Generated by the worldenergydata field-development playbook (epic #567). Recommendation is heuristic (Concept Select / FEL-1 fidelity), not a sanctioned design.
Cheyenne is a stranded deepwater gas accumulation in ~2,748 m of water in Lloyd Ridge 399, far from existing infrastructure, so it was developed as a long-distance subsea tieback to Anadarko's Independence Hub semisubmersible rather than as its own facility (the semisub is the HOST, not the field's concept). Cheyenne's ~72 km tieback was among the longest gas tiebacks in the Gulf, demanding aggressive flow assurance (hydrate and liquids management with methanol/MEG and lean-gas operating philosophy) to keep single-phase-dominated gas moving over that distance. As a dry-gas subsea development, wet trees feeding a shared 1 Bcf/d processing semi was far cheaper than a dedicated host for a depleting gas reservoir. Independence Hub exhausted its anchor fields and ceased production around 2015, with wells permanently abandoned. Notable: Among the longest deepwater gas subsea tiebacks in the Gulf of Mexico (~45 miles to Independence Hub).
| Concept | Score | Trees | Rationale / flags |
|---|---|---|---|
| subsea_tieback ★ | 0.807 | wet | — tieback not clearly attractive (distance/capacity/size) |
| subsea_to_shore | 0.734 | wet | — |
| fpso | 0.688 | wet | — hurricane regime: FPSO needs a disconnectable turret |
| flng | 0.622 | wet | — |
★ = the concept actually selected for this field (where known).
Sources: SubseaIQ field catalog (~2014) + BSEE + curated vessel/ subsea catalogs. Schematics are deterministic, generated from the field concept.