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HWDP weight drill pipe
HWDP weight drill pipe

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Quality/Safety Certification: 0.00


The HWDP's uses AISI 4145H alloy structural steel, the technique of production exactly carries on the SY/T5146-1997 standard

 The HWDP's uses AISI 4145H alloy structural steel, the technique of production exactly carries on the SY/T5146-1997 standard, HWDP is one kind of medium weight and the drill pipe similar drilling tool, its wall thickness is thicker than the drill pipe, is thinner than the drill collar, on its thick wall body connected special and lengthen drilling joint. Generally adds between the drill pipe and the drill collar, prevents to drilling string's sudden change, reduces drill pipe's weariness; Uses in the directional well, might in compare the low torque in the situation to sneak in high speed, reduces drilling string 's attrition and the breakage. Because its rigidity are less than the drill collar, less contact area with wall of a well , is also not easy to form differential pressure sticking.

Dimensions of heavy weight drill pipe 
Specifi-
cations
 outside
diameter C
 inside diametertool jointtubesingle
 qual
ity
mmin  form outside
diameter 
Chamfering
 the
shoulder
 internal
and
external
 thread
some
 guy
 size
mmincentralEnd
I type (single length of 9300mm)
ZH-JZ55-51/2FH-I139.792.15 1/2FH177.87170.7152.4144.5730
ZH-JZ50-NC50-I127.0 76.2NC50(4 1/2IF)168.36 5/8154.0 139.7130.2700
ZH-JZ45-NC46-I114.371.4NC46(4IF)158.86 1/4145.3127117.5585
ZH-JZ35-NC38-I88.952.4NC38120.74 3/4116.3101.692.1370
ZH-JZ29-NC31-I73.0350.8NC31104.84 1/8100.484.181.0 220
II type (single length of 13500mm)
ZH-JZ50-NC50-II127.0 76.2NC50(4 1/2IF)165.16 1/2154.0 139.7130.2945
ZH-JZ45-NC46-II114.371.4NC46(4IF)158.86 1/4145.3127.0 117.5790
Note: An overall increase drill pipe and drill collar section
modulus section modulus ratio should not exceed 5.5

Mechanical Properties
yield
 strength
 σ0.2
tensile
σb
rlongat
ion
δ4(%) 
brinell
 HB
Charpy impact energyALV(J)
≥758≥964≥13285∼341≥54

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