Roschen  Global

PRODUCTS

Home / Products / Drill Pipe / DTH Drill Rods / NON-Magnetic Drill Collar FLEXI Collar 6.75inch 8inch

CATEGORIES

NEWS

Share to:

NON-Magnetic Drill Collar FLEXI Collar 6.75inch 8inch

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.
Availability:
Quantity:
  • NON-Magnetic Drill Collar 6.75inch 8inch
  • ROSCHEN
  • ROS-DC-NM 6.75/8 ...

Product Description


NON-Magnetic Drill Collar FLEXI Collar  6.75inch 8inch


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.

NON-MAGNETIC   DRILL COLLAR 4.75” NC38 FLEXI COLLAR

Specification



Nominal OD

4   3/4"(4.75")

Nominal ID

2   11/16"(2.685")

Matrial Grade

P530

Grain Size

3-5 ASTM

Magnetic   Permeability

1.001max.

Drift Size

2   9/16"(2.5625")

IPC

None

Chemical Properties

Phosphorus

<0.05%

Sulphur

<0.03%

Average Weight   Per Joint



Manufacturing   Criteria

API Spec7-1


Drill Collar   Capacities

Tensile Strength

130.5 KSI

120 KSI Min

Yield Strength

121.4 KSI

110 KSI Min

Impact Strength

171 IB/ft

Charpy V Notch

Hardness(Brinell)

311-321 BHN

 

Tool   Joint/Connection Specifications

Connection

NC38



OD

4   3/4"(4.75")

ID

2   11/16"(2.6875")

Adjusted Weight


Average Length

31.00 ft

Tensile Strength

587300Ibs

Torsional   Strength

18100Ib/ft

Recommended Make   Up Torque

9700Ib/ft

Maximum Make Up   Torque


Elongation

18%

Fluid   Displacement


Fluid Capacity

0.360 gal/ft

Elevator Recess

n/a

Slip Recess

n/a

Inspection   Criteria

NS-2

 

 

NON-MAGNETIC   DRILL COLLAR 6.500” NC50 FLEXI COLLAR

Specification



Nominal OD

6   1/2"(6.5")

Nominal ID

3   1/4"(3.25")

Matrial Grade

P530

Grain Size

1-2 ASTM

Magnetic   Permeability

1.001max.

Drift Size

3   1/8"(3.125")

IPC

None

Chemical   Properties

Phosphorus

<0.05%

Sulphur

<0.03%

Average Weight   Per Joint



Manufacturing   Criteria

API Spec7-1


Drill Collar   Capacities

Tensile Strength

128.1 KSI

120 KSI Min

Yield Strength

119.2 KSI

110 KSI Min

Impact Strength

181 Ib/ft

Charpy V Notch

Hardness(Brinell)

296-303 BHN

 

Tool   Joint/Connection Specifications

Connection

NC50



OD

6   1/2"(6.5")

ID

3   1/4"(3.25")

Adjusted Weight


Average Length

31.00 ft

Tensile Strength

560,800Ibs

Torsional   Strength

71,240Ib/ft

Recommended Make   Up Torque

26700Ib/ft

Maximum Make Up   Torque


Elongation

18%

Fluid   Displacement


Fluid Capacity

0.698 gal/ft

Elevator Recess

n/a

Slip Recess

n/a

Inspection   Criteria

NS-2

 

NON-MAGNETIC   DRILL COLLAR 6.750” NC50 FLEXI COLLAR

Specification



Nominal OD

6   3/4"(6.75")

Nominal ID

3   1/4"(3.25")

Matrial Grade

P530

Grain Size

2-4 ASTM

Magnetic   Permeability

1.001max.

Drift Size

3   1/8"(3.125")

IPC

None

Chemical   Properties

Phosphorus

<0.05%

Sulphur

<0.03%

Average Weight   Per Joint



Manufacturing   Criteria

API Spec7-1


Drill Collar   Capacities

Tensile Strength

132.9 KSI

120 KSI Min

Yield Strength

123.7 KSI

110 KSI Min

Impact Strength

170 Ib/ft

Charpy V Notch

Hardness(Brinell)

306-316 BHN

 

Tool   Joint/Connection Specifications

Connection

NC50



OD

6   3/4"(6.75")

ID

3   1/4"(3.25")

Adjusted Weight


Average Length

31.00 ft

Recommended Make   Up Torque


Maximum Make Up   Torque


Elongation

18%

Fluid   Displacement


Fluid Capacity


Elevator Recess

n/a

Slip Recess

n/a

Inspection   Criteria

NS-2

 

NON-MAGNETIC   DRILL COLLAR 8.000” 6-5/8” REG FLEXI COLLAR

Specification



Nominal OD

8"(8")

Nominal ID

3   1/2"(3.5")

Matrial Grade

P530

Grain Size

3-4 ASTM

Magnetic   Permeability

1.001max.

