Driven latch mechanism

摘要

Implementations include a core barrel assembly having a driven latch mechanism. The driven latch mechanism can lock the core barrel assembly axially and rotationally relative to a drill string. The driven latch mechanism can include a plurality of wedge members positioned on a plurality of driving surfaces. Rotation of the drill string can cause the plurality of wedge members to wedge between an inner diameter of the drill string and the plurality of driving surfaces, thereby rotationally locking the core barrel assembly relative to the drill string. Implementations of the present invention also include drilling systems including such driven latch mechanisms, and methods of retrieving a core sample using such drilling systems.

主权项

1. A core barrel head assembly, comprising:
a sleeve; a latch body moveably coupled to the sleeve; a driving member positioned at least partially within the sleeve; a landing member positioned at least partially within the latch body; a plurality of wedge members positioned on the driving member, wherein axial movement of the driving member relative to the plurality of wedge members moves the plurality of wedge members radially relative to the sleeve between a latched position and a released position, wherein the plurality of wedge members rotationally and axially lock the core barrel head assembly relative to a drill string when in the latched position; and a plurality of braking elements positioned on the landing member, wherein axial movement of the landing member relative to the plurality of braking elements moves the plurality of braking elements radially relative to the latch body between a retracted position and an extended position.