Subsea Production Manifolds & Templates

[Lucas]

Subsea production manifolds and subsea templates have distinctly different functions, very often the functions of the two are combined into one unit (a subsea template), leading to confusion in the terminology.

Subsea production manifold is never a subsea template, a subsea template can be, and often is, also a subsea production manifold.

[Lucas]

***MAJOR FUNCTIONS OF SUBSEA PRODUCTION MANIFOLDS***

Collection of flow from individual satellite wells into a production header and control the delivery of the commingled flow to a field production gathering flowline.

Gathering the flow from several field production gathering flowlines and deliver that flow to a larger production export pipeline.

Isolation of the production from individual wells and deliver it to a well test header or a well test flowline.

Segregation of high pressure and low pressure production into separate high pressure and low pressure headers and flowlines.

Controling flow from individual wells by means of subsea chokes. Wells may be choked at the trees or at the manifold.

Distribution of injection water or gas from a common supply header to individual injection wells (water injection or gas injection manifolds).

Distribution of lift gas from a common lift gas header to individual wells (lift gas manifold).

Facilitate pigging of subsea pipelines by provision of pig isolation valves, tees and pig detector instrumentation mounted on the manifold structure.

[Lucas]

Clustered Manifold system allows the connection of flowlines from adjacent satellite wells and numerous in field flowlines consisting of export, service, and methanol lines.

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