| |
EnSys
Yocum Services

EnSys Yocum
delivers services
and software for oil and gas field development, production, separation and
transmission facilities simulation and design and for multiphase flow
measurement including our "virtual metering" systems.
Oil
and Gas Field Development Studies

EnSys Yocum and its affiliate Yocum Consultants design and
evaluate alternative field production
facilities development schemes (wells through
surface/gathering, separation, measurement and transmission
facilities) and optimize designs for best life of field
performance consistent with reservoir/fluid properties data
and projections.
Some examples of our work include:
- For a major North Sea field, a technically feasible
three-phase subsea production system with 46 wells
connected to a 450' riser to the process platform was
designed and simulated over the life of the field, then
compared with a multiphase study based on installing a
well platform with the wells connected to the
separator/process platform by a 450' downcomer into a
trunkline flowing into the 450' riser. A detailed analysis
of costs, risks and future problems was made. The
alternative system designs were simulated over a 10-year
period with high accuracies obtained on the wells through
the risers etc.
- For Alaska Prudhoe Bay, we ran simulations of the
performance of 12" and 16" three-phase
trunklines gathering flows from multi-well clusters and
supplying the gas/oil separator flow station. An overall
plan and detailed design layouts of the flow elements and
facilities were prepared and formed the basis for project
recommendations. The maximum flow capacities of the system
trunklines and gas/oil separator trains were determined.
Simulations were carried out based on reservoir
predictions of flowing bottom hole pressures and fluid
properties each year for 10 years.
- For SUCO Egypt, we simulated the gas lifting of the Ras
Budran wells and determined the depth of injection points,
location of gas lift valves and gas injection rates. We
calculated compressor horsepower requirements to produce
the optimum oil producing rates. We designed facilities
modifications to balance the total system and simulated
the application of downhole submergible pumping Ras Fanar
wells.
Production
Facilities Design/Performance

EnSys Yocum undertakes focused simulation studies of existing or
new production systems to identify and remove bottlenecks,
raise throughput and optimize separation efficiencies.
Some example of our work include:
- For Unocal (offshore Indonesia), we simulated offshore
two-phase and onshore multistage, 2/3-phase separators to
assess capacity constraints and the potential for raising
production, including by enabling produced water to be
discharged offshore rather than transmitted ashore. Our
simulations of water-in-oil and oil-in-water on
three-phase separations closely matched actuals. Our
results confirmed the severe under-sizing of the offshore
separator. Design options were presented to debottleneck
this and enable production to be raised by 30,000 bpd.
- For Preussag, Venezuela, we modeled and designed a
multiphase trunkline system with feeder lines along the
path for an existing field with low wellhead pressures. We
optimized flowlines versus pump and compressor stations.
The final design achieved several million dollars in
capital and projected operating cost savings versus
client's initial concept.
- For Caltex, Indonesia, we analyzed horizontal and
vertical separator design options for heavy oil, high
water cut, high viscosity emulsion. Our studies prevented
the development of severely undersized separators and led
the client to adopt novel design concepts saving millions
of dollars versus the correctly sized conventional
separators we designed.
Multiphase
Flow Measurement and Reconciliation

EnSys Yocum provides software and support services to enhance the
performance of multiphase and wet gas meters, reconcile mass
balances and flows versus multiphase and single-phase meters.
We also supply "virtual metering" technology for
complete flow measurement and reconciliation across a
producing system.
Some examples of our work include:
- For Texaco North Sea Erskine field, (HPHT with
retrograde condensation), we implemented our PVT Meter
software to correct flowrates from the six Erskine Framo
multiphase meters. PVT Meter software was installed
offline and integrated within the shore-based production
workstation, correcting flows on a daily basis.
- For Roxar ARCO Alaska, we integrated our PVT Meter
software into Roxar (MFI) multiphase meters for real time
application in two multiphase meters with partial
separation configuration. SPE paper 54605,
"Multiphase-Flow Measurement System of High-GOR
Applications," discusses this application, which
achieved high accuracies
|