HWDP Technical Support

Integral or Weld Heavy Weight Drill Pipe

Standard: API Spec 7
Specification: OD 3 1/2”, 4 1/2”, 5”, 5 1/2”
Material: AISI 4145H Alloy Steel and Non-magnetic material
Type: Integral and Friction welded

Usage: HWDP is the transition zone between drill collar and drill pipe. It can not only reduce stress-formation in the connection of drill collar and drill pipe, but also reduce the wear on OD.

Description:

Heavy Weight Drill Pipe is made from one piece of AISI 4145H solid bar, fully heat treated, all physical properties conform to API Spec 7 latest edition. It can easily solve problems arising in vertical holes in soft formation by replacing part of the drill collars. The advantages include:

  1. Reduced torque in high-rpm, deep drilling.
  2. Less trip time as compared to handling a long string of drill collars.
  3. Fewer tool-joint connection failures.
  4. Easy in handling and transporting to and from locations
  5. Helpful for keep direction of directional well.

HWDP's wear resistance hardbanding is standard on tool joints connections and central upset. Hardbanding is made by an automatic machine after preheating the pipe and is followed by stress relieving.

Standard Bands:

  1. One 4" wear band on both pin and box end, plus one 1" band on 18shoulder of box.
  2. Two 3" wear bands on central upsets.
  3. The hardbanding is completely flush on both tool joints and 1/8" oversize on the central upset (fully flush on request).
  4. The types of Hardbanding include Iron-Matrix powder alloy, Tungsten Carbide particle, and Arnco 100XT.
  5. Our HWDP could be coated internally with DPC (equivalent to TK 34) as customer's request that are able to prevent corrosion and extend using time.

HEAVY WEIGHT DRILL PIPE Specification

Size

Outside Diameter

Inside Diameter

Connection

Body

Single Weight

C

E

Type

Outside Diameter A

Bevel edge of pin and box shoulder DFmm

Upset Section Size

　

　

Central Section

End Section

mm

in

mm

in

Dmm

Bmm

I Type (Length 9300mm)

ZH-JZ55-51/2FH-I

139.7

5 1/2

5 1/2FH

92.1

3 5/8

170.7

152.4

144.5

730

ZH-JZ50-NC50-I

127

5

NC50     (4 1/2IF)

76.2

3

154

139.7

130.2

700

ZH-JZ45-NC46-I

114.3

4 1/2

NC46 (4IF)

71.4

2 13/16

145.3

127

117.5

585

ZH-JZ35-NC38-I

88.9

3 1/2

NC38

52.39

2  1/16

116.3

101.6

92.1

370

II Type (Length 13500mm)

ZH-JZ50-NC50-II

　

　

NC50         (4 1/2IF)

165.1

6 1/2

154

139.7

130.2

945

ZH-JZ45-NC46-II

　

　

NC46 (4IF)

158.8

6 1/4

145.3

127

117.5

790

 

Mechanical Properties of HWDP

Yield Strength (MPa)σ0.2

Tensile Strength (MPa)σb

Elongationδ(%)

Hardness Brinell BHN

Impact AKV(J)

≥758

≥964

≥13

285～341

≥54