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Drill Collar
NC31-41(2 7/8IF)
Design Specifications
OD(mm) 104.8
ID(mm) 50.8
Length(mm) 9150
Operating Parameters
Chamfer Diameter(mm) 100.4
Thread Connection NC31-41(2 7/8IF)
Blending Ration 2.43:1

A TYPE AND B TYPE DRILL COLLAR

Type A

●Be Made of alloy steel and the cross sections of the inside and outside pipe are both round.


Type B

●Be Made of alloy steel and the outside pipe has spiral grooves.




OD(mm)Yield Stength MpaTensile Strength Mpa

Elongation %

Brinell Hardness HBImpact APV J
79.4-171.4≥758≥965≥13285-341≥54
177.8-279.4≥689≥930≥13285-341≥54


C TYBE NON-MAGNETIC DRILL COLLAR PROPERTY


Type C

●Made of stainless alloy steel with rather low magnetic permeability and the cross sections of the inside and outside pipe are both round.




OD(mm)Yield Stength MpaTensile Strength Mpa

Elongation %

Brinell Hardness HBImpact APV J
79.4-171.4≥758≥827≥18

177.6-279.4≥689≥758≥20


Drill Collar

Drill  collaris a component of a drill string that provides weight on bit fordrilling. Thiskind of trenchless tool is a thick-walled tubular piece that  is machined from a solid bar of steel,usually plain carbon steel but sometimes ofnonmagnetic nickel-copper alloy orother nonmagnetic premium alloys. The solidbar is quenched and tempered toobtain the required mechanical properties, thentrepanned, drifted and threaded.Located at the bottom of the drill string,drill collar is a major component ofbottom hole assembly. The maincharacteristic of this trenchless tool is thickwall (It is generally between38 mm to 53 mm and is equivalent to 4 to 6 timesof that of drill pipe), largergravity and stiffness.

ProductionFeatures:
Superior-qualitygreenpipe&Advanced heat treatment process-HighStrength&hightoughness(especiallyunder low temperature)
Tomeet or exceed requirements of the API 7-1,API 7g&IS09001
Equippedwith advanced inspection instruments and a strictly enforced qualitycontrollingsystem,the final products are guaranteed to be of superiorandstablequality.
Due  to our qrofessional technicians&productflexibility,we are capable of meetingsome customer' s specific requirements.


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Superior Quality Products


Download PDF :
NC31-41(2 7/8IF)

Drill Collar thread type:NCXX-Numbered connection style,IF-Internal-flush style,REG-Regular style.


Bend strength ratio:the ratio of inner thread risk profile bending secction modulus and outer thread risk profile bending section modulus.

NC50-67(4 1/2IF)only applies to C-collar.




●Drill Collar&Heavy Weight Drill Pipe Processing Equipment

①Straightening Machine②Bore Drilling Machine

③NC Spiral Groove Milling Machine


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