WELLHEAD VALVE FOR PRESSURE RELIEF Russian patent published in 2023 - IPC E21B34/02 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the protection against emergency pressure drops between the well annulus and the flow line in both directions. A wellhead pressure relief valve contains a body with a channel equipped with a seat and a shut-off element spring-loaded from the stop to the seat, allowing passage from the annulus to the flow line. The body has an additional channel, equipped with an additional seat and an additional locking element spring-loaded from the stop to this seat, allowing passage from the flow line into the annulus. The force of pressing the shut-off elements to the seats is selected so as to exclude a pressure drop that exceeds the emergency value for the corresponding structural elements of the wellhead equipment. On the side of the flow line, a glass with a coaxial rod is installed coaxially with the body, made with the possibility of longitudinal sealed movement relative to the glass. The rod is equipped with a tip with an end pusher, designed to interact with the locking element and press it away from the corresponding seat when the pusher is manually moved towards the body.

EFFECT: providing the possibility of forced pressure equalization in manual mode in the flow line or annulus of the well before dismantling the wellhead equipment to eliminate the negative impact of the well fluid on the natural ecology.

1 cl, 2 dwg