exported
necessary
wellbore
IRI:
http://www.inf.ufrgs.br/ontologies/copi#Wellbore
Generated on 2026-04-14
Natural Language Definition
EN
A wellbore is a site that provides a drilled pathway for subsurface access and is spatially contained within a well system.
PT-BR
Um poço perfurado é um local que fornece um caminho perfurado para acesso subsuperficial e está espacialmente contido dentro de um sistema de poço.
Formal Axioms
Semi-formal (Aristotelian)
Every wellbore is a site that has the function of providing subsurface access and is spatially contained within a well.
First-Order Logic Theory
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▸ Stored override
∀x(Wellbore(x) ↔ Site(x) ∧ ∃f(SubsurfaceAccessFunction(f) ∧ hasFunction(x,f)) ∧ ∃w(Well(w) ∧ spatiallyContainedIn(x,w)))
OWL 2 / Turtle
@prefix copi: <https://www.inf.ufrgs.br/ontologies/copi/> .
@prefix : <https://www.inf.ufrgs.br/ontologies/copi/> .
@prefix owl: <http://www.w3.org/2002/07/owl#> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
@prefix bfo: <http://purl.obolibrary.org/obo/> .
@prefix iof-core: <https://spec.industrialontologies.org/ontology/construct/> .
@prefix iof-av: <https://spec.industrialontologies.org/ontology/annotation/> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
@prefix qudt: <http://qudt.org/schema/qudt/> .
@prefix dcterms: <http://purl.org/dc/terms/> .
@prefix foaf: <http://xmlns.com/foaf/0.1/> .
@prefix apv: <http://inf.ufrgs.br/ontologies/apv#> .
### COPI — Core Ontology for Petroleum Installations
### Class module: Wellbore
<https://www.inf.ufrgs.br/ontologies/copi>
rdf:type owl:Ontology ;
dcterms:title "Core Ontology for Petroleum Installations (COPI)"@en ;
dcterms:title "Ontologia Core para Instalações de Petróleo (COPI)"@pt-br ;
dcterms:description "BFO/IOF-Core conformant ontology of equipment classes for petroleum production plants, developed using the five-step RDL enrichment method."@en ;
skos:scopeNote "Material artifacts (bfo:material_entity) that (i) are part of a petroleum production plant, and (ii) bear at least one function whose realization involves the transport (e.g. production and injection), processing (separation and other processes), control, monitoring, measurement, containment or offloading of material or energy."@en ;
skos:scopeNote "Artefatos materiais (bfo:material_entity) que (i) fazem parte de uma planta de produção de petróleo, e (ii) possuem ao menos uma função cuja realização envolve o transporte (p. ex. produção e injeção), processamento (separação e outros processos), controle, monitoramento, medição, contenção ou escoamento de material ou energia."@pt-br ;
skos:scopeNote "COPI provides high-level equipment categories defined by function to demonstrate the defined-class mechanism. Equipment subtypes are annotated with references to CFIHOS and PCA RDL terms. COPI is not a reference data library; organizations should use CFIHOS, PCA RDL, or ISO 14224 for comprehensive equipment classification."@en ;
skos:scopeNote "COPI fornece categorias de alto nível de equipamentos definidas por função para demonstrar o mecanismo de classe definida. Os subtipos de equipamentos são anotados com referências aos termos do CFIHOS e do PCA RDL. COPI não é uma biblioteca de dados de referência; organizações devem utilizar o CFIHOS, o PCA RDL ou a ISO 14224 para classificação abrangente de equipamentos."@pt-br ;
owl:versionInfo "1.1.0" ;
owl:imports <https://spec.industrialontologies.org/ontology/core/Core/> ;
owl:imports <http://purl.obolibrary.org/obo/bfo/2020/bfo.owl> ;
dcterms:creator "Nicolau Oyhenard dos Santos"@en ;
dcterms:contributor "Cauã Antunes" ;
dcterms:contributor "Haroldo Rojas" ;
dcterms:contributor "Rafael Petry" ;
dcterms:contributor "Régis Romeu" ;
dcterms:contributor "Mara Abel" ;
dcterms:isPartOf <https://inf.ufrgs.br/projetos/OntoKG> ;
dcterms:publisher "Universidade Federal do Rio Grande do Sul (UFRGS)"@en ;
dcterms:license <https://creativecommons.org/licenses/by/4.0/> ;
dcterms:created "2026-04-08"^^xsd:date ;
dcterms:modified "2026-10-08"^^xsd:date ;
apv:GlobalMinLanguageCoverage "en pt-br" ;
apv:ClassURIFormationRule "https://www[.]inf[.]ufrgs[.]br/ontologies/copi/(COPI_[0-9]{7}|[A-Z][A-Za-z0-9]*)" ;
apv:ClassMinAnnotationCoverage "rdfs:label https://spec.industrialontologies.org/ontology/annotation/naturalLanguageDefinition" .
iof-av:naturalLanguageDefinition rdf:type owl:AnnotationProperty ;
apv:MinAnnotationLength 20 .
