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For a major project, a DBD should include the following
sections:
Development overview: describes the project location and
basic layout.
Reservoir and well information: provides reservoir
characteristics, fluid rheology and production rates.
Environmental: defines geotechnical properties along the
proposed route (shear strength, weight, etc.), meta-ocean data
(waves and currents), and seawater temperatures/chemistry .
Flow assurance: provides information on flowline
parameters, e.g. operating pressures, temperatures and velocities;
identify and address flow hazards such as hydrates, wax, scale,
corrosion, slugging.
Wellbore, drilling and completion information: provides
safety valve philosophy, downhole chemical injection, completion
design, downhole monitoring, general rig description, well
servicing and intervention process, etc.
Equipment design philosophy: describes the design and
selection approach, standardization of components and interfaces,
equipment design life, quality programme.
Subsea trees and flowline/pipeline sleds: describes subsea
trees, flowline/pipeline sled characteristics, tie-in jumpers,
completion/workover system, equipment marking, corrosion
protection.
Production control system and umbilicals: establishes
codes and standards, system overview, subsea instrumentation,
redundancy, emergency shut-down valve (ESV) requirements,
surface equipment, subsea equipment, power and hydraulic
umbilical, methanol distribution umbilical (if required), intelligent
well completions, metering.
Pipelines: provides general characteristics (grade, size,
water depth), route selection, applicable codes and regulation,
system design requirements (design life, cathodic protection
system, etc.), risers and tie-ins, maximum shut-in pressure,
corrosion allowance.
Host facilities: gives general description of the host,
process design, major equipment list, interface definitions.
Operation and maintenance: outlines normal production
parameters, start-up and shutdown procedures, routine testing
requirements, pigging, system maintenance, abandonment
philosophy.
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