Drift Size

3   3/8"(3.325")

IPC

None

Chemical   Properties

Phosphorus

<0.05%

Sulphur

<0.03%

Average Weight Per   Joint



Manufacturing   Criteria

API Spec7-1


Drill Collar   Capacities

Tensile Strength

130.5 KSI

120 KSI Min

Yield Strength

120.5 KSI

100 KSI Min

Impact Strength

146 Ib/ft

Charpy V Notch

Hardness(Brinell)

298-302 BHN

 

Tool Joint/Connection   Specifications

Connection

6 5/8" REG



OD

8"(8")

ID

3   1/2"(3.5")

Adjusted Weight


Average Length

31.00 ft

Recommended Make   Up Torque


Maximum Make Up   Torque


Elongation

20%

Fluid   Displacement


Fluid Capacity


Elevator Recess

n/a

Slip Recess

n/a

Inspection   Criteria

NS-2

 

NON-MAGNETIC   DRILL COLLAR 8.250” 6-5/8” REG FLEXI COLLAR

Specification



Nominal OD

8   1/4"(8.25")

Nominal ID

3   1/2"(3.5")

Matrial Grade

P530

Grain Size

ASTM

Magnetic   Permeability

1.001max.

Drift Size

3   3/8"(3.325")

IPC

None

Chemical   Properties

Phosphorus

<0.05%

Sulphur

<0.03%

Average Weight   Per Joint



Manufacturing   Criteria

API Spec7-1


Drill Collar   Capacities

Tensile Strength

110,000 psi min

758 Mpa min

Yield Strength

100,000 psi min

689 Mpa min

Impact Strength

above 60J ft/Ibs

Hardness(Brinell)

285 BHN Minimum

 

Tool   Joint/Connection Specifications

Connection

6 5/8" REG



OD

8   1/4"(8.25")

ID

3   1/2"(3.5")

Adjusted Weight


Average Length

31.00 ft

Recommended Make   Up Torque


Maximum Make Up   Torque


Elongation

20%

Fluid   Displacement


Fluid Capacity


Elevator Recess

n/a

Slip Recess

n/a

Inspection   Criteria

NS-2

Non-magnetic drilling tools include Non-Magnetic Drill Collar/Flex Collar, Stabilizer, MWD components etc.

     The material is high purity austenitic stainless steel.

     Strict control of chemical composition and special forging process guarantee the excellent mechanical properties of Non-magnetic drilling tools.

  1. Corrosion resistance specification, all Non-magnetic drill collars can pass the corrosion test specified in ASTM A 262 Practice E.

  2. Non Magnetic Properties:

    1)       Relative Permeability: Max 1.005

    2)       Hot Spot / Field Gradient :MAX ±0.05μT

    3)       Special Treatment on ID: Roller Burnishing.

  3. Advantages are as following:

      1) Increase the corrosion resistance properties;

      2) Increase the surface hardness of bore up to HB400;

      3) Increase surface finish of bore to Ra≤3.2 μm

   4.  Test and Inspection carried out on each bar during production of NMDC, Stabilizer and MWD parts:

      1) Chemical Composition;

      2) Tensile Test;

      3) Impact Test;

      4) Hardness Test;

      5) Metallographic Test (Grain Size);

      6) Corrosion Test (According to ASTM A 262 Practice E);

      7) Ultrasonic Test over the whole length of the bar (According to ASTM A 388);

      8) Relative magnetic permeability Test;

      9) Hot spot Test

      10) Dimension Inspection

      Etc


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


Previous: 
Next: 

QUICK LINKS

CONTACT US

Add: 65 EAST XINHUAN ROAD, SHANGHAI, CHINA
Tel: +86-21-54994419
Fax: +86-21-54380177
Whatsapp/WeChat: +86-13764195009

SALES TEAM LEADERS

Dr.Robert Roschen  /  Bill / Phiger  /  Rebecca
KEEP IN TOUCH
Copyright © 2019 Roschen Group Limited. All Rights Reserved