Oilfield Tubular

Drill Collar

OD: 3 1/8"-11"

Length: 30ft / 31ft / 43ft / r1~r3

Standard: api 5dp/api spec 7-1 e75,x95,g105,s135

Connection Type: nc, reg, fh, if

Thread: nc26, nc31, nc38, nc40, nc46, nc50,5.1 / 2fh

Material: stainless steel / alloy steel /carbon steel / 4145h

Classification: non magnetic drill collar, slick drill collar, spiral drill collar,square drill collars, monel drill collar, pony drill collar, spesifikasi drill collar

Application: oil and gas well drilling, oilfield drilling, mine blasting, water well drilling, geothermal wells drilling, fore poling, coal and nonferrous metal mining projects

Specification

Non magnetic drill collars are one of the parts of a drill’s string. Drill for the Collars is meant to provide weight for drilling purposes. The Drill Collars are thick walled tube like pieces that are machined from solid steel bars, although they are often made from plain carbon steel or the non magnetic alloy of copper and steel or other premium alloys that are non magnetic in nature. Drill collar has bars of solid steel that are drilled from one end to the other to provide a passage for pumping the drilling fluids through the collar.


Collars that are available for drilling have an external diameter that is made of steel and can be slightly machine perfected for making sure of the roundedness. Drill Collars are sometimes perfected with the help of spiral drill collars or helical shaped grooves. Drill threaded collar have connections that are male or one end and female on the other and. These are cut into a multiple collar that can be adjusted with screw along with other down hole tools. Drill helps make a bottom hole assembly or BHA.


Drill Collar Number*

Outside Diameter,
in.

Inside Diameter,
in.

Length,
ft

Approximate Weight,
lb/ft

Typical Bending
Strength Ratio

NC 23-31

3-1/8

1-1/4

30

22

2.57:1

NC 26-35 (2-3/8 IF)

3-1/2

1-1/2

30

27

2.42:1

NC 31-41 (2-7/8 IF)

4-1/8

2

30 or 31

34

2.43:1

NC 35-47

4-3 /4

2

30 or 31

47

2.58:1

NC 38-50 (3-1/2 IF)

5

2-1/4

30 or 31

54

2.38:1

NC 44-60

6

2-1/4

30 or 31

83

2.49:1

NC 44-60

6

2-13 /16

30 or 31

76

2.84:1

NC 44-62

6-1/4

2-1/4

30 or 31

91

2.91:1

NC 46-62 (4 IF)

6-1/4

2-13 /16

30 or 31

84

2.63:1

NC 46-65 (4 IF)

6-1/2

2-1/4

30 or 31

100

2.76:1

NC 46-65 (4 IF)

6-1/2

2-13 /16

30 or 31

93

3.05:1

NC 46-67 (4 IF)

6-3 /4

2-1/4

30 or 31

109

3.18:1

NC 50-70 (4-1/2 IF)

7

2-1/4

30 or 31

118

2.54:1

NC 50-70 (4-1/2 IF)

7

2-13 /16

30 or 31

111

2.73:1

NC 50-72 (4-1/2 IF)

7-1/4

2-13 /16

30 or 31

120

3.12:1

NC 56-77

7-3 /4

2-13 /16

30 or 31

140

2.70:1

NC 56-80

8

2-13 /16

30 or 31

151

3.02:1

6-5/8 API Reg

8-1/4

2-13 /16

30 or 31

162

2.93:1

NC 61-90

9

2-13 /16

30 or 31

196

3.17:1

7-5/8 API Reg

9-1/2

3

30 or 31

217

2.81:1

NC 70-97

9-3 /4

3

30 or 31

230

2.57:1

NC 70-100

10

3

30 or 31

243

2.81:1

8-5/8 API Reg

11

3

30 or 31

300

2.84:1


O.D.

cutting depth

Lead ±25.4

mm

in

A(mm)

B(mm)

mm

86

3.375

3.5±0.79

/

679

98.4

3.875

4.0±0.79

/

914

101.6~111.1

4~4 1/8

4.8±0.79

/

914

114.3~130.2

4 1/2~5 1/8

5.6±0.79

/

965

133.4~146.1

5 1/4~5 3/4

6.4±0.79

/

1067

149.2~161.9

5 7/8~6 3/8

7.1±1.59

/

1067

165.1~177.8

6 1/2~7

7.9±1.59

/

1168

181.0~200.0

7 1/8~7 7/8

8.7±1.59

5.6±0.79

1626

203.2~225.4

8~8 7/8

9.5±1.59

6.4±0.79

1727

228.6~250.8

9~9 7/8

10.3±2.37

7.1±1.59

1829

254.0~276.2

10~10 7/8

11.1±2.37

7.9±1.59

1930

279.4

11

11.9±2.37

8.7±1.59

2032


Drill collar Mechanical Performance

OD

Yield Strength

Tensile Strength σb

Elongation

Reduction of are

Impact

Size

σ0.2

Mpa(psi)

δ4%

%

Ft.1b


Mpa(psi)





3 1/8~6 3/4

≥758

≥827

≥18

50

≥50

-110,000

-120,000

7~10

≥689

≥758

≥20

-100,000

-110,000



Sreel Mark

Drill collar Chemical Composition %

C

Si

Mn

P

S

Cr

Mo

Cu

Al

4145H

0.42~0.48

0.15~0.35

0.90~1.20

≤0.03

≤0.03

0.90~1.20

0.15~0.25

≤0.2

0.025~0.045

Other Elements:N≤0.015,Ni≤0.5

Process

1. Forging: Like spiral and non-magnetic drill collars, it is forged from high-strength alloy steel billets using high-pressure presses or hammers. The forging process creates a strong, homogeneous material with improved mechanical properties.
2. Heat treatment: After forging, collars undergo heat treatment to enhance their strength and toughness. This typically involves quenching and tempering the steel to achieve the desired mechanical properties, such as high yield strength and impact toughness.
3. Machining: Standard collars are machined to their final dimensions using lathes and milling machines. This includes turning the outer diameter, boring the inner diameter, and cutting threads at both ends to connect to other drill string components. It may also undergo additional machining operations, such as the creation of wear pads or tool joint boxes and pin connections.
4. Surface treatments: To improve wear resistance and corrosion protection, standard collars may undergo surface treatments similar to those used on spiral collars. This may include hardfacing of high wear areas using welding process or the application of protective coatings such as thermally sprayed carbide or chrome plating.
5. Inspection and quality control: it undergoes thorough inspection and quality control processes to ensure that it meets the required specifications. This includes dimensional checks, non-destructive testing (NDT) methods such as ultrasonic testing or magnetic particle inspection, and mechanical property testing to verify the strength and toughness of the steel.

Packing

  • Iron frame packing

    Iron frame packing

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