Neqsim Production Network Routing

Production Network Routing

Use this skill for a quick, public screening of a "reservoir-to-facility" production network: wells flowing through manifolds and flowlines/risers to a host. Given wells with a productivity index and a manifold/flowline layout, it estimates a screening rate per well, aggregates rates by manifold, and rolls up an arrival pressure at the host with a simple pressure-drop gradient. It is intentionally simple and should guide users toward validated NeqSim inflow and multiphase-hydraulics workflows.

When to Use

• When wells, a manifold layout, and a required arrival pressure are available and a first network roll-up is needed.
• When an agent needs to chain reservoir-vs-time screening to a platform arrival-pressure check.
• Before detailed IPR, tubing, and multiphase flowline modelling.

Inputs

• wells: rows of {name, manifold, reservoir_pressure_bara, flowing_bottomhole_pressure_bara, productivity_index_sm3_per_day_bar, tubing_head_pressure_bara}.
• manifolds: rows of {name, flowline_length_km, pressure_gradient_bar_per_km, riser_dp_bar} (riser_dp_bar optional, default 0).
• host_name: name of the receiving host/platform (default HOST).
• required_arrival_pressure_bara: minimum required arrival pressure at the host.

Outputs

• wells: per-well drawdown_bar, rate_sm3_per_day, and flow_warning.
• manifolds: per-manifold total_rate_sm3_per_day, manifold_pressure_bara, flowline_dp_bar, riser_dp_bar, arrival_pressure_bara, arrival_margin_bar, and arrival_warning.
• total_rate_sm3_per_day: aggregated network rate.
• min_arrival_pressure_bara: lowest manifold arrival pressure.
• overall_warning: worst of the well and manifold warnings.
• neqsim_available: whether the optional NeqSim package is importable.
• assumptions: public assumptions and required follow-up.

A separate regulate_flow_from_inlet_pressure entry point screens pressure-regulated multiwell flow from a facility inlet/separator pressure and the reservoir pressures (see "Pressure-Regulated Multiwell / Manifold Flow").

Engineering Method

Each well rate is a linear productivity-index inflow: q = PI * max(0, P_res - P_bhp). A well with no drawdown flags high. Wells are grouped by manifold; the manifold collection pressure is the lowest routed well tubing-head pressure (the most-constrained well). The arrival pressure is the manifold pressure minus a screening flowline pressure drop (gradient * length) and an optional riser pressure drop. The arrival margin is the arrival pressure minus the required arrival pressure: negative is high, below 10 % of the requirement is watch, otherwise ok. The overall warning is the most severe across wells and manifolds.

This skill performs no real IPR, multiphase hydraulics, phase split, or thermal calculation. It applies simple algebra to supplied values and must be replaced by validated NeqSim tools for any quantitative use.

Python Usage Pattern

from production_network_routing import ProductionNetworkModel

wells = [
    {"name": "WELL-A", "manifold": "MANIFOLD-1", "reservoir_pressure_bara": 300.0,
     "flowing_bottomhole_pressure_bara": 250.0,
     "productivity_index_sm3_per_day_bar": 1.0e5, "tubing_head_pressure_bara": 140.0},
    {"name": "WELL-B", "manifold": "MANIFOLD-1", "reservoir_pressure_bara": 295.0,
     "flowing_bottomhole_pressure_bara": 240.0,
     "productivity_index_sm3_per_day_bar": 0.9e5, "tubing_head_pressure_bara": 135.0},
]
manifolds = [
    {"name": "MANIFOLD-1", "flowline_length_km": 8.0,
     "pressure_gradient_bar_per_km": 1.5, "riser_dp_bar": 20.0},
]

result = ProductionNetworkModel().evaluate(
    wells=wells, manifolds=manifolds, host_name="HOST",
    required_arrival_pressure_bara=90.0,
)
print(result.min_arrival_pressure_bara, result.overall_warning)

Pressure-Regulated Multiwell / Manifold Flow

In addition to the arrival-pressure roll-up above, this skill can screen the inverse problem: given a fixed facility inlet/separator pressure and each well's reservoir pressure, how much does each well flow? This generalizes the single-train NeqSim Adjuster pattern (which tunes one well rate to hit a target pipeline outlet pressure) to many wells and manifolds, mirroring NeqSim WellFlowlineNetwork.setTargetEndpointPressure.

regulate_flow_from_inlet_pressure(wells, target_inlet_pressure_bara, segment_dp_bar=None):

• Each well's flowing bottomhole pressure is the target inlet pressure plus a screening sum of segment pressure drops (well, choke, flowline, riser; default 60 + 10 + 5 + 8 = 83 bar). Override per call or per well via segment_dp_bar.
• Each well rate is a linear productivity-index inflow: q = PI * max(0, P_res - P_bhp). A well whose reservoir pressure cannot overcome the flowing bottomhole pressure flags high and produces zero rate.
• An optional per-well max_rate_sm3_per_day caps the rate and flags watch.

from production_network_routing import ProductionNetworkModel

wells = [
    {"name": "WELL-A", "manifold": "MANIFOLD-1", "reservoir_pressure_bara": 300.0,
     "productivity_index_sm3_per_day_bar": 1.0e5},
    {"name": "WELL-B", "manifold": "MANIFOLD-1", "reservoir_pressure_bara": 295.0,
     "productivity_index_sm3_per_day_bar": 0.9e5},
]

regulated = ProductionNetworkModel().regulate_flow_from_inlet_pressure(
    wells=wells, target_inlet_pressure_bara=140.0,
)
print(regulated.total_rate_sm3_per_day, regulated.flowing_well_count)
for w in regulated.wells:
    print(w.name, w.flowing_bottomhole_pressure_bara, w.rate_sm3_per_day, w.flow_warning)

Outputs: per-well flowing_bottomhole_pressure_bara, drawdown_bar, rate_sm3_per_day, and flow_warning; network total_rate_sm3_per_day, flowing_well_count, segment_dp_bar, overall_warning, neqsim_available, and assumptions.

Validated NeqSim Path

This screening is a placeholder. For real reservoir-to-facility behaviour use:

• NeqSim SimpleReservoir (runTransient) for reservoir-vs-time inflow.
• NeqSim PipeBeggsAndBrills for multiphase flowline/riser pressure drop and temperature with gas/oil/water.
• NeqSim MCP runPipeline, runProcess, and runFlowAssurance for arrival conditions and flow-assurance checks.
• The enterprise well-production-routing-agent for live-data, IPR + tubing, choke, and Beggs & Brills arrival modelling.

Escalation

Escalate any watch or high verdict, and any quantitative use, to validated NeqSim inflow and multiphase-hydraulics models and qualified production-technology review.

Validation Checklist

• Inputs are validated and within stated ranges.
• Examples use public data only.
• Screening assumptions are stated explicitly.
• Limitations are respected.
• Quantitative use is escalated to validated NeqSim models.

Common Mistakes

Limitations

• Educational screening only; not a validated design method.
• No confidential data or proprietary methods are included.
• Escalate any quantitative or design use to validated NeqSim workflows.

References

• NeqSim repository: https://github.com/equinor/neqsim
• NeqSim Skills Guide: https://github.com/equinor/neqsim/blob/master/docs/integration/skills_guide.md