Coring apparatus

摘要

A formation coring apparatus suitable for coring relatively soft formations which apparatus includes a core barrel with an interior surface having properties similar to synthetic rubber and two semitubular rigid portions joined along at least one of the adjacent edges by a flexible material, a core catcher having a plurality of flexible segments adapted to open while the core is being drilled and to close with the segments supporting the core thereabove to recover the core, a coring bit and a wire line tool adapted to carry the core barrel and the core catcher into position within the coring bit and having a fishing neck to be engaged by a wire line device for recovery, a latch for retaining the tool in position within the coring bit, a swivel allowing the core barrel and catcher to remain stationary while the coring bit is rotated and a check valve allowing fluid flow from the top of the core barrel because of the entry of the core therein to flow out the tool while preventing inflow of fluids into the top of the tool.