A unique combination of -20 degree self-locking reverse flank angle on the threads and symmetrical load distribution when combined with W-Wall™ double-annealed mid-body, make XQ™ wireline coring rods some of the deepest rated coring rods in the market.
Self-Locking Reverse Flank Angle
XQ has an increased negative flank angle from of -20 degrees compared to -10 degrees in RQ™ rods. The increased negative flank angle combined with the double-start threads, nearly eliminate box bulging and provides greater strength in high torque applications.
Symmetrical Load Distribution
Patented XQ joints have opposite double-start threads that are self-aligning so mating engages smoothly. This provides a balanced load response and double the contact area, which means half the contact pressure. This symmetrical load distribution increases load capacity significantly for stronger rods with deeper capacity.
W-Wall™ Double Annealed Mid-Body
W-Wall has a more uniform bend distribution like straight wall, stiffness comparable to Boart Longyear’s variable wall rod, V-Wall™. The result is a rod with flexibility for ease of directional work that holds up better than V-Wall. Boart Longyear™ rods are put through a proprietary process during manufacturing to remove all residual stress and maximize strength and resistance to bending.
Longer lasting rods means getting more meters per rod and replacing rods less often, directly adding value to the bottom line.
Pin Case Hardening
Case hardening is unmatched in protecting threads from wear. Other drill rods are typically through-wall hardened to 32 HRC. Boart Longyear coring rods are case hardened on the pin thread to maximum hardness – 60 HRC, creating a significant hardness difference between pin and box. This difference minimizes wear compared to the rapid galling that other threads experience. In repeated “make and break” field testing, other non-case-hardened rods were shown to fail at between 12 and 73 cycles, whereas XQ joints withstood more than 600 cycles.
XQ double-start mating threads engage smoothly with innovative self-aligning geometry providing decreased wedging and jamming. Smooth starting, in combination with case hardening, significantly improves both productivity and wear life for the longest lasting rod threads.
The double-start threads on XQ rods balance out the drilling load stresses. Combined with the double-start thread, the increased negative flank angle virtually eliminates box bulging and results in better box wear. Box and thread wear are typically why well-maintained coring rods are retired.
Often variable wall rods used in directional drilling work are retired for thin mid-bodies prior to other failure modes. Thicker mid-bodies (standard wall thickness material in the center of the mid-body) virtually eliminates this failure mode in W-Wall. In directional work, other variable wall rods will wear thin in the mid-body center and need to be retired. W-Wall has the same mid-body wear life as straight wall rod so you can take advantage of all of the benefits of a lighter drill string and faster wireline tripping and still have longer lasting rods.
EASIER MAKE AND BREAK
Patented XQ Mating Joints
Opposite double-start threads are self-aligning so mating engages smoothly. XQ mating joints nearly eliminates jams for the best make and break around. They also eliminates the driller assistant back-turning to thread the joints for better safety and productivity.
Imagine not having to send the driller assistant back near energized components to have them 100% back turn the rod to mate the threads or trying to mate the threads by hand at all. XQ Rods keep workers safer by keeping them away more often. Plus, more meters can be drilled because less time is spent mating threads.
XQ rods have two threads per inch for reduced rotation and easier manual make up. When making joints by hand, rotation places stress on wrist. Threads with less rotation are faster to make up and generate less fatigue and potential for repetitive use injuries. The driller assistant spends less time trying to mate threads – for more meters and core in the box.
Rod handlers improve safety by keeping helpers away from energized components and potential injury from wrenches under power. Coring rod threads will jam in 20-30% of joint make-ups, meaning that time is lost, and 5% of the time the helper is back near the rotation unit, reducing safety. These jams add significant unproductive time either to unjam threads or rotate threads backward 100% of the time when manually making joints.
The patented XQ rods feature a unique thread entry, nearly eliminating jams, upgrading safety for hands-free rod handling, where making and breaking of rods is mechanized. XQ threads also feature a coarser pitch with less rotation, making them faster to make up by hand, generating less fatigue, lower stress on the wrist and less potential for repetitive use injuries.
Improved Wireline Tripping Speed
Wireline time, especially on deep holes, is a significant portion of time spent drilling. Measurable savings in wireline time adds significant productivity. The larger inner diameter of W-Wall tubing has more space to allow drilling fluid to pass by inner tube assemblies during wireline tripping, making wireline tripping up to 50% faster.
On an 800 meter hole, simply changing from straight wall to W-Wall rod can save 2 shifts or put 20% more core in the box.
Boart Longyear’s V-Wall™ tubing option on RQ rods made drill strings up to 30 percent lighter, thanks to its thin-walled mid-body. The lighter drill string increased drill rig depth capacity and reduced fatigue in driller's when manually tripping. The enlarged inner diameter also significantly reduced inner tube tripping time for improved productivity.
The new NXQ™ and HXQ™ W-Wall coring rods feature patent-pending, double-upset tubing, with the same overall weight reduction and faster wireline tripping speed as V-Wall. However, the standard wall thickness in the middle of XQ rod eliminates premature mid-body wear and resists bending, performing like straight wall tubing.
As all Boart Longyear coring rod, XQ W-Wall tubing is cold-drawn from high quality, North American alloy steel, uniquely processed to Boart Longyear specifications.
Patented XQ™ Wireline Coring Rods
The new XQ thread provides the smoothest making and breaking of any rod I have used in my 25-year career in drilling.
“The new XQ thread provides the smoothest making and breaking of any rod I have used in my 25-year career in drilling. The XQ rods align better and don’t require back-turning the rods to start – saving time. Jamming rods during making and breaking lowers productivity, so not having the rods jamming means more meters. The XQ rods coming out of the hole are not showing the typical box or thread wear, which means the rods last longer too. The strength and depth capability are by far the best in the market. When drilling deep holes that need to hit specific targets or underground drilling, this rod outperforms them all. I highly recommend the XQ wireline coring rods.”
Division Manager, Coring, Canada for Boart Longyear
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