CR-650 is a high molecular weight, powdered polymer which has been developed to improve core recovery, particularly in broken and sandy formations. It may also be used to stabilize reactive clays and shales and to provide lubrication when diamond drilling in bad conditions.
Add to Fresh Water Under normal drilling conditions – 0.5 to 0.75 kg/1,000 litres.
To stabilize swelling clays and shales – 0.75 to 1.0 kg/1,000 litres.
To improve core recovery in sandy, friable formations and to increase hole stability – 1 to 2 kgs/1,000 litres.
CR-650 should be mixed by adding slowly through a jet tunnel or high speed stirrer.
