WELL HEAD FOR PRESSURE RELEASE Russian patent published in 2020 - IPC E21B34/02 

FIELD: oil, gas and coke-chemical industries.

SUBSTANCE: invention relates to oil and gas industry, namely to devices of wellhead equipment for protection against emergency pressure drops between annular space of well and discharge line in both directions. Well pressure valve for pressure release contains housing with channel equipped with seat and shutoff element spring-loaded from stop to seat, which passes from annular space into discharge line. Housing is equipped with an additional channel equipped with an additional seat and an additional element spring-loaded from the stop to this seat, which passes from the discharge line to the annular space. Force of locking elements pressing to seats is selected so that to exclude pressure difference exceeding emergency value for corresponding structural elements of wellhead equipment.

EFFECT: technical result is improved reliability of wellhead equipment protection against emergency pressure drops due to possibility to automatically release pressure from well annulus into discharge pipeline in automatic mode or vice versa.

1 cl, 2 dwg