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Slick Drill Collar

Drill Collar

Time Rolling slick drill collars are made from 4145H modified chromium-molybdenum alloy steel according to API Spec 7.

All threads can be phosphated, copperised or cold working.

All threads are machined with CNC Lathes-Double- Shouldered and a special thread, the max. diameter of the drill collar is 14 inches.

Non-magnetic Drill Collar

The materials of the Time Rolling's non-magnetic drill collars are made from chrome manganese, low carbon obtained by combining a proprietary chemical analysis and a rotary hammer process.

The material is resistant to stress corrosion cracking, with high machine ability and without tendency to gall.

Magnetic permeability (when MPS=1105/4Nm) relative max μr:1.010. Magnetic field gradient (hot spots) max: B 0.05micro tesla/100mm.

Spiral Drill Collar

The spiral drill collars are made from 4145H modified chromium-molybdenum alloy steel according to API Spec 7.

All threads can be phosphated, copperised or cold working. They are machined with CNC Lathes-Double-Shouldered and a special thread, the max. diameter of the spiral drill collar is 14 inches.

Out diameter: 3 7/8"~ 14"(inch) Depth of cut: 4.0 ~ 11.9 (mm) Length: 9,150+150(mm)

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