Q series core barrel working procedure

1.  Starting drilling with PW series core barrel to 50m - 100m or minimum depth exceed the overburden, then putting in PW series casings tubes.

2.   Drilling with PQ series core barrel, then putting in HW series casing tubes.(PQ series drill rods can be used as casings without changing casing tubes)

3.  Drilling with HQ series core barrel, then putting in NW series casing tubes.(HQ series drill rods can be used as casings without changing casing tubes)

4.  Drilling with NQ series core barrel to the end of the holes.

5.  If NQ core barrel can not drill to the end of the hole, putting in BW casing tubes (or using NQ drill rods as casing tubes without changing the casing tube) and continuing drilling with BQ series core barrel to the end.