Subsurface safety valve including safe additive injection

摘要

A safety valve for an effluent-production installation, the safety valve comprising a longitudinal shell in which there extends a production tube defining an inside volume for effluent flow. The tube is movable in translation inside the shell in an axial direction between an advanced position in which effluent flow is authorized from the bottom of the installation towards the surface, and a retracted position in which effluent flow is prevented. The valve includes a connection duct between a feed line for feeding at least one additive from the surface and an injection line for injecting the additive downhole, a safety plug being provided in the connection duct in order to close or open the duct depending on whether the production tube is in its retracted position or its advanced position.

主权项

1. A safety valve for an effluent-production installation, the safety valve comprising:
a longitudinal shell in which there extends a production tube defining an inside volume for effluent flow, the production tube being movable in translation inside the longitudinal shell in an axial direction between an advanced position in which effluent flow is authorized from the bottom of the installation towards the surface, and a retracted position in which effluent flow is prevented; a connection duct between a feed line for feeding at least one additive from the surface and an injection line for injecting the additive downhole; and a safety plug being provided in the connection duct and being movable in translation along the axial direction in which the production tube moves in order to close or open the connection duct depending on whether the production tube is in its retracted position or its advanced position, the production tube being arranged to push the safety plug in said axial direction on passing from its retracted position towards its advanced position, the movement driving between the production tube and the safety plug being a mechanical connection by contact.