Core orientation instrument

Details Core orientation instrument Core orientation instrument

E - Fixed Constructions

21

B

33/92

E21B 47/02 (2006.01) E21B 25/16 (2006.01) E21B 47/022 (2006.01)

Patent

CA 1195491

ABSTRACT "CORE ORIENTATION INSTRUMENT" An instrument for determining the orientation of [the] a borehole or core sample utilizing a plumbed compass ball which is held in a gellable liquid within a container passed [down the borehole. The] through a wireline drill spring. Once the instrument is positioned as desired, the liquid is gelled [thus fixing the position of the compass ball relative to the instrument once it is positioned as desired. The liquid is gelled] by the forced injection of a catalyst normally held in a piston/cylinder reservoir and separated from the liquid by a spring loaded one way valve. Injection is caused by [hydraulic] pressure applied to a portion of the piston by drill fluid. [The hydraulic] Application of the pressure is controlled by a sleeve and port valve which is opened by telescopic movement of two cylindrical partially co-extensive coaxial members. - 2 -

447158

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