RESERVE STOCK OF PIPES AND SCREENS The company puts a reserve stock of spare parts for all types of drilling rigs at the disposal of its crew. 5000 m of 9”5/8 steel casing. 2500 m of 13”3/8 steel casing. 2000 m of 6”5/8 “Johnson” screens. 1500 m of 8”5/8 “Johnson” screens. 4000 m PVC tubes