R&T Group
Heavy Weight Drill Pipe

Kelly
Kelly
Drill Pipe
Drill Pipe
Drill Bit
Drill Bit

Heavy Weight Drill Pipe

Specification of Heavy Weight Drill Pipe

  • Material:  AISI 4145H Alloy steel, Non magnetic steel, etc.
  • Use: Heavy weight drill pipe is mainly used between dill collar and dill pipe to ease transition stress concentration and reduce the rate between contact area and outer wall wear, which can effectively prevent the pressure sticking.
  • Standard:  API Spec 7-1 or SY/T 5146 Standard.

Size (inch)

Upper Box Connection

Lower Pin Connection

Driving Section (mm)

Type(LH)

OD(mm)

CrossFlat

For

Square

Kelly

Cross

Corner

Std

Optional

Std

Optional

Thread

OD(mm)

ID(mm)

2 1/2''

6 5/8REG

4 1/2REG

196.8

146

NC26

85.7

31.8

63.5

83.3


3

6 5/8REG

4 1/2REG

196.8

146

NC31

104.8

44.4

76.2

100

85.7

3 1/2''

6 5/8REG

4 1/2REG

196.8

146

NC38

120.6

57.2

88.9

115.1

100.8

4 1/4''

6 5/8REG

4 1/2REG

196.8

146

NC46

158.8

71.4

108

141.3

122.2

6 5/8REG

4 1/2REG

196.8

146

NC50

161.9

71.4

108

141.3

122.2

5 1/4''

6 5/8REG

---

196.8

---

5 1/2FH

177.8

82.6

133.3

175.4

151.6

6 5/8REG

---

196.8

---

NC56

177.8

82.6

133.3

175.4

151.6

6”

6 5/8REG

---

196.8

---

---

---

---

152.4

---

173

6 5/8REG

---

196.8

---

---

---

---

152.4

---

173

The Features of Heavy Weight Drill Pipe

Heavy weight drill pipe is a medium-weight drill tool similar to drill pipe, whose wall is thicker than that of drill pipe and thinner than that of drill pipe and thinner than that of drill collar. Its tube is connected with specially lengthened drill pipe joint (Integral heavy weight drill pipe is an integral product made up of tube and tool joint) among drilling 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 during tripping operation, which is easy to operate and can save tripping time. The performance of heavy weight drill pipe meets requirements of API Spec 7 – 1.
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