| abstract |
A downhole valve (1) has a housing (10) with a longitudinal main passage (11) and at least one valve port (13a, 13b) extending from the main passage (11) and through the housing (10), a valve member (12) arranged in the main passage (11), the valve member (12) arranged to cover the at least one port (13a, 13b), wherein at least a part of the valve member (12) is made of a degradable material which is reactive to water or a well fluid, and has a surface coating of a material which is non-reactive to water or the well fluid. |