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Spiral Drill Collars 8inch 8.25inch 9.5inch

Spiral Drill Collars

The spiral cut is added to a drill collar to prevent the likelihood of differential wall-sticking by reducing wall contact between the drill collar and the wall of the hole. The spiralling starts 22” from the bottom of the slip recess or 79” from the box end and ends 30” from the pin end. Adding spiralling to drill collars reduces the weight by approximately 4%.
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  • Spiral Drill Collars 8inch 8.25inch 9.5inch
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Product Description


 Spiral Drill Collars  8inch 8.25inch 9.5inch


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.

 

Drill collar Connections

All connections are precision-machined to API Spec 7-2 requirements.  API relief groove pin and bore back box stress relief are available on request. Thread roots are cold-worked to offer a greater resistance to fatigue.  At Command Tubular all connections are phosphate coated to minimize galling during makeup and thread storage compound is applied.  Thread protectors are installed to ensure adequate joint protection during shipment.  

 

InterDril Spiral Well Test Drill Collar 4.750” x 45.00 lb/ft PH 6 Range 2

Specification

Tool   Joint/Connection Specifications

Nominal OD

4   3/4"(4.75")

Connection

PH6

Bend Stress   Ratio


Nominal ID

2.25"

OD

4   3/4"(4.75")

ID

2.563"

Steel Grade

AISI 4145H   Modified

Adjusted Weight

45.1 lb/ft

Average Length

31.00 ft

Nominal wall   weight

45.00#

Tensile Strength

362,000lbs

Torsional   Strength


Nominal wall   thickness


Minimum Make Up   Torque

6500 Ib/ft

Maximum Make Up   Torque

8800 lb/ft

Drift Size

2.125"

Fluid   Displacement


Fluid capacity


IPC

None

Slip Recess

Special

Elevator Recess

Special

Pin Length

n/a

Inspection   Criteria

NS-2



Box Length

n/a


Average weight   per joint

1398lbs(635kgs)

Manufacturing   Criteria

API Spec7-1

 

InterDril Spiral Drill Collar 4.750” x 45.00 lb/ft WT38 Range 2

Specification

Tool   Joint/Connection Specifications

Nominal OD

4   3/4"(4.75")

Connection

WT38

Bend Stress   Ratio

1.42

Nominal ID

2.25"

OD

4   3/4"(4.75")

ID

2.563"

Steel Grade

AISI 4145H   Modified

Adjusted Weight

45.1 lb/ft

Average Length

31.00 ft

Nominal wall   weight

45.00#

Tensile Strength

846,000lbs

Torsional   Strength

32000

Nominal wall   thickness


Minimum Make Up   Torque

9000 Ib/ft

Maximum Make Up   Torque


Drift Size

2.125"

Fluid   Displacement


Fluid capacity


IPC

None

Inspection   Criteria

NS-2



Pin Length

n/a


Box Length

n/a

Average weight   per joint

1398lbs(635kgs)

Manufacturing   Criteria

API Spec7-1

 

 

InterDril Spiral Drill Collar 4.750” 45.00 lb/ft NC38 Range 2

Specification

Tool   Joint/Connection Specifications

Nominal OD

4   3/4"(4.75")

Connection

NC38

Bend Stress   Ratio

1.42

Nominal ID

2.25"

OD

4   3/4"(4.75")

ID

2.563"

Steel Grade

AISI 4145H   Modified

Adjusted Weight

45.1 lb/ft

Average Length

31.00 ft

Nominal wall   weight

45.00#

Tensile Strength

725,000lbs

Torsional   Strength

32000

Nominal wall thickness


Minimum Make Up   Torque

8790Ib/ft

Maximum Make Up   Torque


Drift Size

2.125"

Slip Recess

Yes

Elevator Recess

Yes

IPC

None

Fluid   Displacement

0.815 Gal/ft

Fluid capacity


Pin Length

n/a

Inspection   Criteria

NS-2



Box Length

n/a


Average weight   per joint

1398lbs (635kgs)

Manufacturing   Criteria

API Spec7/NS-1

Drill Collar   Capacities


Cross Section   Area Body(in²)

13.744

Cross Section   Area OD(in²)

17.721

Cross Section   Area ID(in²)

3.976

Section   Modulus(in³)

11.769

Polar Section   Modulus(in³)

19.984

 

JSH Spiral Drill Collar 4.750” x 49.79 lb/ft NC38 Range 2

Specification

Tool   Joint/Connection Specifications

Nominal OD

4   3/4"(4.75")

