Boart Longyear

The Quick Descent™ core barrel head assembly provides the driller with the most reliable wireline technology in the business-including the robust, vibration-resistant Link-Latch system. Featuring the updated detented link-latch design, true latch indication and an innovative hollow spindle (H & P only), the Quick Descent core barrel offers the potential to increase core barrel descent speed by up to 50%.

Available in B, N, H, and P sizes, the new Quick Descent core barrel draws on three distinct design improvements:

Detented link latch (all sizes)
Improved, patents-pending detented Link Latch design enables smooth inner-tube travel and eliminates drag against the rod string inner-wall during descent. When retracted, the latches are completely hidden inside the latch case - allowing the core barrel to travel freely through the rod string.

Latch indication (all sizes)
The redesigned fluid control valve provides a positive latch indication signal. This design improvement goes far beyond existing systems that only give landing feedback ñ drill operators will now see a drilling fluid pressure spike when a positive latch has occurred.

Hollow spindle (H & P only)
Our unique hollow spindle allows fluid to pass easily though the core barrel-significantly increasing drop speed. The hollow spindle passes 2.0 L/s (31gpm) at 100kPa (15 psi) compared to our standard core barrel at 1.2 L/s (19gpm) which relies on the inner-tube outer annulus for all fluid transmission.