Abstract: A subsea test tree assembly is provided which includes at least one subsea test tree or SSTT, the SSTT including a valve having at least one of a cutting function and a sealing function, the valve being movable between an open position and a closed position via hydraulic fluid supplied to the valve through control lines; and a control system including a source of hydraulic fluid, the control system being arranged to supply hydraulic fluid from the source of hydraulic fluid to the valve of the at least one SSTT on detecting that the control lines have been sheared, to automatically move the valve to the closed position. A method of controlling a well using an SSTT assembly is also provided.

Abstract: A subsea test tree assembly is provided which includes at least one subsea test tree or SSTT, the SSTT including a valve having at least one of a cutting function and a sealing function, the valve being movable between an open position and a closed position via hydraulic fluid supplied to the valve through control lines; and a control system including a source of hydraulic fluid, the control system being arranged to supply hydraulic fluid from the source of hydraulic fluid to the valve of the at least one SSTT on detecting that the control lines have been sheared, to automatically move the valve to the closed position. A method of controlling a well using an SSTT assembly is also provided.

Abstract: A landing string includes a valve having a valve member mounted within a flow path extending through the landing string, and a valve control system for use in operating the valve to move the valve member between open and closed positions to control flow along the flow path. The valve control system is reconfigurable between a first configuration in which the valve is operated or controlled under a fail-as-is (FAI) mode of operation, and a second configuration in which the valve is operated or controlled under a fail-close (FC) mode of operation.

Abstract: A landing string includes a valve having a valve member mounted within a flow path extending through the landing string, and a valve control system for use in operating the valve to move the valve member between open and closed positions to control flow along the flow path. The valve control system is reconfigurable between a first configuration in which the valve is operated or controlled under a fail-as-is (FAI) mode of operation, and a second configuration in which the valve is operated or controlled under a fail-close (FC) mode of operation.

Abstract: A system and method whereby an air charter brokerage service enables users with similar or matching travel plans to find each other to directly negotiate a shared flight itinerary using a web-based negotiation software application. The air charter brokerage service further enables users to directly book the shared itinerary using a web-based negotiation software application, whereby the air charter brokerage service provides a charter aircraft for the shared flight itinerary.

Abstract: A system and method whereby an air charter brokerage service enables users with similar or matching travel plans to find each other to directly negotiate a shared flight itinerary using a web-based negotiation software application. The air charter brokerage service further enables users to directly book the shared itinerary using a web-based negotiation software application, whereby the air charter brokerage service provides a charter aircraft for the shared flight itinerary.

Abstract: A system and method whereby an air charter brokerage service enables users with similar or matching travel plans to find each other to directly negotiate a shared flight itinerary using a web-based negotiation software application. The air charter brokerage service further enables users to directly book the shared itinerary using a web-based negotiation software application, whereby the air charter brokerage service provides a charter aircraft for the shared flight itinerary.