Connection

NC38

Bend Stress   Ratio

2.217

Nominal ID

2   1/4"(2.25")

OD

4   3/4"(4.75")

ID

2.25"

Steel Grade

AISI 4145H   Modified

Adjusted Weight

49.79 lb/ft

Average Length

31.00 ft

Nominal wall   weight


Tensile Strength

625,000lbs

Torsional   Strength

17500

Nominal wall   thickness


Minimum Make Up   Torque

8790Ib/ft

Maximum Make Up   Torque

11000

Drift Size

2.125"

Slip Recess

Yes

Elevator Recess

No

IPC

None

Fluid   Displacement


Fluid capacity


Pin Length

n/a

Inspection   Criteria

NS-2



Box Length

n/a


Average weight   per joint

1543lbs (700kgs)

Manufacturing   Criteria

API Spec7/NS-1

Drill Collar Capacities


Cross Section   Area Body(in²)

13.744

Cross Section   Area OD(in²)

17.721

Cross Section   Area ID(in²)

3.976

Section   Modulus(in³)

9.992

Polar Section   Modulus(in³)

19.984

 

InterDril Spiral Drill Collar 6.500” x 87.35 lb/ft NC50 Range 2

Specification

Tool   Joint/Connection Specifications

Nominal OD

6   1/2"(6.5")

Connection

NC50

Bend Stress   Ratio

2.03

Nominal ID

2   13/16"(2.8125")

OD

6   1/2"(6.5")

ID

2 13/16"   (2.8125")

Steel Grade

AISI 4145H   Modified

Adjusted Weight

87.35 lb/ft

Average Length

31.00 ft

Nominal weight

87.00#

Tensile Strength

1392400lbs

Torsional   Strength

52000

Nominal wall   thickness

1.844"

Minimum Make Up   Torque

29700Ib/ft

Maximum Make Up   Torque

32000 lb/ft

Drift Size

2   11/16"(2.6875")

Slip Recess

Yes

Elevator Recess

No

IPC

None

Fluid   Displacement

1.33Gal/ft

Fluid capacity

0.32 Gal/ft

Pin Length

n/a

Inspection   Criteria

NS-2



Box Length

n/a


Average weight   per joint

1543lbs (700kgs)

Manufacturing   Criteria

API Spec7/NS-1

Drill Collar   Capacities


Cross Section   Area Body(in²)

26.97

Cross Section   Area OD(in²)

33.183

Cross Section   Area ID(in²)

6.213

Section   Modulus(in³)

26.016

Polar Section   Modulus(in³)

52.032

 

JSH Spiral Drill Collar 6.500” x 87.35 lb/ft NC50 Range 2

Specification

Tool Joint/Connection   Specifications

Nominal OD

6   1/2"(6.5")

Connection

NC50

Bend Stress   Ratio

2.242

Nominal ID

2   13/16"(2.8125")

OD

6   1/2"(6.5")

ID

2 13/16"   (2.8125")

Steel Grade

AISI 4145H   Modified

Adjusted Weight

87.35 lb/ft

Average Length

31.00 ft

Nominal weight

86.79#

Tensile Strength

1259311lbs

Torsional   Strength

51823

Nominal wall   thickness

1.844"

Minimum Make Up   Torque

29445Ib/ft

Maximum Make Up   Torque

32389 lb/ft

Drift Size

2   11/16"(2.6875")

Slip Recess

Yes

Elevator Recess

No

IPC

None

Fluid   Displacement

1.33Gal/ft

Fluid capacity

0.32 Gal/ft

Pin Length

n/a

Inspection   Criteria

NS-2



Box Length

n/a


Average weight   per joint

2708lbs (1231kgs)

Manufacturing   Criteria

API Spec7/NS-1

Drill Collar   Capacities


Cross Section   Area Body(in²)

26.97

Cross Section   Area OD(in²)

33.183

Cross Section   Area ID(in²)

6.213

Section   Modulus(in³)

26.016

Polar Section   Modulus(in³)

52.032

 

VAM Drilling Spiral Drill Collar 6.500” x 87.35 lb/ft NC50 Range 2

Specification

Tool   Joint/Connection Specifications

Nominal OD

6   1/2"(6.5")

Connection

NC50

Bend Stress   Ratio

2.03

Nominal ID

2   13/16"(2.8125")

OD

6   1/2"(6.5")

ID

2 13/16"   (2.8125")

