EN
NRQ Both-End Quenched & Tempered Wireline Coring Rod
NRQ is reinforced NQ-standard wireline core drill rod, compliant with international DCDMA standards. With pipe body size Φ70.1×5mm, it adopts ZT950 high-grade alloy steel substrate and precise medium-frequency sectional quenching & tempering on both ends. It is specially developed for deep mineral exploration and deep geological coring, with maximum recommended drilling depth of 1900 meters.
Certificates: ISO, RoHS, MSDS
Material: ZT950
Available Lengths: 1m, 1.5m, 3m
Recommended Drilling Depth: 1900m
Description
NRQ is reinforced NQ-standard wireline core drill rod, compliant with international DCDMA standards. With pipe body size Φ70.1×5mm, it adopts ZT950 high-grade alloy steel substrate and precise medium-frequency sectional quenching & tempering on both ends. It is specially developed for deep mineral exploration and deep geological coring, with maximum recommended drilling depth of 1900 meters.
Different from ordinary NQ and RNQ drill rods, NRQ has comprehensive upgrades in wall thickness, raw material, heat treatment and thread reinforcement. It balances ultra-high tensile & torsional strength and high body toughness, suitable for 1600-1900m straight deep holes, high-inclination holes, fractured hard rock and complex structural formations. It solves common defects including thread fracture, tooth collapse and pipe bending fatigue fracture, fully compatible with all NQ wireline coring accessories.
| Model: | NRQ Reinforced Wireline Core Drill Rod With Both Ends Tempered |
| Dimension: | OD 70.1mm, Wall Thickness 5mm, ID 60.1mm |
| Material: | ZT950 High-strength Drilling Alloy Steel |
| Thread Standard: | NQ standard 1:22 taper thread, 3TPI right-hand taper thread |
| Standard Length: | 1m, 1.5m, 3m, Customized Length Available |
| Heat Treatment: | Extended medium-frequency induction tempering on both ends, normalized high-toughness pipe body |
| Max Recommended Drilling Depth: | 1900m |
| Compatible Tools: | Full set NQ wireline coring tools, mixed use with original NQ drill rods available |
Specifications
| Technical Specifications | |
| Model | NRQ |
| Design depth (m) | 1900 |
| Drill pipe thread tensile strength (KN) | 302 |
| Drill pipe thread torsional strength (N.m) | 5504 |
| Rod body size (mm) | 70.1*5 |
| Connection method | Self-joint |
| Rod material | ZT950 |
| Material tensile strength (MPa) | 1050 |
| Material yield strength (Mpa) | 950 |
| Material elongation after fracture | ≥13% |
| TOP SELLING MODELS | |
| Wireline Series | BQ, NQ, HQ,PQ,PHD,HRQ,NRQ,HXQ,NXQ |
| CH Series | CNH.CHH.CPH |
| S Series | SC56.S59,S73,S95,S110,S130 |
| TWSeries | BTW, NTW, HTW,HTWA,HWTH,NTWA,NTWH |
| Upset Series | PHD-IUW, HRQ-IUW, NRQ-IUW, NQA-IUW |
| DTH Series | PA, HA, NA |
| Horizontal Series | NQUA, HQUA |
Product features
1. Extended both-end tempering, suitable for 1900m ultra-long drill string
Conventional NQ/RNQ drill rods are only suitable for drilling depth within 1300m. NRQ adopts extended tempered zone and reinforced thread structure, bearing dead weight and super-large rotary torque of 1900m drill string, greatly improving thread fatigue life and avoiding sudden rod breakage in deep hole drilling.
2. 70.1*5mm optimized structure, balance strength and water passing efficiency
5mm optimized thickened wall improves overall load-bearing capacity. Large inner bore ensures sufficient flushing fluid flow, fast cuttings discharge and efficient diamond bit cooling, improving deep hole drilling efficiency.
3. Rigidity-toughness balanced design, adapt to complex deep formations
Hardened rod ends and tough pipe body resist strong cutting torque of deep hard rock, and buffer bending impact of inclined holes and fractured zones. No pipe bending or fatigue fracture during 1900m deep hole construction.
4. Universal NQ thread, zero accessory replacement cost
Fully interchangeable with all mainstream NQ wireline coring tools on the market. Original core barrel, overshot, diamond bit and reaming shell can be matched directly. New NRQ and old NQ rods can be used mixedly to save project cost.
5. Anti-corrosion & anti-galling, stable downhole performance
Adopt composite nitriding thread treatment, anti-rust and anti-seize in mineralized groundwater and acidic mud. Easy breakout after long-term shutdown, reduce downhole stuck risk and construction loss.
