PRODUCTS

BTW/ NTW/ HTW Thin Wall Series Core Barrel

The TW series rope core drilling tools are internationally standard thin-walled rope core drilling tools, available in three specifications: BTW/NTW/HTW. They feature a thin-walled drill pipe combined with a small cutting surface drill bit design. They do not require lifting the drill pipe or the inner pipe for fishing and core extraction. Compared to the standard Q series, they are 20%–30% more efficient, lighter in weight, and have less torque. They are suitable for portable drilling rigs and **deep and medium-depth (≤2000m)** exploration. They are the preferred equipment for efficient drilling in shallow and deep wells and green exploration.

Single rod length: 1.5m / 3m (standard)
Drill pipe material: 42MnMoB/ZT850, yield strength ≥ 950MPa
Joint material: 30CrMnSiA, CNC precision thread
Applicable depth: 0–3000m (deep hole reinforced type)

Description

The TW series is an internationally used thin-wall wireline core drilling tool, available in BTW, NTW and HTW specifications. Featuring thin-wall drill rods and bits with small cutting area, it enables core retrieval by wireline without pulling out the drill string. Compared with standard Q-series tools, it delivers 20% to 30% higher drilling efficiency, lighter weight and lower torque. Ideal for portable drilling rigs and medium-deep holes within 2000 meters, this lightweight and high-efficiency product is easy to transport, and serves as the optimal choice for high-speed drilling and eco-friendly exploration in coal measures, metal mineral prospecting and engineering investigation.

Core drilling tool: It is a double-tube assembly, without drill bit or reamer.

Core drilling tool (head): Does not include inner and outer tubes, locking guard, locking chamber, locking spring, locking spring seat, centering ring, and seat ring.

Single rod length: 1.5m / 3m (standard)

Drill pipe material: 42MnMoB/ZT850, yield strength ≥ 950MPa

Joint material: 30CrMnSiA, CNC precision thread

Applicable depth: 0–3000m (deep hole reinforced type)

Structural features

(thin-walled lightweight & efficient drilling):

1. Thin-walled drill pipe: High-strength alloy (42MnMoB/ZT850), wall thickness reduced by 30%, lightweight, low torque, easy to relocate, suitable for portable drilling rigs.

2. Small cutting surface drill bit: Thin body, small annular cutting area, drilling speed increased by 20%–30%, faster progress.

3. Large annular gap: Larger gap between the hole wall and the drill pipe, prevents shrinkage, easy to discharge powder, smooth logging, suitable for coal-bearing / soft formations.

4. Standard double-tube assembly: Single-action inner pipe + vibration reduction + position reporting, core extraction does not rotate, core extraction rate ≥ 90%, compatible with Q series fishing tools.

5. High-precision threads: Sealing pressure resistance ≥ 20MPa, strong torsion resistance, easy control of deep hole hole deviation and good stability.

Specifications

Model	Drill Bit		Reaming O.D	outer tube		inner tube		Drill Rod
Model	O.D	I.D	Reaming O.D	O.D	I.D	O.D	I.D	Drill Rod
BTW	59	42	59.5	57	48.5	46.5	43	BTW
NTW	75	56	75.5	74	65.1	61.4	57.2	NTW
HTW	95.5	71	95.9	93	82	78.4	73	HTW

Core advantages

(compared to standard Q series):

1. Efficient speed increase: Small cutting area, drilling speed is 30% faster, significant improvement in shift production rate.

2. Lightweight and portable: Drill pipe is 30% lighter, compatible with portable drilling rigs, quick relocation, low cost, green exploration.

3. Stable deep holes: Thin-walled high strength + large gap, prevents stuck drill, prevents diameter reduction, small hole deviation, excellent performance in 2000m deep holes.

4. Universal interchangeability: DCDMA standard, inner pipe / fishing tool compatible with Q series, universal spare parts, low cost.

5. Reliable core sampling: Single-action vibration reduction design, core sampling rate ≥ 90% for medium-hard to soft rocks, complete core.