A safety valve for use with horizontal subsea trees as described which uses a two-part safety valve system. The first part containing a valve mechanism remains in the wellhead and is normally biased to a closed position. Safety Valves The valve mechanism remains in the wellhead at all times during production and can be actuated to an open position by latching in a second part which contains control cables and a moveable valve actuator operable from the surface during workover to actuate the valve in the wellhead portion open.Forged Steel Valves This provides for greater safety during the workover phase in comparison to a wire set plug and allows safer re-entry to the well. A horizontal tree safety valve comprising: a first safety valve portion containing valve means moveable between an open and a closed position, wherein said moveable valve means is located in the tree,FORGED STEEL VALVES a first resiliently biased means located in said first valve portion and coupled to said moveable valve means, said first resiliently biased means urging said moveable valve means to the closed position, a second safety valve portion releasably secured to said first valve portion by latch means, said latch means having first and second latching portions coupled to said respective first and second valve portions, said second valve portion having a resiliently biased element coupled to said moveable valve means when said first and second safety valve portions are secured together, said resiliently biased element responding to an actuating force applied thereto to urge said moveable valve means to the open position when said actuating force is present, said first resiliently biased means and said resiliently biased element urging said valve means to the closed position in the absence of said actuating force. It is an object of the present invention to provide an improved apparatus and method for providing well isolation and to mitigate or obviate at least one of the disadvantages associated with the existing apparatus and methods. This is achieved by using a two-part safety valve system. A first part containing a valve mechanism remains in the wellhead and is normally biased to a closed position. The valve remains in the wellhead at all times during production and can be actuated to an open position by latching in a second part which contains control cables and a moveable valve actuator operable from the surface during workover to actuate the valve in the wellhead portion open. This provides for greater safety during the workover phase in comparison to a wire set plug and also allows safer re-entry to the well.

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