Turbo-coring device equipped with a following pipe

Details Turbo-coring device equipped with a following pipe Turbo-coring device equipped with a following pipe

E - Fixed Constructions

21

B

255/3

E21B 25/00 (2006.01) E21B 4/02 (2006.01) E21B 4/16 (2006.01) E21B 7/20 (2006.01) E21B 21/10 (2006.01) E21B 25/04 (2006.01)

Patent

CA 1139297

TURBO-CORING DEVICE EQUIPPED WITH A FOLLOWING PIPE ABSTRACT OF THE DISCLOSURE This turbo-coring device comprises a tubular body provided with a coring bit and surrounded by a following pipe provided by a reaming bit. The tubular body is connected to the turbine through a fluid distributor having a side opening for discharging above the following pipe in the annular space between the device and the bore- hole wall a fraction of the fluid leaving the turbine, while the re- maining fraction feeds the tubular body. The following pipe is connected to the outer wall of the fluid distributor through releasable bayonet type latching means. Means are provided for automatically closing the fluid dis- charge opening when the lower part of the tubular body becomes obtu- rated by ground formations and an annular sealing packer is positioned between the tubular body and the following pipe.

353868

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