PUMPING SYSTEM Russian patent published in 2016 - IPC E21B43/01 E21B33/64 

FIELD: pumps.

SUBSTANCE: disclosed is a group of inventions related to underwater pumping system, a unit for interaction with blowout preventer and control method for hydraulic slip of underwater blowout preventer in oil or gas well. Underwater pumping system is configured to close the hydraulic slip of blowout preventer. It comprises multiple pumps and includes at least first pump and second pump. These pumps are made with possibility of pumping fluid from the fluid source to hydraulic slip. Each of the pumps has driving side to control pump and fed with drive fluid from the fluid source, and driven side configured to be supplied with the fluid of the same hydraulic slip. System comprises control device configured to select at least one pump from said first and second pumps to pump the fluid to hydraulic slip by selective supply of fluid medium from a source of drive fluid to the drive side of at least one of said first and second pumps. First pump is made with possibility of pumping the fluid medium at higher consumption rates than the second pump. Second pump is made with possibility of pumping the fluid medium at higher pressures than the first pump. Thus control device provides the possibility of actuation of the first pump at lower fluid pressure range and actuation of the second pump at the upper range of fluid pressure.

EFFECT: technical result is higher reliability and raising of method efficiency.

19 cl, 3 dwg