GeoproHYDRA™ NGX™ NRGZ™

The  GeoproHYDRA™ NGX™ system is a multi-chamber patent pending ultra-high speed reamer system. The multi-chamber design enables low flow operability typically at the same flow rate the competitions' technology only just start to activate.

Low flow operability affords drilling and completion engineers the ability to manage ECD better across pressure sensitive formations such as thief zones and highly depleted permeable formations.

The  GeoproHYDRA™ NGX™ was designed specifically to handle loss circulation material while also managing operability and ECD management. This was first deployed by a client in Thailand (please see SPE Paper 207717 for details).  The standard tool has a minimum restriction of 15mm diameter which is just under diameter of size 19/32nd nozzles on a drill bit. Which means whatever you can pump through a size 18 nozzle can be pumped through these radial ports which pan out to an ellipse with minor and major axis of 15mm and 30mm respectively or equivalent to a size 30/32nd nozzle on a drill bit. 

The  GeoproHYDRA™ NGX™ reamer shoe is a low pressure system. Typical pressure drop across the entire tool is  between 1.0 and 1.25 psi/gpm. Unlike turbine and inverser Moineau based technologies, there is zero (0) stall pressure associated with the tool since it does not stall in the classic sense which is where the rotor deforms within the stator since it does not have a rotor or stator configuration. This makes it the ultimate essential for deploying pressure sensitive strings and equipment downhole.

The  GeoproHYDRA™ NGX™ is a direct jet drive system which essentially diverts and directs flow unto an impeller blade assembly to create rotation.

Geopro uses TCIs in preference to PDC cutters on the  GeoproHYDRA™ NGX™  to reduce friction generated when running in hole or when operating. This low friction is further enhanced with the NGX2 move from spiral to straight bladed profiles. Furthermore, the use of TCIs rather than PDC cutters creates better stand-off and much better flowby area across the tool.

TCIs have been very successful on the  GeoproHYDRA™, just as in tricone bits and roller reamers, and we continue this tradition in the  GeoproHYDRA™ NGX™2 NRGZ™ system

The  GeoproHYDRA™ NGX™ 2 system is highly optimised for drilling out in comparison to the NGX1 system. For example the entire weight of the 7 inch NGX1 system, a very successful tool introduced to the industry in 2020, was 219 lbs whereas the NGX2 system is 154 lbs. Thats a 65 lbs (or 29.4 kg) weight reduction. The actual mass of aluminium to be drilled out is now 17.2 lbs instead of 37.5 lbs, representing a 55% reduction in  weight. The actual material to be drilled out is significantly less than this volume since some of the Aluminium makes up the threaded aspects of each assembly. Drill out time with a constant weight on bit, typically 10 kips or more and 60 RPM with a PDC bit should be completed in +/- 30 minutes.

The 2SL™ - shift and shear locking system has been developed for those operations where over-displacement of the cement slurry is a regular practice of where there is typically total losses at the shoe when cementing and no cement present when drilling out. The  2SL™ system enables the GeoproHYDRA™ NGX™ system to be locked such that the stabilized housing does not rotate when drilling out the shoe. This required WOB to drill out is set prior to delivering the tool at the wellsite and this is achieved using a set of several shear pins.

The  GeoproHYDRA™ NGX™  NRGZ™ drive mechanism utilises a high efficient impeller plade profile and a high impact, high accuracy jet system to create a 97% hydraulically efficient drive system in an already successful system. The NGX system performed better than the original concept with less than  ⅓ the energy input (flow rate), while the  NRGZ™ drive system, on the other hand, further improves the NGX performance by an additional 25% across all tool sizes. The result is a 7  inch,  9⅝ inch, 10¾ inch or 13⅜ inch tools activating at <25, <35, <50 and <100 gpm with efficient operability at 80, 120, 150 and 225 gpm respectively.