Core Casing WT

The WT series core casing is a type of casing used in wireline core drilling to provide borehole stability and facilitate the retrieval of core samples. It is designed to support drilling operations by preventing borehole collapse, reducing contamination, and ensuring smooth core extraction. The WT series casings are commonly used in mineral exploration, geotechnical investigations, and environmental drilling.

Every WT casing tube manufactured by G-Drills strictly complies with international DCDMA and ISO 3551-1 standards, ensuring perfect concentric nesting and fluid clearance for deep-hole drilling:

Seamless Tool Integration: Designed for flawless nested clearance. Our NWT, HWT, and PWT casings integrate perfectly with standard NQ, HQ, and PQ wireline drill rods and core barrels.

100% Field Interchangeability: Fully compatible with global wireline drilling systems, allowing trouble-free replacement on-site without thread-matching or tolerance issues.

The threaded joint is the most critical load-bearing point. We optimize the thread life and joint strength through state-of-the-art manufacturing:

WT Tapered Joint Design: Featuring a coarse 2.5 threads per inch (TPI) tapered thread. This allows for extremely fast make-up and easy break-out, cutting rod-handling time in half compared to parallel threads.

High-Frequency Induction Hardening: The pin and box joint ends undergo targeted induction heat treatment, achieving a surface hardness of HRC 55–60.

Anti-Galling Protection: While keeping the tube body highly ductile, the hardened thread surface drastically reduces wear, eliminates thread stripping, and prevents "galling" during high-frequency reuse.

To withstand extreme torsional stress and high-pullback forces during casing retrieval, G-Drills relies exclusively on premium-grade structural alloy steel:

Material Composition: 100% premium 42CrMo (ASTM 4140) cold-drawn seamless steel tubing, offering unparalleled mechanical properties compared to standard carbon steel.

Tensile Strength: $\ge 950 \text{ N/mm}^2$ – Built to endure heavy pulling loads in collapsed or shifting formations without parting.

Yield Strength: $\ge 850 \text{ N/mm}^2$ – High elastic limit prevents permanent casing warping or swelling under extreme hydrostatic pressure.

High-Precision Geometry: Straightness is strictly controlled within 0.8mm per meter, minimizing pipe-rotation vibration and inner wall friction.

WT Series Casing

Mineral Exploration. WT series core casing is widely used in mineral exploration to ensure borehole stability when drilling through various geological formations. It helps maintain the integrity of the borehole, allowing for accurate core sample retrieval without contamination, which is essential for assessing mineral deposits.

Geotechnical Drilling. In geotechnical investigations, WT core casing provides support in unstable ground conditions, preventing borehole collapse. It is commonly used in projects like foundation analysis, soil testing, and geological surveys to gather precise data for construction and infrastructure development.

Water Well Drilling. For water well drilling, WT series casings help secure the borehole, ensuring that the well structure remains intact. This is particularly important in loose or sandy formations where borehole walls may cave in without proper casing support.

Environmental Drilling. In environmental studies, core casing is used for groundwater monitoring and contamination assessment. It helps prevent external pollutants from entering the borehole, ensuring reliable data collection for environmental protection and remediation projects.

Oil and Gas Exploration. Although primarily used in mineral and geotechnical drilling, WT series core casing can also be applied in shallow oil and gas exploration to stabilize the borehole in preliminary drilling stages before deeper operations commence.

One-Stop Drill String Supply: We manufacture compatible Diamond Casing Shoes, Casing Advancers, and Wireline Drill Rods to guarantee perfect fitment and eliminate clearance errors.

Custom Manufacturing: Need heavy-wall configurations, alternative steel grades (such as 30CrMnSiA), or specific custom lengths? We provide tailored manufacturing to match your project demands.

Export-Ready Packaging: Secured in heavy-duty bundles or seaworthy wooden boxes with thread protectors on both ends to ensure rust-free, undamaged delivery to your job site.

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