EN
CGE WUXI HWT Geological Drilling Casing Pipe
HTW Wireline Casing is a heavy-duty, flush-joint, dual-purpose casing & drill rod designed for HQ wireline coring, deep borehole drilling, and unstable formation support in mineral exploration, geotechnical drilling, water well, and construction drilling.
Certificates: RoHS, MSDS, ISO (available upon purchase)
Material: 4130 steel
Custom lengths: 0.6m, 1.5m, 3m
MOQ: 1 piece
Description
HTW casing is a DCDMA standard W-series dual-purpose pipe that functions as both casing and drill rod, specially designed for HQ wireline coring. Featuring high strength and excellent compatibility, it is ideal for borehole wall protection in deep holes, fractured zones, loose formations and aquifers. Widely used in mineral exploration, geotechnical investigation, water well drilling and underground foundation engineering, it delivers great working efficiency and cost-effectiveness, making it a top choice for medium and deep geological drilling.
Specifications
| No. | Name | OD*thickness (mm) | thread pitch | length of thread (mm) | weight (kg/m) |
| 1 | AW | 57.1*4.35 | 4 | 57.2 | 5.66 |
| 2 | BW | 73.0*6.35 | 4 | 63.5 | 10.44 |
| 3 | NW | 88.9*6.35 | 4 | 69.9 | 12.93 |
| 4 | HW | 114.3*6.35 | 4 | 76.2 | 16.91 |
| 5 | HWT | 114.3*6.35 | 2.5 | 62.74 | 16.91 |
| 6 | PW | 139.7*6.35 | 3 | 82.6 | 20.88 |
| 7 | PWT | 139.7*7.1 | 2.5 | 62.74 | 23.22 |
| 8 | SW | 168.3*7.95 | 3 | 88.9 | 31.44 |
Product Features
1.Dual-purpose design: works as both casing and drill rod（cost-saving）
2.Flush joint / coupling-free: uniform OD, lower running resistance, no stuck pipe
3.High-strength alloy steel (4130), fully quenched & tempered – high collapse resistance, high torque capacity
4.HTW tapered buttress thread: faster make/break, anti-galling, anti-seize, repeated use
5.High concentricity & straightness: minimizes borehole deviation
6.Compatible with HQ wireline coring system: smooth inner tube passage
7.Multi-length available: 0.6m / 1.5m / 3m / custom；supports permanent borehole retention
Application Scenarios
Mineral exploration, geotechnical drilling, water well drilling, underground engineering, deep hole coring, unstable formations (fractured, loose, aquifer).
FAQ
Q1: What is the biggest problem with standard casing in deep & complex formations?
A: Standard casing often suffers from borehole collapse, slurry loss, pipe deformation under high formation pressure in deep, fractured, or loose ground.
HTW solution: heavy-wall high-rigidity body + high collapse resistance stabilizes unstable formations; seals water loss zones effectively.
Q2: Why do many crews get stuck pipe & high running resistance with conventional coupled casing?
A: Traditional coupled casing has larger joint OD, easily scrapes borehole wall, gets stuck, especially in deviated holes.
HTW solution: flush joint / coupling-free design, uniform OD; reduces running/pulling resistance by 30–50%；eliminates coupling sticking.
Q3: Thread galling, seizing, slipping – why does this happen often?
A: Standard threads are thin, low strength; under high torque & repeated make/break, they gall, seize, slip, or break.
HTW solution: HTW tapered buttress thread (2.5 TPI), wider spacing, high hardness surface treatment；anti-galling, anti-seize, high torque capacity；withstands heavy loads.
Q4: Drilling in hard rock / deep holes – short service life & frequent replacement?
A: Ordinary casing uses low-grade steel, poor toughness; easily bends, cracks, fatigues in hard rock & deep holes.
HTW solution: 4130 alloy steel, full-body quenched & tempered；high strength & toughness；impact resistant, fatigue resistant；longer service life；lower replacement cost.
Q5: Borehole deviation & wireline tool jamming – how to fix?
A: Low precision casing (poor concentricity/straightness) causes deviation; irregular ID makes HQ inner tube jam.
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