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umbilical and discrete fowline. The

Traditional platform versus higher cost of multiple fowlines and shallow water subsea system a control umbilical can be offset by

Platform Subsea the cost savings of a direct hydraulic

Option Option

Subsea control system over a multiplex control

Item (US$000,000) (US$000,000) system, as well as the elimination of

Drilling 67.5 67.5 the subsea control module and the

Wellhead Platform 60.0 subsea choke. The number of wells,

Subsea Trees, Control System, Control Umbilical 18.1 offset distance, and fowline diameters ultimately determine if this approach

Flowline 81.1 81.1 is cost effective.

OPEX 12.3 13.4

Workover 11.3 11.3

NPV comparison

We can use a very typical three-well

Total CAPEX 208.6 166.7 brownfeld development to demon-

Total OPEX & Workover 23.6 24.7 strate the NPV improvement that can

NPV 54.0 119.0 be realized by using shallow water sub-

Table compares CAPEX, OPEX, and NPV values for a conventional tripod platform and sea production systems. The shallow a shallow water subsea system.

water feld development team at FMC with nut-tensioning equipment at option for a subsea production system. Technologies was asked to evaluate great cost savings. Before selecting the Sometimes it is advantageous to apply and recommend the most economi- optimum approach, the total installed this principle to multi-well develop- cally attractive method of producing a cost, availability of divers in the region ments. One seabed architecture that set of wells. The client had previously of the installation, and client safety has been used several times to simplify installed tripod wellhead platforms requirements must be considered for operations and reduce CAPEX is one in a similar water depth in another each project. in which the trees are placed on a district and wanted to determine if a

A single well tie-back using direct template, then each tree is connected shallow water subsea approach would hydraulic controls is the lowest cost to the host facility with a discrete be economically attractive in this

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