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摘要

A submergible template structure is completely equipped with manifolding for handling well production fluids, gas injection and well maintenance with through-the-flowline (TFL) pumpdown tools. The template is designed to contain a number of clustered wells and is provided with a pollution control system, electro-hydraulic power source and an unmanned manipulator unit capable of traveling on a track arranged on the template for specific maintenance work on valves, control pods, pipe sections, etc. The template is furnished power and control through an electrical cable laid to a remote surface power source. Pipelines connect the template manifolding to remote gathering terminals. The template structure and the manifolding are disconnectable and reconnectable in sections for removal, repair and replacement of damaged sections. The template structure is completely equipped at the surface and then lowered to the sea floor using lines and controlled buoyancy. Once on bottom, the template is leveled and piles driven to anchor it. Wells are drilled from floating rigs and the wellheads are grouped together on the template. Christmas trees are lowered and connected to the wellheads and to the manifolding. Basic well maintenance is performed with TFL equipment although the wells may be re-entered vertically from a floating rig when necessary. All valves are hydraulic fail-safe and manual valves in the manifold are operable by the manipulator unit. The manipulator is lowered to the track and positioned where desired when performing operation of the valves or basic maintenance on the valves and manifold.