Steel Grade

AISI 4145H   Modified

Adjusted Weight

87.35 lb/ft

Average Length

31.00 ft

Nominal weight

87.00#

Tensile Strength

1392400lbs

Torsional   Strength

52500

Nominal wall   thickness

1.844"

Minimum Make Up   Torque

29700Ib/ft

Maximum Make Up   Torque

32000 lb/ft

Drift Size

2   11/16"(2.6875")

Slip Recess

Yes

Elevator Recess

Yes

IPC

None

Fluid   Displacement

1.33Gal/ft

Fluid capacity

0.32 Gal/ft

Pin Length

n/a

Inspection   Criteria

NS-2



Box Length

n/a


Average weight   per joint

2708lbs (1231kgs)

Manufacturing   Criteria

API Spec7/NS-1

Drill Collar   Capacities


Cross Section   Area Body(in²)

26.97

Cross Section   Area OD(in²)

33.183

Cross Section   Area ID(in²)

6.213

Section   Modulus(in³)

26.016

Polar Section   Modulus(in³)

52.032

 

JSH Spiral Drill Collar 8.000” x 120.00 lb/ft 6 5/8 ” REG Range 2

Specification

Tool   Joint/Connection Specifications

Nominal OD

8"(8")

Connection

6 5/8" API   Regular

Bend Stress   Ratio

2.6

Nominal ID

2   13/16"(2.8125")

OD

8"(8")

ID

2 13/16"   (2.8125")

Steel Grade

AISI 4145H   Modified

Adjusted Weight

122.38 lb/ft

Average Length

31.00 ft

Nominal weight

120#

Tensile Strength

1683400lbs

Torsional   Strength

78700

Nominal wall   thickness


Minimum Make Up   Torque

49200Ib/ft

Maximum Make Up   Torque

54100 lb/ft

Drift Size

2   11/16"(2.6875")

Slip Recess

Yes

Elevator Recess

No

IPC

None

Fluid   Displacement


Fluid capacity


Pin Length

n/a

Inspection   Criteria

NS-2



Box Length

n/a


Average weight   per joint

3793lbs (1720kgs)

Manufacturing   Criteria

API Spec7/NS-1

Drill Collar   Capacities


Cross Section   Area Body(in²)

44.053

Cross Section   Area OD(in²)

50.265

Cross Section Area   ID(in²)

6.213

Section   Modulus(in³)

49.498

Polar Section   Modulus(in³)

98.995

 

Subdrill Spiral Drill Collar 8.000” x 144.00 lb/ft 6 5/8 ” REG Range 2

Specification

Tool   Joint/Connection Specifications

Nominal OD

8"(8")

Connection

6 5/8" API Regular

Bend Stress   Ratio

2.3

Nominal ID

2   13/16"(2.8125")

OD

8"(8")

ID

2 13/16"   (2.8125")

Steel Grade

AISI 4145H   Modified

Adjusted Weight

144 lb/ft

Average Length

31.00 ft

Nominal weight

144#

Tensile Strength

1834500lbs

Torsional   Strength

85500 lb/ft

Nominal wall   thickness


Recommended Make   Up Torque

8790 Ib/ft

Maximum Make Up   Torque


Drift Size

2   11/16"(2.6875")

Slip Recess

Yes

Elevator Recess

Yes

IPC

None

Fluid   Displacement


Fluid capacity


Pin Length

n/a

Inspection   Criteria

NS-2



Box Length

n/a


Average weight   per joint

4464lbs (2029kgs)

Manufacturing   Criteria

API Spec7

Drill Collar   Capacities


Cross Section   Area Body(in²)


Cross Section   Area OD(in²)


Cross Section   Area ID(in²)


Section   Modulus(in³)


Polar Section Modulus(in³)


 

VAM Drilling Spiral Drill Collar 8.000” x 144.00 lb/ft 6 5/8” REG Range 2

Specification

Tool   Joint/Connection Specifications

Nominal OD

8"(8")

Connection

6 5/8" API   Regular

Bend Stress   Ratio

2.3

Nominal ID

2   13/16"(2.8125")

OD

8"(8")

ID

2 13/16"   (2.8125")

Steel Grade

AISI 4145H   Modified

Adjusted Weight

149.6 lb/ft

Average Length

31.00 ft

Nominal weight

144#

Tensile Strength

1834500 lbs

Torsional   Strength

85500 lb/ft

Nominal wall   thickness


Recommended Make   Up Torque

53300 Ib/ft

Maximum Make Up   Torque


Drift Size

2   11/16"(2.6875")

