ROSCHEN GROUP
| Packaging Details | wooden Box, Bundle |
| Brand Name | ROSCHEN |
| Model Number | 3.125inch 3.375inch |
| Certification | API |
| Place of Origin | China |
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Product Specification
| Packaging Details | wooden Box, Bundle | Brand Name | ROSCHEN |
| Model Number | 3.125inch 3.375inch | Certification | API |
| Place of Origin | China | ||
| High Light | Drill Collars ，Spiral Drill Collars ，Non Magnetic Drill Collars | ||
Drill Collars 3.125inch 3.375inch
Drill Collars
Command Tubular’s drill collars are made of modified AISI 4145H chromium molybdenum alloy steel. These drill collar bars are full-length heat treated and water quenched to obtain mechanical properties as specified by API Spec 7-1.
Full mechanical and chemical mill test certifications are supplied with all drill collars. These mill test certifications guarantee a hardness range of 285 to 341 BHN and an impact value of 40 ft-lbs at room temperature, one inch below surface.
All drill collar bars are trepanned then drifted to API specifications to ensure close tolerance bores. Drill collars are also supplied with the outer surface either machined or rough peeled.
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%.
Short nonmagnetic drill collars (SNMDCs):
SNMDCs are used between a mud motor and a mud collar to neutralize magnetic interference from the following.
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:
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
Company Details
Business Type:
Manufacturer,Distributor/Wholesaler,Exporter,Seller
Year Established:
1921
Total Annual:
5000-2000000
Employee Number:
100~500
Ecer Certification：
Verified Supplier
ROSCHEN GROUP ROSCHEN Group has the world class advanced equipment like 12000 tons forging, metal processing plant, heat treatment workshop, numerical control plant, Advanced five-axis machining center, etc. professional technical and skilled team to ensure mining, mine... ROSCHEN GROUP ROSCHEN Group has the world class advanced equipment like 12000 tons forging, metal processing plant, heat treatment workshop, numerical control plant, Advanced five-axis machining center, etc. professional technical and skilled team to ensure mining, mine...
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