RETURN OF UNDERWATER PRODUCTION AND PROCESSING EQUIPMENT Russian patent published in 2016 - IPC E21B41/00 

FIELD: oil and gas industry.

SUBSTANCE: present invention relates to versions of system, which can be used to provide for return and/or replacement of equipment production and/or processing, used in underwater oil and gas. System comprises underwater equipment made with possibility to contain first fluid medium during operation in underwater environment and hydraulic accumulator communicated with underwater equipment. At that, hydraulic accumulator comprises first controlled chamber and second controlled accumulator chamber, as well as pressure barrier. Hydraulic accumulator pressure barrier can displace in response to pressure change on underwater equipment during lifting underwater equipment from underwater medium. First controlled accumulator chamber is configured to receive part of first fluid medium. Accumulator also can contain first movable piston, installed between first controlled accumulator chamber and second controlled accumulator chamber. First movable piston displaces in response to pressure change on underwater equipment during lifting underwater equipment from underwater medium. Accumulator can contain first valve arranged communicated with fluid medium with at least one of first and second controlled accumulator chambers. Also, hydraulic accumulator can contain valve, through which medium for equipment protection is supplied.

EFFECT: simplified design and prevention of flow termination during failure of equipment.

28 cl, 10 dwg