Definition & axiom
⚠ Conflicts with the ISO 15926-4 primary definition
Label (EN)
wellbore
Label (PT-BR)
Definition (EN)
Definition (PT-BR)
Semi-formal axiom (Aristotelian)
Axiom type
LLM classification basis: function-based → ≡
A wellbore is primarily defined by its function as a path or channel for accessing subsurface resources, not by a specific physical construction method. The PPDM definition emphasizes it as 'a path of drilled footage' with a functional purpose, regardless of the drilling technique or physical configuration used to create it.
Validation status
Why primitive (necessary only)
Reviewer notes
FOL theory & disjointness
First-order logic theory (generated)
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Disjoint with
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Expert review
Axiomatization steps
1
Identity-Giving Function
✓ done
⚠ not anchored
SubsurfaceAccessFunction → SubsurfaceAccessProcess
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COPI-Core operation
⚠ Process parent
PlannedProcess reaches no COPI-Core operation, and no gap (out of scope / coverage gap) is recorded.
LLM rationale:
A wellbore's identity is grounded in providing a designed path for accessing subsurface resources. This is distinct from the broader SubsurfaceResourceInteractionFunction of a well - the wellbore specifically provides the access pathway, while the well system performs the interaction/extraction/injection operations.
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Expert review
2
Genus Proximus
✓ done
Site
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Genus (genus proximum)
Most specific superclass — may be a domain class like "Valve" or an IOF-Core root.
BFO/IOF-Core Root
bfo:Object branch
bfo:ObjectAggregate branch
bfo:ImmaterialEntity branch
LLM rationale:
A wellbore is fundamentally a spatial region - a drilled hole or cavity with engineered boundaries. It is not a material artifact but rather an immaterial entity (a hole/cavity/channel) defined by its spatial extent and engineered boundaries. This aligns with BFO Site (BFO_0000029) as a spatial region defined by boundaries. While 'Well' appears as a parent candidate, the wellbore is a spatial component of the well system, not a material object itself.
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Expert review
3
Differentia Specifica
✓ done
∃bearerOf.SubsurfaceAccessFunction ⊓ ∃spatiallyContainedIn.Well
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Conditions that distinguish
Wellbore
from sibling classes under genus
Site.
Only what is not already entailed by the genus.
Differentia expression
Differentia (natural language)
LLM rationale:
The differentia combines the functional aspect (subsurface access) with the spatial relationship (contained within a well system). This distinguishes wellbore from other engineered spatial regions and establishes its role within the well system.
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Expert review
4
Necessary Parts
✓ done
no necessary parts
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Consider part-whole relations beyond subsumption:
hasComponentPartAtAllTimes (universal, structurally essential)
· hasComponentPartAtSomeTime (contingent, optional component)
LLM rationale:
As a Site (spatial region/hole), a wellbore does not have material component parts. The hole itself is defined by its boundaries and spatial extent, not by constituent material objects. Equipment and structures may be installed within the wellbore, but they are not component parts of the spatial region itself.
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Expert review
5
Process Participation Signature ⟨I, O, T⟩
✓ done
⚠ 1 not in vocab
DrillingFluid + DrillString → RockCuttings + Wellbore
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⚠ Participant type(s) not in COPI vocabulary
DrillString(already published — grandfathered)
Participant types are hand-authored in
copi-vocab, not produced by the pipeline.
Replace each with an existing vocab type, redirect it to a BFO / IOF-Core class in copi-iri-map.tsv,
or add it to copi-vocab.ttl first.
Inputs (I)
Outputs (O)
Transformation (T)
LLM rationale:
The wellbore enables transformation of inaccessible subsurface volume into an accessible pathway, with drilling fluids and equipment as inputs and cuttings removal plus access provision as outputs.
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Expert review
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Alternative labels
none
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Synonyms / alternative labels (comma-separated) — skos:altLabel
Language auto-detected on export (PT if the label contains accents, EN otherwise).
Properties as BFO qualities
no CFIHOS/DEXPI properties
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No CFIHOS/DEXPI properties found for this cluster.
Custom axioms
none
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Axioms not produced by the pipeline. Each is appended verbatim as an
rdfs:subClassOf restriction on Wellbore.
Write the restriction block in Turtle syntax (without the leading
rdfs:subClassOf).
Example: [ owl:onProperty :hasPart ; owl:someValuesFrom :Wellhead ]
Cross-standard divergences
none detected yet
▼
Click "Detect divergences" to analyse cross-standard disagreements for this cluster.
