Core barrel sealing structure capable of increasing sealing specific pressure

Abstract

The invention relates to a core barrel sealing structure capable of increasing the sealing specific pressure. The core barrel sealing structure comprises a core barrel, a drilling machine outer barrel, a chain mail flap valve and a trigger mechanism. The chain mail flap valve comprises a valve seat and a chain mail valve clack. The trigger mechanism comprises a trigger inner barrel and a trigger block. The trigger block is arranged in a through hole in the sidewall of the trigger inner barrel. The inner wall of the drilling machine outer barrel is provided with a receding port matched with thetrigger block. When the core barrel is located in the valve seat, the valve clack is opened by 90 degrees and is located between the trigger inner barrel and the drilling machine outer barrel. When the core barrel is lifting upwards to a certain height, the valve clack returns to the top surface of the valve seat to make sealing contact with the sealing surface of a valve port, and the bottom ofthe trigger inner barrel is pressed on the valve clack. The core barrel sealing structure achieves lower-end sealing through the chain mail flap valve. The deformability of the valve clack is high andcan automatically adjust the sealing matching position and is high in matching success rate and reliable in sealing performance. Moreover, the valve clack has the reverse self-locking property duringpressure maintaining and pressure bearing and also is pressed by the fallback trigger inner barrel. The sealing specific pressure is large. The sealing performance is reliable.

Description

technical field [0001] The invention relates to the technical field of coring equipment, in particular to a core barrel sealing structure capable of increasing the sealing specific pressure. Background technique [0002] At present, in the field of pressure-holding coring, the upper end of the pressure-holding cylinder is generally sealed by a piston, and the lower end of the pressure-holding cylinder is usually sealed by a ball valve or a flap valve. The structure of the ball valve is relatively complex and occupies a large space, which limits the diameter of the drilled core. The processing technology of the ball valve is high, and when the pressure is high, the liquid in the pressure-holding cylinder will leak from the gap between the ball valve and the core cylinder. Can not maintain a higher pressure; and the existing flap valve, although the structure is simple, can maintain a higher pressure, but its valve disc is a fixed shape, can not be deformed, with a low success...

AI Technical Summary

Problems solved by technology

The structure of the ball valve is relatively complex and occupies a large space, which limits the diameter of the drilled core. The processing technology of the ball valve is high, and when the pressure is high, the liquid in the pressure-holding cylinder will leak from the gap between the ball valve and the core cylinder. Can not maintain a higher pressure; and the existing flap valve, although the structure is simple, can maintain a higher pressure, but its valve disc is a fixed shape, can not be deformed, and the success rate of cooperation is low; Poor sealing performance under pressure

Images