Abstract: A blowout preventer (BOP) stack module includes a chassis core having a module frame, wherein the chassis core supports one or more submodules each configured to perform a function of a BOP stack, an underwater vehicle coupling hardware coupled to the chassis core, wherein the underwater vehicle coupling hardware couples with an underwater vehicle configured to transport and selectively couple and uncouple the BOP stack module relative to the BOP stack, and a mechanical connector coupled to the chassis core, wherein the mechanical connector couples to a stack frame of the BOP stack, and at least one port coupled to the chassis core, wherein the at least one port is a fluid port, a hydraulic port, a pneumatic port, an electrical port, or a combination thereof, wherein the at least one port couples with a corresponding port of the BOP stack.

Abstract: A blowout preventer (BOP) stack module includes a chassis core including a module frame, a remotely operated underwater vehicle (ROV) coupling hardware coupled to the chassis core, wherein the ROV coupling hardware couples with an ROV configured to transport and selectively couple and uncouple the BOP stack module relative to a BOP stack, a mechanical connector coupled to the chassis core, wherein the mechanical connector couples to a stack frame of the BOP stack, an electrical BOP component coupled to the chassis core, wherein the electrical BOP component performs one or more electrical BOP functions of the BOP stack, and an electrical connector coupled to the chassis core and the electrical BOP component, wherein the electrical couples to a corresponding electrical connector of the BOP stack or an adjacent BOP stack module.

Abstract: An underwater vehicle is configured to transfer a payload between a first location and a second location at a subsea structure. The underwater vehicle includes a payload support configured to support the payload and a buoyancy control system. The buoyancy control system includes at least one of an exchange weight system configured to receive one or more exchange weights when delivering the payload, a floatation system having one or more floatation devices coupled to the payload, or a combination thereof.

Abstract: A blowout preventer (BOP) stack module includes a chassis core having a module frame, wherein the chassis core supports one or more submodules each configured to perform a function of a BOP stack, an underwater vehicle coupling hardware coupled to the chassis core, wherein the underwater vehicle coupling hardware couples with an underwater vehicle configured to transport and selectively couple and uncouple the BOP stack module relative to the BOP stack, and a mechanical connector coupled to the chassis core, wherein the mechanical connector couples to a stack frame of the BOP stack, and at least one port coupled to the chassis core, wherein the at least one port is a fluid port, a hydraulic port, a pneumatic port, an electrical port, or a combination thereof, wherein the at least one port couples with a corresponding port of the BOP stack.

Abstract: An underwater vehicle is configured to transfer a payload between a first location and a second location at a subsea structure. The underwater vehicle includes a payload support configured to support the payload and a buoyancy control system. The buoyancy control system includes at least one of an exchange weight system configured to receive one or more exchange weights when delivering the payload, a floatation system having one or more floatation devices coupled to the payload, or a combination thereof.

Abstract: A blowout preventer (BOP) stack module includes a chassis core including a module frame, a remotely operated underwater vehicle (ROV) coupling hardware coupled to the chassis core, wherein the ROV coupling hardware couples with an ROV configured to transport and selectively couple and uncouple the BOP stack module relative to a BOP stack, a mechanical connector coupled to the chassis core, wherein the mechanical connector couples to a stack frame of the BOP stack, an electrical BOP component coupled to the chassis core, wherein the electrical BOP component performs one or more electrical BOP functions of the BOP stack, and an electrical connector coupled to the chassis core and the electrical BOP component, wherein the electrical couples to a corresponding electrical connector of the BOP stack or an adjacent BOP stack module.