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Laiwu Hengye Heavy Steel Forging Co., Ltd Non-magnetic Drill Collars

Posted at: Offers to Sell and Export | Posted on: Wed 20 Jan, 2010 3:22 am | Product Category: Drill collars [53]
laiwu hengye heavy steel forging co non magnetic drill collars
Products Photos CatalogLaiwu Hengye Heavy Photos Catalog

Laiwu Hengye Heavy Steel Forging CO., Ltd: Non-Magnetic Drill Collars are an integral heavy duty


that are constructed from a solid bar of austenitic stainless steel. Our non-magnetic drill collars are supplied with an "as rolled" surface finish condition. All non-magnetic collars are hot cold worked in order to provide them with the necessary mechanical and magnetic 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.

Here at Hengye Heavy Steel Forging CO., Ltd. we know not every project is the same, therefore requiring a variety of collars. All of our drill collars can be customized to suit your specific requirements by adding some of the features listed below.

Standard Sizes, Bores, and Connections

Drill Collar

Conn. Size & Type Min.

OD Bore Length Bending Strength

Ratio*** Drill Collar


(in.) (in.) (ft.) (lb / ft)

NC 38-50 (3-1/2 IF) 5 2-1/4 30 or 31 2.38:1 52.75

NC 46-65 (4 IF) 6-1/2 2-1/4 30 or 31 2.76:1 98.52

NC 50-70 (4 IF) 7 2-1/4 30 or 31 2.54:1 116.34

NC 50-70 (4 IF) 7 2-13/16 30 or 31 2.73:1 109.66

NC 56-80 8 2-13/16 30 or 31 3.02:1 149.30

6-5/8 REG. 8-1/4 2-13/16 30 or 31 2.93:1 160.19

7-5/8 REG. 9-1/2 3 30 or 31 2.81:1 217.83

8-5/8 REG. 11 3 30 or 31 2.84:1 296.00

Note: Other sizes and connections are available as well as any other optional features listed below

Standard Drill Collar Features & Options

API pin stress relief groove and box boreback

An API pin stress relief can be used on all drill collars and downhole tools. It

is a recommended option in situations where fatigue can occur as a result of

bending. By removing any unengaged threads in the high stress areas of the

drill collar connection, it is less likely to crack due to fatigue because the bending will take place in the area of the connection with smooth surfaces that are free of stress concentrations.

Internal bore treatment

This option generates a compression level of at least 60, 000 PSI at a given

depth. This provides the collar with an excellent resistance to stress corrosion



Three optional spiral grooves can be placed on the outer diameter of the collar

to allow the mud to circulate freely around the drill collar. This is to equalize

the pressure as well as to prevent a seal forming. This will help reduce any

chances of differential sticking.


An optional outside profile can be machined to reduce the collar rigidity if


Elevator and slip recesses

Optional slip and elevator recesses are available to improve handling and safety.

These two features can be used together or separately. These options are cut as per API recommended practice 7G.

Drill Collar OD Elevator Recess

od (er)

(in) Slip Recess

od (sr)

(in) Elevator Recess Radius (R)


4-1/8 3-11/16 3-3/4 1/8

4-3/4 4-1/4 4-3/8 1/8

5 4-1/2 4-5/8 1/8

6 5-3/8 5-1/2 1/8

6-1/4 5-5/8 5-3/4 1/8

6-1/2 5-7/8 6 1/8

6-3/4 6 6-1/4 3/16

7 6-1/4 6-1/2 3/16

7-1/4 6-1/2 6-3/4 3/16

7-3/4 7 7-1/4 3/16

8 7-1/4 7-1/2 3/16

8-1/4 7-1/2 7-3/4 3/16

9 8-1/8 8-1/2 1/4

9-1/2 8-5/8 9 1/4

9-3/4 8-7/8 9-1/4 1/4

10 9-1/8 9-1/2 1/4

11 10-1/8 10-1/2 1/4

These features are not recommended for collars with OD below 4-3/4"

Company Contact:

paotian photo
Contact Name: Mr. Jacky Kon
Company Name: LinSteel Group Co., Ltd.
Email: Email
MSN: Email
Tel: +86-352-8713666
Fax: +86-352-8713667
Street Address: Linsteel New District,
Linfen City, Shansxi Province, 286000, China
Website: http://www.steel-forge.com
Member name: paotian
Country: China-CN China
Member Since: 11 October 2009
Total Leads: 1784 paotian Import Export Business Leads
Business focus: Galvanized Steel Coil, Pre-painted Steel Coil, Cold Rolled Steel Coil, Gi Coil, Hot Dipped Galvanized Steel Coil, Color Coated Steel Coil
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Product Category: Drill collars [53]

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