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 Hilong Large Size HDD (Horizontal Directional Drilling) Drill Pipe

Product Introduction 

With the increase of drilling difficulty, the requirement of drill pipe is increasing at the same time. The whipping phenomenon and fracture failure of normal drill pipe in long distance horizontal directional drilling engineering is caused by the insufficient rigidity and buckling strength of the drill pipe. Galling caused by the difficulty of tool joint alignment is a common phenomenon in horizontal directional drilling engineering. 
Hilong designed and manufactured the HDD (horizontal directional drilling) drill pipe meet the large size need, at the same time the rigidity and the thrust also have improved. Special thread design and a guide section adding in the pin thread to prevent the possibility of galling and improve the fatigue capacity, meet the requirement of pipe line horizontal directional drilling engineering.

Product Advantage

·Large size, thick wall pipe body and high steel grade to improve the rigidity and the buckling strength;
·Special connection design using special large thread root radius and add a guide section to improve the fatigue capacity and prevent the possibility of galling;
·Special external upset technics effectively reduce stress concentration on the upset vanishing area, reduce fatigue failure possibility and improve anti-fatigue performance;
·Adding several joints of thick-walled drill pipe behind the over-sizing bit is a good choice to improve the rigidity of drill pipe, decline of drill pipe whipping and reduce fracture failure possibility.

Product Specification

(a)Size Range: Normally 5 7/8", 6 5/8", 7 5/8", 8 5/8", 10", 10 3/4", 12 3/4"and 13 3/8"；
(b)Product Grade: G105, S135, HLDT-SH®Z140, HLDT-SH®V150, HLDT-SH®U165.

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