Integral Heavy Weight Drill Pipe

Heavy Weight Drill Pipe

Model No:API certificate
Height:5 – 7 Meters

Integral heavy weight drill pipe is made from AISI 4145H alloy API Spec.7 and SY/T5144. It is formed by hot forged and fully heat-treated.There is wear resistance hard banding on tool joints connections and central upset.The types of hard banding include Arno 100XT and 300XT. All threads are phosphated, copperized or cold worked. All connections are equipped with pressed steel thread protectors. All threads are machined with CNC Lathes-Double-Shouldered and special threads.

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 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.

SpecificationOD CID EConnectionBodyWeight kg
StyleOD AInner and outer
thread DFmm
Center area DmmEnd area Bmm
ZH-JZ55- 51/2FH-I139.751/251/2FH92.135/8170.7152.4144.5730
ZH-JZ50- NC50-I127.05NC50 (41/2IF)76.23154.0139.7130.2700
ZH-JZ45- NC46-I114.341/2NC46 (4IF)71.42 13/16145.3127.0117.5585
ZH-JZ35- NC38-I88.931/2NC3852.3921/16116.3101.692.1370
ZH-JZ50- NC50-IINC50 (41/2IF)165.161/2154.0139.7130.2945
ZH-JZ45- NC46-IINC46 (4IF)158.861/4145.3127.0

◆Mechanical Properties of Integral Heavy Weight Drill Pipe

Min.Yield StrengthMin.Tensile StrengthMin.Elongation %Brinell hardness HBImpact value
(V-notch CHARPY)

◆ Integral Spiral Heavy Weight Drill Pipe Tolerances

ODIDLengthChamferInner and outer
thread connection A
±0.8±1.60±150±0.4±0.8±0.75%D+0.8 0
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