimum
689 Mpa
Yield Strength110,000 psi Minimum
758 Mpa
Impact StrengthAbove 60J
Hardness(Brinell)Minimum 285 BHN

Non-magnetic Spiral Drill Collar 9.500" 7 5/8" Reg
Specification Tool Joint/Connection Specifications
Nominal OD9 1/2"(9.5") Connection7 5/8" REGBend Stress Ratio 
Nominal ID3"(3") OD9 1/2" (9.5")ID3" (3")
Material GradeP530 Adjusted Weight Average Length31.00 ft
Grain SizeASTM Recommended Make Up Torque Maximum Make Up Torque 
Magnetic Permeability1.001max Slip RecessN/AElevator RecessN/A
Drift Size2 7/8"(2.875") Fluid Displacement Fluid capacity 
HardbandingNone Inspection CriteriaNS-2Elongation20%
IPC None 
Chemical PropertiesPhosphorus <0.05%
Sulphur <0.03%
Manufacturing CriteriaAPI Spec7-1
Drill Collar Capacities
Tensile Strength110,000 psi Minimum
758 Mpa
Yield Strength100,000 psi Minimum
689 Mpa
Impact StrengthAbove 60J
Hardness(Brinell)Minimum 285 BHN



Drill Collar Classification

Drill collars can be simply put into three categories according to their structure and material, namely the slick drill collar, the spiral grooved drill collar and the non-magnetic drill collar.
The slick drill collar is normally a smooth thicked-wall tube, with a thickness in the range of 38 to 53, about 4 to 8 times of that of the drill pipes. It is machined into a uniform cylindrical shape and made up of plain alloy steel.

The spiral grooved drill collar is also machined from plain alloy steel, but it is normally lighter by 4 to 6 percent than the slicker drill collar. This kind of drill collar is widely used nowadays because the special spiral design largely hold back of the possibility of sticking accidents by reducing the area of contact between the wall and the collar.

The non-magnetic drill collar is manufactured from the non-magnetic alloy steel. As the magnetic measuring instruments can sense the geomagnetic field when measuring the direction of the borehole, the instruments must be kept working in a non-magnetic environment. However, in drilling process, the magnetic rigs always affect the accuracy of the measuring instrument. Therefore, the utilization of a non-magnetic drill collar can ensure a more reliable measuring result.

Drill Collars in Drilling Application
Drill collars play a vital role in drilling process. Due to the structural features, drill collars can provide weight for drilling purpose, which is drill collar's one and foremost specialty. Gravity works on a number of drill collars to offer enough downward force needed to break rocks with the drill bit. 
Apart from providing weight on the bit (WOB), drill collars also work as a shock absorber to dampen the vibration and shaking when drilling takes place. In this way, the drilling process can be carried out in a much steadier state.
Thirdly, the presence of the drill collars allows the pipelines to stay in the tensile state, while guarantees the rigidity of the drill string under great compression. Thus, the drill efficiency and quality are greatly improved.
In addition to the above applications, drill collars can help to control the direction of the bottom hole assembly, avoiding the problem of hole deviation and enhancing the performance of drilling.
 
Non-Magnetic Spiral Drill Collars

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