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Heavy Weight Drill Pipe

Heavy Weight Drill Pipe

Heavy weight drill pipeis a medium-weight drill tool similar to drill pipe,whose wall is thicker than that of drill pipe and thinner than that of drill collar. Its tube is connected with special length-added drill pipe joint(integral heavy weight drill pipe is made up of tube and tool joint). Among assemblies,it is generally added between drill pipe and drill collar to prevent sudden changes in cross-section of drill string,and reduce its fatigue. Using it to replace part of the drill collar can reduce torque, improve load,and increase drilling ability during deep well drilling;meanwhile pick-up sub and safety clamp will not be used drilling operation ,which is easy to operate and can save tripping time.It can drill in in high speed under low torque in directional wells and reduces the abrasion and fracture of string without differential pressure and sticking because of the lower steel grade than drill collar, small touching area with the well wall.

square Kelly China:Found Petroleum Equipment

If you are finding high quality and cheap API 7-1 Heavy Weight Drill Pip, you can choose us! We adhere to the principle of good faith cooperation and look forward to working with you as a partner!

CHEMICAL COMPOSITION

Integral heavy weight drill pipe

Size

Outer diameter

Inside diameter

Joint outer diameter

Joint inside diameter

Connecting thread

Slip max. diameter

Upset middle diameter

3 1/2

3 1/2

2 1/4

4 3/4

2 1/4

NC38

3 7/8

4

2

2 1/16

(4 7/8, 5)

2 1/16

1 13/16

4

4

2 1/2

5 1/4

2 1/2

NC40

4 3/16

4 1/2

2 1/4

2 9/16

2 9/16

2 5/16

4 1/2

4 1/2

2 11/16

6 1/4

2 11/16

NC46

4 11/16

5

2 7/16

2 3/4

2 3/4

2 1/2

2 13/16

2 13/16

2 9/16

5

5

3

6 5/8

3

NC50

5 1/8

5 1/2

2 3/4

5 1/2

5 1/2

3 1/4

7

3 1/4

5 1/2 FH

5 11/16

6

3

3 3/8

(7 1/4, 7 1/2)

3 3/8

3 1/8

3 7/8

3 7/8

3 5/8

4

4

3 3/4

6 5/8

6 5/8

4

8

4

6 5/8 FH

6 15/16

7 1/8

3 3/4

4 1/2

(8 1/4, 8 1/2)

4 1/2

4 1/4

5

5

4 3/4

Spiral heavy weight drill pipe

Specification mm

Tube

Joint

ID mm

Elevator upsetmm

elevator groove/Slip outside diameter mm

Screw in diametermm

Spiral groove depthmm

Thread Type

OD mm

ID mm

54

NC38

54

127

NC46

127

NC50

Steel 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

Yield strength

Tensile Strength

ElongationA%

HB

Charpy impactAkv J

MPa

Psi

MPa

Psi

≥758

≥110000

≥965

≥140000

≥13

285~341

≥54

Product superiority:

In the process of heat treatment, a normalizing process is added, which makes the threads more granular, increases the thread strength, and effectively improves the service life of the product.

Weld heavy weight drill pipe:

Using the current domestic and foreign advanced heat treatment technology of friction welding deformation ,and heat affected zone smaller, welding process more simple and strict welding deformation and heat treatment standard procedure qualification, tuning parameters to ensure better welding quality more stable and reliable.

Welded heavy weight drill pipe

Type

Outer diameter

Inside diamter mm

Joint type

mm

in

MJZ29-NC31-I/II

2 7/8

NC31

MJZ35-NC38-I/II

NC38(3½ IF)

MJZ40-NC40-I/II

4

NC40(4FH)

MJZ45-NC46-I/II

NC46(4IF)

MJZ50-NC50-I/II

127

5

NC50(4½ IF)

MJZ55-5½ FH-I/II

5½ FH

MJZ66-65/8FH-I/II

Aug-65

65/8FH

127



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