Why do we use a subsea test tree assembly (SSTTA) during well test clean-up operations? To create a dual barrier in-riser subsea safety system required to control the hazards associated with bringing live hydrocarbons to the surface and providing the capability to disconnect/reconnect the well. The subsea test tree is positioned inside the rig’s blowout preventer (BOP) and spaced out so that, if needed, the BOP shear rams can be activated across the SSTTA shear sub. | Expro
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