Oil feild drill pipe 1.type:integral type and friction weld type 2.integral type:AISI4145HM 3.Connection number:6 5/8''FH Oil feild drill pipe Two intergral production lines for friction-welded drill pipe have beeb imported from Japan.Pipes range from 2 3/8'' to 6...

inside drill bits 1.drill bits diameter 76mm 2. drill hole diamete 85-100mm inside drill bits Technology parameter table 1.drill bits diameter    76mm2. drill hole diamete   85-100mm3.Applicable scope    Pebble soil and rock laye...