Slip Recess

Yes

Elevator Recess

Yes

IPC

None

Fluid   Displacement


Fluid capacity


Pin Length

n/a

Inspection   Criteria

NS-2



Box Length

n/a


Average weight   per joint

4638 lbs (2029kgs)

Manufacturing   Criteria

API Spec7

Drill Collar   Capacities


Cross Section   Area Body(in²)


Cross Section   Area OD(in²)


Cross Section   Area ID(in²)


Section   Modulus(in³)

49.498

Polar Section   Modulus(in³)


 

JSH Spiral Drill Collar 8.250” x 130.50 lb/ft JSH 6 5/8” REG Range 2

Specification

Tool   Joint/Connection Specifications

Nominal OD

8   1/4"(8.25")

Connection

6 5/8" API   Regular

Bend Stress   Ratio

3.211

Nominal ID

2   13/16"(2.8125")

OD

8   1/4"(8.25")

ID

2 13/16"   (2.8125")

Steel Grade

AISI 4145H   Modified

Adjusted Weight

130.5 lb/ft

Average Length

31.00 ft

Nominal weight


Tensile Strength

1683400 lbs

Torsional   Strength

78700 lb/ft

Nominal wall   thickness


Recommended Make   Up Torque

53300 Ib/ft

Maximum Make Up   Torque

55630

Drift Size

2   11/16"(2.6875")

Slip Recess

Yes

Elevator Recess

No

IPC

None

Fluid   Displacement

2.32 US Gal/ft   closed end

Fluid capacity

0.32

Pin Length

n/a

Inspection   Criteria

NS-2



Box Length

n/a


Average weight   per joint

4045 lbs (1834kgs)

Manufacturing   Criteria

API Spec7

Drill Collar   Capacities


Cross Section   Area Body(in²)

47.244

Cross Section   Area OD(in²)

53.456

Cross Section   Area ID(in²)

6.213

Section   Modulus(in³)

54.382

Polar Section   Modulus(in³)

54.382

 

JSH Spiral Drill Collar 9.500” x 160.82 lb/ft 7 5/8” REG Range 2

Specification

Tool   Joint/Connection Specifications

Nominal OD

9   1/2"(8.5")

Connection

7 5/8" API   Regular

Bend Stress   Ratio

3.061

Nominal ID

3"(3")

OD

9   1/2"(9.5")

ID

3"   (3")

Steel Grade

AISI 4145H   Modified

Adjusted Weight

160.82 lb/ft

Average Length

31.00 ft

Nominal weight


Tensile Strength

2459,066 lbs

Torsional   Strength

132036 lb/ft

Nominal wall   thickness

3.250"

Recommended Make   Up Torque

53300 Ib/ft

Maximum Make Up   Torque

90775

Drift Size

2.875"

Slip Recess

Yes

Elevator Recess

Yes

IPC

None

Fluid   Displacement

2.86 US Gal/ft   closed end

Fluid capacity

0.37

Pin Length

n/a

Inspection   Criteria

NS-2



Box Length

n/a


Average weight   per joint

4985lbs (2261kgs)

Manufacturing Criteria

API Spec7

Drill Collar   Capacities


Cross Section   Area Body(in²)

63.814

Cross Section   Area OD(in²)

70.882

Cross Section   Area ID(in²)

7.069

Section   Modulus(in³)

83.336

Polar Section   Modulus(in³)

166.671

 

Spiral Drill Collars

 

The spiral cut is added to a drill collar to prevent the likelihood of differential wall-sticking by reducing wall contact between the drill collar and the wall of the hole.  The spiralling starts 22” from the bottom of the slip recess or 79” from the box end and ends 30” from the pin end.  Adding spiralling to drill collars reduces the weight by approximately 4%.

 

Non-Magnetic Drill Collars

 

Command Tubular’s non-magnetic drill collars are an integral heavy duty joint that are constructed from a solid bar of austenitic stainless steel. Our non-magnetic drill collars are supplied with a machined surface finish condition.

 

All non-magnetic collars are hot/cold worked in order to provide them with the necessary mechanical properties. The bars are then trepanned, hot spot inspected and machined. An internal bore treatment is performed on the full length in order to achieve the proper compressive status of the internal diameter.

 

This provides the collar with optimal resistance to stress corrosion cracking. All of our drill collars are manufactured in accordance with API spec 7, Q1 and recommended practice 7G as applicable.


For more information please contact:

ROSCHEN INC.
ROSCHEN GROUP LIMITED
ROSCHEN HOLDINGS LIMITED

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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