Extremely Abrasive formation & Losses

28 July 2016 Need your suggestions on drilling extremely hard & abrasive sands, we have used several PDC bits [ 6,7 & 8 bladed with 13,16 mm cutter size] that have come as cored out , Tri-cone comes out with dull grades of 5-6 & gauge damaged badly, [ IADC 437,517,627] have been used, with no success, Max ROP is 0.6-1 m/hr.
Now Impreg is out of consideration, since we are keeping LCM in active system to tackle losses, so motor or turbine cannot be used along with the Impreg.
What is your experience with this? And any suggestion to drill this interval? 
We are drilling this in 17" hole btw.

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