ABOVE-WATER CIRCULATING HEAD Russian patent published in 2020 - IPC E21B33/35 E21B34/04 E21B21/10 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil and gas industry and is intended for underwater production of hydrocarbons in access system to well, operations of well servicing with application of self-elevating floating drilling rig, semi-submersible drilling rig, drilling vessels or stationary platforms. Surface circulation head comprises load-carrying housing with central channel and branch pipe for connection with elevator. Branch pipe is installed projecting relative to load-carrying housing coaxially to central channel. Discharge line of the killing line extends from the load-carrying housing perpendicular to the central channel. Gate valve of killing line with automatic emergency shutdown device and installed in it pressure sensor is installed protruding relative to load-carrying housing perpendicular to central channel. Adapter for connection with riser is installed projecting relative to load-carrying housing coaxially to central channel and opposite to connecting pipe. Unit of double shut-off valves is located opposite to damper of damping line. Manometer and control panel are arranged on load-carrying housing. Tubing is intended for supply of hydraulic fluid to slide valve and unit of double shut-off valves.

EFFECT: high reliability and safety of operation in sea conditions owing to simplified design and reduced risks of emergencies, particularly leaks of the well fluid into sea water.

4 cl, 4 dwg