Electrical accumulator system with internal transfer barrier

1 . A system comprising:

a first accumulator system;

a second accumulator system, wherein at least one of the first accumulator system and the second accumulator system includes:

a motor housing comprising an electric motor;

a function chamber coupled to the motor housing;

an anti-rotating chamber coupled to the motor housing;

a balance chamber;

a transfer chamber disposed between the anti-rotating chamber and the balance chamber;

a shaft configured to move axially within the function chamber, the anti-rotating chamber, and the transfer chamber;

a first piston coupled to a first end of the shaft;

a second piston coupled to a second end of the shaft, wherein the electric motor is coupled to and drives the shaft to alternatingly compress working fluid with the first piston in the function chamber to drive the working fluid out of the function chamber, and compress transfer fluid with the second piston in the transfer chamber to drive the transfer fluid out of the transfer chamber; and

a third piston configured to separate the transfer chamber from the balance chamber;

an electronic module comprising a battery system, the electronic module being electrically coupled to the first accumulator system and the second accumulator system; and

a drilling component hydraulically coupled to the first accumulator system and the second accumulator system.

2 . The system of claim 1 , wherein the drilling component is a blowout preventer.

3 . The system of claim 2 , wherein the first accumulator system and the second accumulator system are configured to pressurize the working fluid to actuate a dedicated shear ram of the blowout preventer.

4 . The system of claim 3 , wherein the blowout preventer comprises at least one shuttle valve.

5 . The system of claim 1 , wherein the electronic module further comprises a variable frequency drive for driving the first accumulator system and the second accumulator system.

6 . The system of claim 1 , wherein the electronic module further comprises a charging system for providing a trickle charge to charge one or more batteries of the battery system.

7 . The system of claim 5 , wherein the electronic module further comprises a charging system for providing a trickle charge to charge one or more batteries of the battery system.

8 . The system of claim 1 , further comprising: a trigger valve that is configured to send a command to the electronic module to activate a sequence to drive the at least one of the first accumulator system and the second accumulator system after an emergency event is detected.

9 . The system of claim 8 , wherein the sequence is based on a predefined time and pressure curve.

10 . The system of claim 8 , wherein the sequence is based on an idealized shear pressure versus time profile.

11 . A method comprising:

obtaining a blowout preventer stack assembly comprising: a lower marine riser package connected to a blowout preventer package, the blowout preventer stack assembly connected in line between a wellhead assembly and a floating rig through a riser;

detecting an emergency event;

in response to the emergency event, sending a command to an electronic module comprising a battery system, the electronic module being electrically coupled to at least one accumulator system on the blowout preventer package, wherein the at least one accumulator system includes:

a motor housing comprising an electric motor;

a function chamber coupled to the motor housing;

an anti-rotating chamber coupled to the motor housing;

a balance chamber;

a transfer chamber disposed between the anti-rotating chamber and the balance chamber;

a shaft configured to move axially within the function chamber, the anti-rotating chamber, and the transfer chamber;

a first piston coupled to a first end of the shaft;

a second piston coupled to a second end of the shaft, wherein the electric motor is coupled to and drives the shaft to alternatingly compress working fluid with the first piston in the function chamber to drive the working fluid out of the function chamber, and compress transfer fluid with the second piston in the transfer chamber to drive the transfer fluid out of the transfer chamber; and

a third piston configured to separate the transfer chamber from the balance chamber;

activating a sequence to drive the at least one accumulator system;

using the at least one accumulator system to hydraulically actuate a component of the blowout preventer package to a closed position; and

pressurizing the transfer fluid to actuate the component of the blowout preventer package to an open position, wherein the at least one accumulator system and the component of the blowout preventer package create a closed loop.

12 . The method of claim 11 , wherein the emergency event comprises the lower marine riser package disconnecting from the blowout preventer package.

13 . The method of claim 11 , wherein the emergency event comprises loss of at least one of; power, communications, and hydraulic connection between the blowout preventer stack assembly and the floating rig.

14 . The method of claim 11 , wherein the component of the blowout preventer package is a blind shear ram.

15 . The method of claim 11 , wherein the component of the blowout preventer package is a casing shear ram.