Valve for a hydrocarbon well, hydrocarbon well provided with such valve and use of such valve

摘要

The invention relates to a safety valve (17) for a hydrocarbon wellbore. The valve comprises: a valve housing (100); a tubular valve member (102, 104) having an axially extending tube wall; and an operating mechanism (105) for operating the valve member. The housing is provided with a passage (101, 103) extending from a lower opening to an upper opening. The tube wall is provided with one or more radial inlet apertures (108, 109) through said tube wall. The lower end part of the tube wall is closed. The valve member is axially movable in the passage with respect to the housing between a flow position and a blocking position. In blocking position, the valve member is retracted in the housing such that the inlet apertures lie inside the housing and fluid flow between the lower opening and upper opening is prevented by the closed lower end part (111) of the valve member. In the flow position, the valve member projects below the housing such that the one or more radial inlet apertures lie outside the housing. The invention further relates to a tree (16) with such valve assembly, a retrofit assembly with such valve assembly, subsurface use of such valve assembly, a hydrocarbon well with such assembly and a method of retro-fitting a production flow safety valve with such valve assembly.