Used for acquisition of sample of rock core in petroleum drilling
One to three sections of the barrel can be run at one time
Suitable for soft, mid-hard, hard and tattered stratum
Type Chuan 7-4 is an ideal coring tool with advanced technology and good corollary equipments, designed on the base of the improvement of Chuan 8-3 and Chuan 6-3
Construction and technical standards:
Consists of safety sub, steering assembly, stabilizer, outer, inner barrel, card hoop assembly and coring bit
Size of outer barrel (OD x ID x wall thickness): 172 x 136 x 18mm
Size of inner barrel (OD x ID x wall thickness): 121 x 105 x 6.5mm
Include : Kelly valves ; drill stem subs ; threading for rotary shouldered connections
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