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A core drilling mechanism in an elongate housing is rotated from a vertical storage position to a horizontal operable position. This permits the transport downhole of a drilling mechanism of sufficient longitudinal dimension to drill a core sample of substantial length perpendicular to the borehole

A core drilling mechanism in an elongate housing is rotated from a vertical storage position to a horizontal operable position. This permits the transport downhole of a drilling mechanism of sufficient longitudinal dimension to drill a core sample of substantial length perpendicular to the borehole sidewall. A fixed slotted plate and hydraulically actuated rotatable drive plate control the motion of the drilling mechanism, which is stored vertically for descent and ascent, and rotated 90-degrees and moved outward for core drilling. After a core sample is drilled, the drilling mechanism is tilted upward to break off the core, and then returned to its vertical storage position.

대표청구항 ▼

A device for cutting a core from the sidewall of a borehole comprising: an elongated housing lowerable into the borehole; means for anchoring said housing at a desired position in the borehole; at least one guide plate fixedly mounted inside said housing in a generally vertical position, said guide

A device for cutting a core from the sidewall of a borehole comprising: an elongated housing lowerable into the borehole; means for anchoring said housing at a desired position in the borehole; at least one guide plate fixedly mounted inside said housing in a generally vertical position, said guide plate having therein a J-shaped slot with an elongate leg thereof disposed in a generally horizontal position and a shorter leg extending upward therefrom; core drilling means; first and second pins extending from the side of said drilling means into said J-shaped slot of said at least one guide plate, and arranged in a line parallel to an axis of said drilling means; and drive means for driving said first pin along said J-shaped slot for pivoting said drilling means between a substantially vertical position and a substantially horizontal position, said drive means including a drive plate pivotally mounted to said housing, means for coupling said drilling means to said drive plate for pivotal movement therewith and means for pivotally moving said drive plate to drive said first pin along said J-shaped slot.