API 7-1 DRILL COLLAR FOR WELL DRILLING

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Home > Product > API 7-1 DRILL COLLAR FOR WELL DRILLING
Product
API 7-1 DRILL COLLAR FOR WELL DRILLING
Posting date : Jul 23, 2015
Membership
Free Member Scince Jul 23, 2015
FOB Price
$600-1000
Min. Order Quantity
1PC
Supply Abillity
30000pc/month
Port
Chinese main port
Payment Terms
TT, LC
Package
STANDARD
Keyword :
Category
Contact
Lucky Hou
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Product Detail
Company Info
 
Quick Detail
Place of Origin
China [CN]
Brand Name
lake
Model Number
all size
HS-CODE
7304-22
Package & Delivery Lead Time
Package
STANDARD
Delivery Lead Time
30WORKING DAYS
Specifications
Type of Certification
API
Start Date (validity period)
0000-00-00
End Date (validity period)
0000-00-00
Detailed Description

Specifications

1)Low carbon steel,stainless steel 
2)First-class reputation from regular customer 
3)strict API-7-1 standard 
4)Delivery ontime 

API-7-1 Drill Collar

Specifacation:

The 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 ASTM A-370 mechanical properties. 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 the surface.

To ensure close tolerance bores, all drill collar bars are trepanned then drifted to API specifications. Bar surface finish is “as rolled” which is original mill finish.

CONNECTIONS:

All connections are precision-machined to API specifications. 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. All connections are phosphated to minimize galling during makeup and applied with thread storage compound. Thread protectors are installed to ensure adequate joint protection during shipment.

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 box end of the spiral collar is left uncut from 79 inches from box shoulder and the pin end is left uncut 30 inches from the pin shoulder.

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