offshore

CHINA XI’AN WELONG FOUNDRY is also the leading manufacture of drilling enquipments for oil field in China and abroad ,and our products include Drill collars, Kellys, Heavyweight pipes, Rotary subs, Pup joints, Stabilizers and Drill stem accessories and so on ,which are according to API 7 Spec .

Since its establishment ,WELONG has developed a strong international expertise in system design ,including innovative and cost-effective technologies design, and now large amount of our products are are being sold to America ,Netherlands ,Kuwait ,and United Arab Emirates ,etc.With best price and excellent quality ,we are gaining more and more customers in petroleum drilling industry from home and abroad.

Drill collars :

Materials: AISI 4145 H Modified Alloy Steel .and Non-magnetic material .

Condition :Rolled surface finished .

Hardness :285-341BHN

Mechanical property :

8 1/2”-6 7/8” OD :Minimum yield strength is 110 000 PSI.

7”-11”OD :Minimum yield is 100 000 PSI .

Stabilizers

Material :AISI 4145 H or AISI 4145 H Modified Alloy Steel

Condition :Rough machined with roughness for OD is Ra3.2 and for ID and other surfaces is Ra3.2 .

Hardness :285-341 BHN (1” below surface)

Kellys :

Include Square Kellys and Hexagonal Kellys

Material :AISI 4142H and AISI 4145 H

Hardness :285-341 BHN (1” below surface)

Impact value :Min 54 J

Condition :Bored and drifted according to API 7 Spec ,with connection machined .

Heavy weight drill pipes :

Material :4145 H Modified Alloy Steel .

Mechanical property :

3 1/2:-5” OD : Minimum yield strength is 110 000 PSI

5 1/2”-6 5/8”OD :Minimum yield strength is 100 000 PSI .

Material : AISI 4145 H Modified Alloy Steel

Condition : Bored and drifted according to API Specifications 7.

Mechanical property :

3 1/2:-5” OD : Minimum yield strength is 110 000 PSI

5 1/2”-6 5/8”OD :Minimum yield strength is 100 000 PSI .

Standard length :36” or 48”

Manufactured from drill collar material and drifted according to API 7 Spec requirements .