Non Spiral Drill Collars
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Non Spiral Drill Collars
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Features
Basic Infomation
Place of Origin: China
Brand Name: ROSCHEN
Certification: API
Model Number: 6.750”, 8.75", 9.5"
High Light:

Magnetic Spiral Drill Collars

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Non Magnetic Spiral Drill Collars

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Drill Collars

Payment & Shipping Terms
Packaging Details: Wooden Box or Bundle
Supply Ability: 20000 sets/M
Specifications
Product Description

 

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 OD 6 3/4"(6.75") Connection NC50 Bend Stress Ratio  
Nominal ID 2.7/8"(2.875") OD 6 3/4" (6.75") ID 2 7/8"(2.875")
Material Grade P530 Adjusted Weight   Average Length 31.00 ft
Grain Size ASTM Recommended Make Up Torque   Maximum Make Up Torque  
Magnetic Permeability 1.001max Slip Recess N/A Elevator Recess N/A
Drift Size 3 1/8"(3.125") Fluid Displacement   Fluid capacity  
Hardbanding None Inspection Criteria NS-2 Elongation 18%
IPC None  
Chemical Properties Phosphorus <0.05%
Sulphur <0.03%
Manufacturing Criteria API Spec7-1
Drill Collar Capacities
Tensile Strength 120,000 psi Minimum
827 Mpa
Yield Strength 110,000 psi Minimum
758 Mpa
Impact Strength Above 60J
Hardness(Brinell) Minimum 285 BHN

 

Non-magnetic Spiral Drill Collar 8.250” 6 5/8” Reg

Specification   Tool Joint/Connection Specifications
Nominal OD 8 1/4"(8.25")   Connection 6 5/8" REG Bend Stress Ratio  
Nominal ID 2 13/16"(2.8125")   OD 8 1/4" (8.25") ID 2 13/16" (2.8125")
Material Grade P530   Adjusted Weight   Average Length 31.00 ft
Grain Size ASTM   Recommended Make Up Torque   Maximum Make Up Torque  
Magnetic Permeability 1.001max   Slip Recess N/A Elevator Recess N/A
Drift Size 2 11/16"(2.6875")   Fluid Displacement   Fluid capacity  
Hardbanding None   Inspection Criteria NS-2 Elongation 20%
IPC None  
Chemical Properties Phosphorus <0.05%
Sulphur <0.03%
Manufacturing Criteria API Spec7-1
Drill Collar Capacities
Tensile Strength 100,000 psi Minimum
689 Mpa
Yield Strength 110,000 psi Minimum
758 Mpa
Impact Strength Above 60J
Hardness(Brinell) Minimum 285 BHN

 

Non-magnetic Spiral Drill Collar 9.500” 7 5/8” Reg

Specification   Tool Joint/Connection Specifications
Nominal OD 9 1/2"(9.5")   Connection 7 5/8" REG Bend Stress Ratio  
Nominal ID 3"(3")   OD 9 1/2" (9.5") ID 3" (3")
Material Grade P530   Adjusted Weight   Average Length 31.00 ft
Grain Size ASTM   Recommended Make Up Torque   Maximum Make Up Torque  
Magnetic Permeability 1.001max   Slip Recess N/A Elevator Recess N/A
Drift Size 2 7/8"(2.875")   Fluid Displacement   Fluid capacity  
Hardbanding None   Inspection Criteria NS-2 Elongation 20%
IPC None  
Chemical Properties Phosphorus <0.05%
Sulphur <0.03%
Manufacturing Criteria API Spec7-1
Drill Collar Capacities
Tensile Strength 110,000 psi Minimum
758 Mpa
Yield Strength 100,000 psi Minimum
689 Mpa
Impact Strength Above 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.

 

 

For more information please contact:

 

Skype: ROSCHEN.TOOL , ROSCHEN_GROUP

WeChat: +86-137 6419 5009 ; +86-135 8585 5390

WhatsApp: +86-137 6419 5009 ; +86-135 8585 5390

Email: roschen@roschen.com ; roschen@roschen.net

 

Website: http://www.roschen.com ; http://www.roschen.net

 

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