Study and application of coring tools SZ-65 with drilling technology

Coring with drilling technology realized coring without make a trip,and saved time,decreased drilling operation cost.Coring tools with drilling SZ-65 was developed.When drilling to coring depth,the tools processed coring operation through put inner core shell and spear assembly into drill pipe after fishing out inner-tube and bit,the tools was applied in 9 wells,obtained 31 barrel cores,drilling footage to(68.87) m and get 56.96 m cores.Core recovery reached to(82.71)%.