:COPI_0000654 # SubsurfaceAccessProcess
rdfs:subClassOf [
rdf:type owl:Restriction ;
owl:onProperty iof-core:hasInput ;
owl:someValuesFrom :COPI_0000391 # DrillingFluid
] ;
rdfs:subClassOf [
rdf:type owl:Restriction ;
owl:onProperty iof-core:hasInput ;
owl:someValuesFrom :COPI_0000480 # DrillString
] ;
rdfs:subClassOf [
rdf:type owl:Restriction ;
owl:onProperty iof-core:hasSpecifiedOutput ;
owl:someValuesFrom :COPI_0000399 # RockCuttings
] ;
rdfs:subClassOf [
rdf:type owl:Restriction ;
owl:onProperty iof-core:hasSpecifiedOutput ;
owl:someValuesFrom :COPI_0000376 # Wellbore
] .
:COPI_0000480 # DrillString
iof-av:naturalLanguageDefinition "An assembly of drill pipe, drill collars and downhole tools joined end to end that transmits rotation, weight and drilling fluid from the rig to the drill bit."@en ;
skos:definition "An assembly of drill pipe, drill collars and downhole tools joined end to end that transmits rotation, weight and drilling fluid from the rig to the drill bit."@en ;
iof-av:naturalLanguageDefinition "Um conjunto de tubos de perfuração, comandos e ferramentas de fundo unidos pelas extremidades que transmite rotação, peso e fluido de perfuração da sonda até a broca."@pt-br .
### Equipment universal: Wellbore
:COPI_0000376 rdf:type owl:Class ; # Wellbore
rdfs:subClassOf bfo:BFO_0000029 ;
rdfs:label "wellbore"@en ;
rdfs:label "poço perfurado"@pt-br ;
iof-av:naturalLanguageDefinition "A wellbore is a site that provides a drilled pathway for subsurface access and is spatially contained within a well system."@en ;
skos:definition "A wellbore is a site that provides a drilled pathway for subsurface access and is spatially contained within a well system."@en ;
iof-av:naturalLanguageDefinition "Um poço perfurado é um local que fornece um caminho perfurado para acesso subsuperficial e está espacialmente contido dentro de um sistema de poço."@pt-br ;
iof-av:semiFormalNaturalLanguageAxiom "Every wellbore is a site that has the function of providing subsurface access and is spatially contained within a well."@en ;
iof-av:firstOrderLogicAxiom "∀x(Wellbore(x) ↔ Site(x) ∧ ∃f(SubsurfaceAccessFunction(f) ∧ hasFunction(x,f)) ∧ ∃w(Well(w) ∧ spatiallyContainedIn(x,w)))"@en ;
iof-av:isPrimitive "true"^^xsd:boolean ;
dcterms:source <https://glossary.slb.com/en/terms/w/wellbore> ;
dcterms:source <https://onepetro.org/search-results?page=1&q=wellbore> ;
dcterms:source <https://ppdm.org/ppdm/PPDM/Standards/What_is_a_Well/PPDM/Standards/What_is_a_Well.aspx> .
Axiomatization Decision Log
1
Identity-Giving Function
Function class
SubsurfaceAccessFunction
⊑ DesignedFunction
Realized in
SubsurfaceAccessProcess
⊑ PlannedProcess
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.
2
Genus Determination
Site
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.
3
Necessary Parts
No necessary parts recorded (concept may be primitive at this level).
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.
4
Process Participation Signature ⟨I, O, T⟩
Inputs (I)
DrillingFluid
— circulation during drilling
DrillString
— drilling equipment passage
Outputs (O)
RockCuttings
— removed rock and fluid
Wellbore
— pathway to target formation
Transformation (T)
spatial creation - conversion of solid rock volume into accessible pathway
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.
5
Axiom Mode Decision
Necessary conditions only
— modelled as a primitive universal
(⊑, SubClassOf). Identity is grounded in designed
function and cannot be reduced to a property checklist.
Cross-Standard Observations
SLB and OnePetro provide simple definitions focusing on the drilled hole aspect, while PPDM provides more comprehensive definition including path concept and relationship to well system. All sources agree on the fundamental nature as a drilled hole/pathway.
