EARLY SUBSEA PRODUCTION SYSTEM

Abstract

As a result of the high capital expenditure and construction time required for fixed platform type off-shore production, Vetco has investigated methods for early subsea production, utilising floating platforms. Several systems have been developed which offer flexibility when considering field size, geometry, water depth, etc.

The "Modular Template System" is applicable where up to eight wells are to be completed. The modular approach of this system offers the user a system which requires relatively low initial capital investment. The basic template structure accommodates only two wells and is, therefore, not significantly larger in size than a conventional drilling base.

The "Multi-Well (unitised) Template System" employs a one piece template structure which car. accommodate up to eleven wells. This substantial template requires only a first time installation and is recommended for use in situations where the total well requirement has been predetermined

As a third alternative, a "Satellite Well System" has been developed which has individual satellite wells located strategically throughout the field. Flowlines from these wells converge to a central riser manifold.

The Vetco "Early Subsea Production System" transports the production fluid from the template/riser manifold to the floating platform through an individual flowline riser system. The simplicity of this approach provides reliability as well as ultimate well control.

Several options have been developed to allow use of the "Early Subsea Production Systems" in those situations where gas injection, water injection, gas lift and/or TFL serviceability are required.

The Vetco "Early Subsea Production Systems" are solutions for the recovery of hydrocarbons from fields located in water depths which allow the use of standard guideline techniques.

With drilling operations being conducted in ever deeper waters, a separate design study has been conducted to adapt the "Early Subsea Production Systems" to deep water applications.