NTWH 1.5m/ 2m/ 3m Thin Wall Drill Rod Pipe

NTWH is an upgraded version of the NTW series thick-walled rope core drill pipe. It belongs to the mid-section specification of the TW thin-walled series of the DCDMA international standard. Its specification size is between the standard NTW and HTW. The outer diameter is 74.5mm and the wall thickness is 5.1mm. Through optimizing the structure by thickening the pipe body wall thickness and thickening and forging the joint structure, it combines the lightweight advantage of NTW products with the high-strength performance of HTW products. It can perfectly replace the conventional NQ thick-walled drill pipe. This drill pipe is specially designed for deep hole, inclined hole, and hard rock crushing geological exploration conditions. It is compatible with various large and medium-sized full-hydraulic exploration drilling rigs. Under the same outer diameter specification, its torsional strength is 32% higher than that of ordinary NTW drill pipes. The inner diameter size is better than that of NQ thick-walled drill pipes, and the mud flow efficiency is higher. The recommended drilling depth can reach 1300m. It is the main drilling equipment for medium and deep-hole mineral exploration. The product selects 4130/ZT950 chromium-molybdenum high-strength seamless alloy steel pipe as the base material. It adopts the thin-walled forming of the pipe body, the thickening and thickening of both ends, and the overall quenching and heat treatment. The surface layer of the male thread is treated with high-frequency quenching, with a hardness of HRC52~58. It has excellent anti-sticking, wear resistance and sealing performance. The thread size strictly follows the DCDMA international standard and can be universally interchangeable with the global mainstream NTW and NQ series drill tool assemblies. Its adaptability and practicability are extremely strong.

1.High strength and durability: With an outer diameter of 74.5mm and thickened joints, the deep hole torsion and bending loads exceed those of ordinary NTW by a large margin. The failure rate of broken rods during hard rock drilling is reduced by 60%.

2.Large inner diameter for smooth mud circulation: The inner hole diameter is larger than NQ. The debris is discharged quickly during rock fragmentation, and the drill bit is cooled adequately, preventing clogging, sticking, and burying of the drill bit.

3.Rope core retrieval efficient and labor-saving: Equipped with the standard NTW rope retrieval assembly, the core retrieval with steel wire rope does not require full-column drilling. The drilling time for raising and lowering the drill string is saved by more than 40%.

4.Universal and interchangeable: DCDMA standard threads, seamless matching of domestic/foreign NTW, NTWA, NQ drill bits, and inner pipe assemblies.

Q1: Regular NTW tends to thread fracture and pipe breakage in deep hard-rock drilling?
A: NTWH features thicker tube wall & reinforced upset joints with 32% higher torsion strength, effectively avoiding rod failure in deep deviated & mixed strata.

Q2: NQ heavy rod is overweight, leading to high rig load & high field transportation cost?
A: 7% lighter than solid NQ rod to reduce rig torque, fuel consumption and onsite handling expense.

Q3: Small ID of NQ causes poor mud flow and frequent stuck bit/pipe in broken formation?
A: Enlarged inner bore improves cuttings discharge & bit cooling to minimize stuck-drill downtime.

Q4: Concern on incompatibility with existing NTW/NQ core accessories?
A: DCDMA standard threads realize full interchangeability with original NTW & NQ bits and barrel assemblies.

Q5: HTW oversize OD cannot fit existing medium-small drill rigs?
A: Same 73.1mm OD as standard NTW, directly adaptable to all original NTW matched drilling rigs.