FIELD: oil and gas industry.
SUBSTANCE: group of inventions is referred to oil and gas producing industry ands may be used in operations performed in underground wells at drilling. The system includes hydraulic accumulator interconnected to the borehole, at that hydraulic accumulator delivers pressure to the borehole, union which restricts fluid flow from the well with pressure regulation. The hydraulic accumulator is connected to return line between the unit of blowout preventers and choke manifold. The hydraulic accumulator is designed to deliver pressure to the borehole even when fluid does not flow through the union.
EFFECT: improvement in efficiency of pressure control.
21 cl, 3 dwg
