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          • Drill Collar
          Name:Drill Collar
          Name:Drill Collar
          Standard:API 7-1
          Length:30ft/ 31ft
          Size:from 3 1/8
          Material:4145H
          Color:Blue
          Hardness:285-341HB
          Processing:Forging

          Product Description

          The drill collar is at the bottom of the drill string and is the main component of the lower drill assembly. Its main features are large wall thickness (generally 38 ~ 53mm, equivalent to 4-6 times the wall thickness of the drill pipe), and greater gravity and stiffness. In order to facilitate the work of lifting and lowering, elevator grooves and slip grooves can be processed on the outer surface of the internal thread of the drill collar. Made of forged AISI4145H chromium-molybdenum alloy steel to effectively control the chemical composition and trace element content.


          The effect of the drill collar:

          (1) Apply pressure to the drill bit;

          (2) Ensure the necessary strength under compression conditions;

          (3) Reduce the vibration, swing, and runout of the drill, and make the drill work smoothly;

          (4) Control well deviation.


          Drill collars are generally divided into three types: slick drill collars, spiral drill collars, and non-magnetic drill collars.

          (1) The slick drill collar is a smooth thick-walled round pipe, and the connecting threads are processed at both ends.

          (2) Spiral drill collars process three right-handed spiral grooves on the outer cylindrical surface of the circular collar to reduce the contact area with the well wall and effectively prevent pressure-drilling

          (3) Non-magnetic drill collar is mainly used for monitoring during oil drilling. The structure is the same as the overall drill collar. The non-magnetic drill collar is made of P530 or P550 alloy steel, which is forged after strict chemical composition analysis. The material's mechanical property test can ensure that the hardness, toughness, impact value and corrosion resistance meet the standards, and it has good low magnetic permeability and good machining performance.

          In order to facilitate the work of lifting and lowering, elevator grooves and slip grooves can be processed on the outer surface of the internal thread of the drill collar.

          Executive standard: API7-1

          Size

          O.D(mm)

          I.D.(mm)

          Code

          Thread

          Length(mm)

          Weight(kg)

          3-1/8

          79.4

          31.8(1-1/4)

          NC23-31

          NC23

          9140

          298

          3-1/2

          88.9

          38.1(1-1/2)

          NC26-35

          NC26

          9140

          364

          4-1/8

          104.8

          50.8(2)

          NC31-41

          NC31

          9140/9450

          474/490

          4-3/4

          120.6

          50.8(2)

          NC35-47

          NC35

          9140/9450

          674/697

          5

          127

          57.2(2-1/4)

          NC38-50

          NC38

          9140/9450

          725/749

          6

          152.4

          57.2(2-1/4)

          NC44-60

          NC44

          9140/9450

          1125/1163

          71.4(2-13/16)

          NC44-60

          9140/9450

          1022/1056

          6-1/4

          158.8 

          57.2(2-1/4)

          NC44-62

          NC44

          9140/9450

          1237/1279

          71.4(2-13/16)

          NC46-62

          9140/9450

          1134/1172

          6-1/2

          165.1

          57.2(2-1/4)

          NC46-65

          NC46

          9140/9450

          1352/1398

          71.4(2-13/16)

          NC46-65

          NC50

          9140/9450

          1249/1291

          6-3/4

          171.4

          57.2(2-1/4)

          NC46-67

          NC46

          9140/9450

          1471/1521

          7

          177.8

          57.2(2-1/4)

          NC50-70

          NC50

          9140/9450

          1597/1651

          71.4(2-13/16)

          NC50-70

          9140/9450

          1494/1545

          7-1/4

          184.2

          71.4(2-13/16)

          NC50-72

          NC50

          9140/9450

          1625/1680

          7-3/4

          196.8

          71.4(2-13/16)

          NC56-77

          NC56

          9140/9450

          1895/1960

          8

          203.2

          71.4(2-13/16)

          NC56-80

          NC56/6-5/8REG

          9140/9450

          2040/2109

          8-1/4

          209.6

          71.4(2-13/16)

          6-5/8REG

          6-5/8REG

          9140/9450

          2188/2263

          9

          228.6

          71.4(2-13/16)

          NC61-90

          NC61

          9140/9450

          2658/2748

          9-1/2

          241.3

          76.2(2-13/16)

          7-5/8REG

          7-5/8REG

          9140/9450

          2954/3054

          9-3/4

          247.6

          76.2(3)

          NC70-97

          NC70

          9140/9450

          3127/3234

          10

          254

          76.2(3)

          NC70-100

          NC70

          9140/9450

          3308/3421

          11

          279.4

          76.2(3)

          8-5/8REG

          8-5/8REG

          9140/9450

          4072/4210

          Mechanical properties:<7 inch Drill Collar:Yield Strength≥758MPa,Tensile Strength≥965MPa,Four times elongation≥13%,Impact energy Ak≥54J,(Single impact work≥47J,Average≥54J)Hardness range 285HB~341HB≥7inch Drill Collar:Yield Strength≥689MPa,Tensile Strength≥931MPa,Four times elongation≥13%,Impact energy Ak≥54J,(Single impact work≥47J,Average≥54J) Hardness range 285HB~341HB


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