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Drill Collar

  Drill collar is used between drill pipe and drill bit in the drill stem. It is used to put weight on the bit so that the bit can drill. Lake Petros drill collars are made of AISI 4145H or 4145H modified alloy steel. Its bores are trepanned from one direction with no mismatch. All drill collars are Q&T overall length. Lake Petro not only provides slick Drill Collars, but also spiral Drill Collars with slip, elevator recesses and hard banding upon clients option. Our drill collars are available in lengths from 10 to 45 feet and outside diameter from 3-1/8" to 11".
  Lake Petro also makes high torque threads such as Double shoulder NC31,NC38,NC46,NC50 and 5-1/2FH specified by clients. Our non-magnetic drill collars are made from chrome manganese low carbon austenitic alloy, which has following characteristics: The chemical composition should be controlled strictly during the refining and forging process. With excellent lower Magnetic permeability, high strength of mechanical properties and outstanding resistant to stress corrosion cracking and no tendency to galling.
API threading connection  All API connections comply with dimensional requirements specified in API Spec. 7 latest edition and guidelines presented in API RP7G Latest Edition.
Anti-Galling treatment  All drill collar threads would be phosphatized or copperized in order to lower the possibility of connection galling.
Stress Relieve Recess  API pin stress relief groove and box bore back feature, which can reduce stress in the thread roots and significantly improve the connection fatigue life, are optional on drill collars if orders and inquiries specified. As indicated in API Spec. 7-1 latest edition, connections NC23, NC26 (2 3/8 IF) and NC31 (2 7/8 IF) have no enough metal to accommodate stress relief features.

Material AISI 4145 mod. 

Non-magnetic Material Stainless steels

Drill Collar Diameter

inch (mm)

  6 7/8 (175)

 > 6 7/8 (175)

 6 7/8 (175)

 > 6 7/8 (175)

Yield Strength

ksi (MPa)

 110 (760)

 100 (690)

 110 (760)

 100 (690)

Tensile Strength

ksi (MPa)

145 C 165

(970 - 1150)

135 C 160

(931 - 1100)

 120 (830)

 110 (760)

Elongation Lo = 4 do 

%

 15

 18

 20

Reduction of Area

%

 45

-

Impact Test - longitudinal 

ftlbs

Joule

40 / 35

54 / 47

40 / 35

54 / 47

Impact Test - transversal

ftlbs

Joule

20 / 18

28 / 24

18 / 16

25 / 22

-

Hardness at Test Diameter

HB

290 - 340

285 - 325

each, for information only

 

 
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