High-bearing-pressure low-torque top drive plug valve

Abstract

The invention belongs to the technical field of petroleum and natural gas well control, and particularly relates to a high-bearing-pressure low-torque top drive plug valve. Comprising a valve body, an upper valve seat, a valve element and a lower valve seat are arranged in the valve body, the valve element is arranged between the upper valve seat and the lower valve seat, the valve element and the upper valve seat are sealed through curved surface fit, and the valve element and the lower valve seat are sealed through curved surface fit; the curved surface on the valve element comprises a non-contact section, a variable contact section and a transition section which are sequentially connected. Compared with a traditional spherical arc contact surface, the plug valve element, the upper valve seat and the lower valve seat have a larger sealing area through the design concept of'variable contact ', the rigidity of the contact surface can be effectively increased, and the contact pressure between the valve element and the upper valve seat and the lower valve seat is uniform, so that the contact state between the valve element and the upper valve seat and the contact state between the valve element and the lower valve seat are self-adaptive to the change of fluid in a tubular column; the attaching degree of the valve element and the upper and lower valve seats is improved, the phenomenon of untight sealing is reduced or eradicated, and the service life of the plug valve is prolonged.

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