Field Development Plan — North Platte
Summary
North Platte is represented by the subsequently sanctioned Sparta concept, with subsea wells feeding a semisubmersible host.
Historical source snapshot, not a current operating-status assertion or a sanctioned engineering design. Missing inputs are preserved as unknown.
Revision history
| Revision | Date | What changed and why |
|---|---|---|
| Initial | 2026-10-19 | Documented the reported development concept and evidence gaps to provide a field-level portfolio reference. |
| 1 | 2026-10-20 | Kept conflicting depths unknown, distinguished source quantities and snapshot dates, and removed decimal padding to avoid inconsistent interpretation. |
Engineering rationale
The partner announcement describes a standardized floating production design following earlier host designs, with all-electric compression. Subsea wells connect to the new host. The design rationale is reported from the announcement rather than established by a new optimization.
Field parameters
| Input | Value | Source and scope |
|---|---|---|
| Operator at source date | Shell | S1: Opening paragraph names Shell as the operating co-owner. |
| Reported development concept | semisub_fps | S1: Development-plan paragraph and Facts about Sparta box identify the semi-submersible FPU. |
| Host | Sparta semisubmersible floating production unit | S1: Development-plan paragraph names the Sparta platform. |
| Water depth (m) | Unknown | S1: Partner fact box gives approximately 1,310 m; the lifecycle record gives 4,265 ft. These depths remain unresolved, so the portfolio depth stays null rather than choosing one source precision or location. |
| Wells (scope stated below) | 8 | S1: Development plan and fact box state eight production/subsea wells. |
| Designed peak capacity (boe/d) | 100000 | S1: Partner announcement gives 100,000 boe/d designed peak capacity. The lifecycle prose instead states approximately 90,000 boe/d expected peak, whose basis is not established by this announcement. The separate oil plateau is a legacy model input, not a conversion of designed capacity. Economics is not run. |
| Reported oil capacity (bbl/d; not a boe/d plateau) | Unknown | Required input; not established by the cited evidence. |
| Recoverable resources (MMboe) | Unknown | Required input; not established by the cited evidence. |
| Actual first-oil year | Unknown | Required input; not established by the cited evidence. |
Architecture
The reported development has eight subsea production wells tied back to the Sparta semisubmersible. Well positions, manifold counts and tieback lengths are not supplied.
Well coordinates, manifold counts and interconnection lengths are required inputs for a detailed layout. Layout: NOT_EVALUATED; no assumed geometry is drawn.
Recommended concept shortlist
NOT_EVALUATED. The reported concept is documented above; a comparative ranking requires sourced screening limits and criteria weights.
Economics and execution
NOT_EVALUATED. No cost or investment return is inferred from facility capacity. Required inputs include scope-matched capital cost, operating cost, production profile, prices, discount rate and schedule. Equipment qualification and installation feasibility also require project-specific design evidence.
Known limits and way forward
The source is a sanction-date snapshot and its startup date is a forecast. Capacity is a design target, not observed production. Resources are reported as exceeding a value, so no exact reserve number is entered. Obtain detailed layout and current scope before quantitative assessment. The published metric depth conflicts with the lifecycle depth, so the concept depth remains unknown. Designed capacity is distinct from the legacy expected-peak statement; its basis requires a separately dated source.
Sources
Input citations refer to the source dates below. Capacity, planned well count and forecast startup are not measured production.
- Final Investment Decision for Sparta in the US Gulf of Mexico (2023-12-20; primary partner announcement). Retrieved 2026-10-20T06:51:01.114036+00:00; HTTP 200; SHA-256: 08e45728677a8dfa1cf7eecfd605e5705d6b71d28ca502774e303661666a6ff4.