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round drill collar

round drill collar

There are different kinds of drill collars,including round drill collar,spiral drill collar,non-magnetic drill collar,square drill collar and so on.Ordinary drill collar is the circular cross section, the center has a water hole,the wall thickness is larger,the nozzle is smaller, the weight of per unit length is greater than the size of drill pipe almost 4- 5 times .The majority of drill collar is thread processing directly on the pipe body , but some of them also use the replaced joint.

(1)Eccentric-weight drill collar is an effective anti-deviation drilling tool,with high drill pressure used in oblique areas,rectifying oblique as well.

(2)When drilling directional wells eccentric-weight drill collar is an effective tool to reduce oblique or straighten the well hole using high drilling pressure.

(3)Eccentric-weight drill collar has the advantages of simple structure,convenient use,connected directly to common drill collar without centralizers,greatly convenient for sinking in,fishing and milling operations.

(4)Eccentric-weight drill collar runs downhole safely,danger of leakage or bit freezing hard to appear.

(5)Pay much attention to avoid mud balling and prevent effect of anti-deviation .

CHEMICAL COMPOSITION

Drill Collar Specification

Thread Type

Length

Diameter of shoulder guide Angle

Reference bending strength ratio

mm

inch

mm

inch

mm

inch

NC23-31

31/8

11/4

9150

30ft

NC26-35(23/8IF)

31/2

11/2

NC31-41(27/8IF)

41/8

2

NC35-47

43/4

2

NC38-50(31/2IF)

127

5

21/4

121

NC44-60

6

21/4

9150or9450

30ftor31ft

NC44-60

6

213/16

NC44-62

61/4

21/4

NC46-62(4IF)

61/4

213/16

150

NC46-65(4IF)

61/2

21/4

NC46-65(4IF)

61/2

213/16

NC46-67(4IF)

63/4

21/4

NC50-67(41/2IF)

63/4

213/16

NC50-70(41/2IF)

7

21/4

NC50-70(41/2IF)

7

213/16

NC50-72(41/2IF)

71/4

213/16

NC56-77

73/4

213/16

NC56-80

8

213/16

65/8REG

81/4

213/16

NC61-90

9

213/16

75/8REG

91/2

3

NC70-97

93/4

3

NC70-100

254

10

3

85/8REG

11

3

Note: 1.Drill collar thread type: NC-Digital IF-Internal flat type REG-Normal type

In addition, our company can produce the drill collar and spiral drill collar, which can also produce the special specifications of the drill collar and the high efficiency and wear-resisting lengthening drill collar

cutting depth

Lead ±25.4

mm

in

A(mm)

B(mm)

mm

86

679

914

4~4 1/8

914

4 1/2~5 1/8

965

5 1/4~5 3/4

1067

5 7/8~6 3/8

1067

6 1/2~7

1168

7 1/8~7 7/8

1626

8~8 7/8

1727

9~9 7/8

1829

10~10 7/8

1930

11

2032

Advantages of Drill Collar Production Process:

In the process of heat treatment, the drill collar has added a special normalizing process, which makes the thread part grain more refined, enhances the drill collar thread strength, and effectively improves the service life of the drill collar.

Sreel Mark

Chemical Composition %

C

Si

Mn

P

S

Cr

Mo

Cu

Al

4145H

≤0.03

≤0.03

≤0.2

Other Elements:N≤0.015,Ni≤0.5

Drill Collar Mechanical Performance

Drill Collar Outside Diameter Range

Yield Strength

Tensile Strength

ElongationA%

HB

Charpy ImpactAkv J

mm

in

MPa

Psi

MPa

Psi

3-1/8~6-3/4

≥758

≥110000

≥965

≥140000

≥13

285~341

≥54

7~11

≥689

≥100000

≥930

≥135000

≥13

285~341

≥54

Under special conditions, the impact work of the charpy can be determined as greater than 70J according to the supply and demand

Size

Code

Thread

Length(mm)

Weight(kg)

3-1/8

NC23-31

NC23

9140

298

3-1/2

NC26-35

NC26

9140

364

4-1/8

NC31-41

NC31

9140/9450

474/490

4-3/4

NC35-47

NC35

9140/9450

674/697

5

NC38-50

NC38

9140/9450

725/749

6

NC44-60

NC44

9140/9450

1125/1163

NC44-60

9140/9450

1022/1056

6-1/4

NC44-62

NC44

9140/9450

1237/1279

NC46-62

9140/9450

1134/1172

6-1/2

NC46-65

NC46

9140/9450

1352/1398

NC46-65

NC50

9140/9450

1249/1291

6-3/4

NC46-67

NC46

9140/9450

1471/1521

7

NC50-70

NC50

9140/9450

1597/1651

NC50-70

9140/9450

1494/1545

7-1/4

NC50-72

NC50

9140/9450

1625/1680

7-3/4

NC56-77

NC56

9140/9450

1895/1960

8

NC56-80

NC56/6-5/8REG

9140/9450

2040/2109

8-1/4

6-5/8REG

6-5/8REG

9140/9450

2188/2263

9

NC61-90

NC61

9140/9450

2658/2748

9-1/2

7-5/8REG

7-5/8REG

9140/9450

2954/3054

9-3/4

NC70-97

NC70

9140/9450

3127/3234

10

NC70-100

NC70

9140/9450

3308/3421

11

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度≥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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