E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 25/00 (2006.01) E21B 25/10 (2006.01) E21B 49/06 (2006.01)
Patent
CA 2378186
The present invention provides a core sample retaining sleeve for preventing loss of a cut core sample from the distal end of a coring bit, particularly during retraction of the coring bit to within the coring tool. Preferably, the core sample retaining sleeve is disposed concentrically within the coring bit to fit around the received core sample. The core sample retaining sleeve has one or more retaining fingers formed on the distal end of the coring bit. The retaining fingers are selectively closeable, preferably by urging the one or more retaining fingers against one or more guide members. A guide member is preferably provided as a stationary ridge on the inner, distal surface of the coring bit. The core sample is contained and protected within the closed retaining sleeve.
Contreras Gary W.
Harrigan Edward
Hill Bunker M.
Lauppe Dean
Sundquist Robert Wayne
Schlumberger Canada Limited
Smart & Biggar
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