Geoprobe® 3.5 GPS Sonic Casing: One Piece. No Welds. Forged to Last.

Geoprobe^® 3.5 GPS sonic casing is built with upset forged ends — no welds, no weak link — and it anchors an expanding line of industry-compatible sonic tooling.

Ask any sonic driller where casing fails, and you'll hear the same answer: the weld between the end joint and the mid tube. Geoprobe^® 3.5 GPS sonic casing doesn't have one.

Instead of welding joints to a mid tube, the 3.5 GPS casing is manufactured with upset forged ends — a one-piece construction that removes the weld entirely. The forging process thickens the cross section at the tool joint, putting material exactly where the stress concentrates while keeping the mid tube thinner.

"When dealing with sonic tooling, the common failure point is where the end joint is welded to the mid tube. We were able to eliminate that failure point on the 3.5 GPS sonic casing," Jed Davis, tooling engineer, said. "Ultimately this makes for a stronger, more durable casing."

The result is casing that stands up to the vibration and stress sonic drilling puts on tooling — lasting longer in the field, with less downtime and lower replacement cost.

What Sets 3.5 GPS Casing Apart

• One-piece construction: No welded ends means no weld-related failure points.
• Upset forged ends: Thicker cross section at the tool joint for increased strength, paired with a thinner mid tube.
• Enhanced durability: Engineered specifically for the rigors of sonic drilling applications.

Part of a Full Sonic Tooling Suite

The sonic drilling industry has spoken: 4X6 sampling has become the standard, and Geoprobe® has responded with a full line of industry-compatible tooling built to the quality standards customers expect.

"Customers now recognize 4X6 sonic sampling as the industry standard," Davis said. "We developed industry-compatible 6-inch casing and 4X6 sampling components to meet that need."

• 3.5 and 6.0 GPS Sonic Casing: Building on the established 3.5 GPS casing, Geoprobe® now offers 6.0 GPS casing with industry-compatible threads. The one-piece, upset forged construction is unique to the 3.5 GPS casing, but both sizes deliver the same quality-controlled manufacturing and the availability you depend on to keep projects moving.
• 4X6 Sonic Sampling System: Every industry-compatible component the job requires, including 4.75 core barrels, bit options, drive heads, and core catchers.
• Legacy Tooling: Geoprobe® standard-duty and heavy-duty legacy sonic tooling remains stocked and ready for shipment. The sonic casing line is expanding, not shrinking.

On the Shelf, Ready to Ship

For sonic drillers seeking Geoprobe® quality in industry-standard sizes, tooling is available now.