Bits ‘n Pieces – The Driller’s Blog

Limiting Unexpected Water Flow for Better Core Recovery

Posted by Rod McCoremick on Jun 13, 2016 10:30:00 AM


Even with a lot of drilling experience, drillers can encounter the unexpected. One of those unexpected drilling situations is having to cross a zone with high pressure and high flow ground water. This can slow down or stop drilling resulting in poor results for operations. 



Check out this video for an example of the type of situation you can encounter. Luckily, when drilling problems arise often enough, a product is developed to address the particular issue. This was the case with high pressure water inflow zones and the need to recover core samples.

The AquaGuard system is an example of a product that was developed to limit water flow so that drilling and core recovery can continue. It is suitable for both surface and underground drilling.

geysar.jpgHow does it work? The system has a valve that limits the water from flowing into the drill string when positive pumping pressure is off. The valve closes on itself, similar to a check valve, when the inner tube is recovered using wireline coring methods.

When the inner tube is pumped back into the hole, the AquaGuard valve reopens to allow the tube to gain its locked position. To create space for the AquaGuard valve in the rods, the system’s core bit has a wider kerf (or cutting area), reducing the core to one size smaller than the actual hole.

 Core recovery can be greatly reduced when you are faced with water spouting out a hole. There can also be a risk of the inner tube exiting the drill hole due to excess water pressure. Changing or adding a rod can take much longer and can result in water pouring into the drill station – not a pleasant situation for anyone. All in all, having to deal with high water inflows can be strenuous and time-consuming.

Want to make sure your crew isn’t taking a shower while at work? Sound like something you may need? Read about the results one customer achieved once they limited water inflow.



CONCLUSION:

Want to make sure your crew isn’t taking a shower while at work? Sound like something you may need? Read about the results one customer achieved once they limited water inflow.



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