CPC E21B 25/10 (2013.01) [E21B 10/02 (2013.01); E21B 10/26 (2013.01); E21B 10/44 (2013.01); E21B 10/605 (2013.01); E21B 34/06 (2013.01)] | 10 Claims |
1. A coring device comprising a core drilling tool, a core catcher, a rock core barrel, a drilling machine outer cylinder, a flap valve, and an inner rod for pulling the rock core barrel,
wherein the core catcher is disposed inside a lower end of the rock core barrel,
the core drilling tool comprises an outer core tube and a hollow drill bit, an upper end of the outer core tube is connected to a lower end of the drilling machine outer cylinder, and
a lower end of the outer core tube is connected to the drill bit,
a lower end of the inner rod protrudes into the rock core barrel and is movable axially by relative to the rock core barrel,
the flap valve comprises a valve seat and a sealing flap, the valve seat is coaxially mounted on an inner wall of the drilling machine outer cylinder, and one end of the sealing flap is movably connected to an outer sidewall of the upper end of the valve seat,
a top of the valve seat is provided with a valve port sealing surface matched with the sealing flap, and
when the rock core barrel is located in the valve seat, the sealing flap opens 90°; when the rock core barrel is lifted up by means of the inner rod so that the sealing flap returns to the top surface of the valve seat and is in a sealing contact with the sealing surface of the valve opening.
|