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Drill Collars

Product Name:Drill Collars ,Spiral Drill Collar,Non-magnetic Drill Collar,Drill Collar and Drill Stem Accessories; 

SizeOuter diameter:3 1/8"-11"                    

Length :30Ft   /   31Ft   /   43Ft/R1~R3

Connection type:NC , REG , FH, IF

Thread:NC26, NC31, NC38, NC40, NC46, NC50, 5.1/2FH

Material:Stainless Steel/Alloy steel/4145H/Carbon steel

Standard:API 5DP/API Spec 7-1

Application:Oil and gas well drilling/Oilfield Drilling

Description

API Oil Well Spiral Drill (Bottom) Collar for Drilling Price
1. Introduction

Drill collar is used in the drilling of oil wells for weighting drill bit, enabling it to drill through rock. It is a bar made of solid steel, either plain carbon steel or non-magnetic steel alloy, drilled lengthwise to permit the passage of drilling fluids. Drill collar is the lowest element of a drill string, which encompasses all the elements of a downhole process from surface to rock bit.
Drill collar is typically 31 feet (about 9.45 m) long and threaded at both ends, male at one end and female at the other, to allow multiple drill collars to be joined above bit assembly. The number of drill collars attached to a drill string will depend upon the material composition of the strata at drill site and the likely depth of well.
Typically, drill collars will be consistent in length but may vary in diameter, and their outside configuration may be slick or spiral. The outside diameter may vary from about 3 inches (7.62 cm) to 11 inches (27.9 cm) and greater.
2. Classification
1) Slick Drill Collar
Drill Collar is an integral heavy-wall joint manufactured from a solid bar of modified alloy steel. The solid bar is quenched and tempered to obtain required mechanical properties, then trepanned, drifted and threaded. Drill collar is furnished as slick or spiraled in 30 or 31 foot lengths.
Slick drill collar is supplied with the mill as-rolled surface finish. Spiraled drill collar has grooves machined in its outside surface. The spiral grooves promote even flow of drilling fluid around collar diameter, equalizing pressure and reducing the occurrence of differential sticking.
2) Spiral Drill Collar
Spiral drill collar is used to reduce contact area with hole so as to avoid efficiently bit sticking from differential pressure. Our spiral drill collars are manufactured strictly according to API standard.
a. Materials: AISI 4145H alloy steel, non magnetic steel, etc.
b. Shape: It is a kind of drill collar which adds three dextrogyrate spiral grooves on the outer circle of ordinary drill collar when processing, to reduce the area of contact and friction with well wall, which can effectively prevent pressure sticking.
c. Usage: It is mainly used between drill head and drill pipe, so that it can make drill head work reposefully and keep right trace by providing the pressure and weight for drill head.
d. Standard: API Spec 7-1 or SY/T5144 Standard.
e. Inspection & Test: In the process of production, traceability are maintained from the receipt of raw material to the completion of final products, and serial numbers are die stamped on each work piece body. Inspection and test are performed in every manufacturing process.
 
3) Non-magnetic Drill Collar
The materials of non-magnetic drill collars are made from chrome manganese low carbon austenitic alloy, which has the following characteristics:
The chemical composition should be controlled strictly in 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.

Specification

Chemical composition

Drill Collor 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

Typically Size of Spiral Grooving

OD(In.) Screw depth(In.) Screw Leadin
4~4 3/8 6/32±1/32 36±1
4 1/2~5 1/8 7/32±1/32 38±1
5 1/4~5 3/4 1/4±1/32 42±1
5 7/8~6 3/8 9/32±1/16 42±1
6 1/2~7 5/16±1/16 46±1
7 1/8~7 7/8 11/32±1/16 64±1
8~8 7/8 3/8±1/16 68±1
9~9 7/8 13/32±3/32 72±1
 
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

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

 

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

127.0

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

254.0

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



Production Process

Packaing

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