... collar 2) PDC drillable 3) Thread: BTC/ LTC / STC 9- 5/8" casing float shoe & float collarA rounded profile ... component attached to the downhole end of a casing string. An integral check valve in the ... : 13-3/8" float collar N80, 68 ppf, BTC 9-5/8" float collar N80, 47 ppf, BTC 7" ... float collar N80, 29 ppf, BTC 9 5/8" casing float shoe and float collar