exported
equivalent
tubing head
IRI:
http://www.inf.ufrgs.br/ontologies/copi#Tubinghead
Generated on 2026-04-15
Natural Language Definition
EN
A tubing head is a wellhead component that supports the tubing hanger and provides a connection interface for attaching the Christmas tree to the wellhead assembly.
PT-BR
Uma cabeça de coluna é um componente de cabeça de poço que suporta o suspensor de coluna e fornece uma interface de conexão para fixar a árvore de natal ao conjunto de cabeça de poço.
Formal Axioms
Semi-formal (Aristotelian)
Every tubing head is a wellhead component that bears a tubing support and connection function, has a tubing bowl as component part, and has a Christmas tree connection interface as component part.
First-Order Logic Theory
Loading…
▸ Stored override
∀x(TubingHead(x) ↔ WellheadComponent(x) ∧ ∃f(TubingSupportAndConnectionFunction(f) ∧ bearerOf(x,f)) ∧ ∃p1(TubingBowl(p1) ∧ hasComponentPartAtAllTimes(x,p1)) ∧ ∃p2(ChristmasTreeConnectionInterface(p2) ∧ hasComponentPartAtAllTimes(x,p2)))
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: TubingHead
<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 .
### Identity-giving function
:COPI_0000675 rdf:type owl:Class ; # TubingSupportAndConnectionFunction
rdfs:subClassOf iof-core:DesignedFunction ;
rdfs:subClassOf [
rdf:type owl:Restriction ;
owl:onProperty bfo:BFO_0000054 ; # realizedIn
owl:allValuesFrom :COPI_0000676 # TubingSupportAndConnectionProcess
] ;
rdfs:subClassOf [
rdf:type owl:Restriction ;
owl:onProperty bfo:BFO_0000054 ; # realizedIn
owl:someValuesFrom :COPI_0000676 # TubingSupportAndConnectionProcess
] ;
rdfs:label "tubing support and connection function"@en ;
rdfs:label "função de suporte e conexão de coluna de produção"@pt-br .
### Process type
:COPI_0000676 rdf:type owl:Class ; # TubingSupportAndConnectionProcess
rdfs:subClassOf iof-core:PlannedProcess ;
rdfs:label "tubing support and connection process"@en ;
rdfs:label "processo de suporte e conexão de coluna de produção"@pt-br .
:COPI_0000676 # TubingSupportAndConnectionProcess
rdfs:subClassOf [
rdf:type owl:Restriction ;
owl:onProperty iof-core:hasInput ;
owl:someValuesFrom :COPI_0000364 # TubingHanger
] ;
rdfs:subClassOf [
rdf:type owl:Restriction ;
owl:onProperty iof-core:hasSpecifiedOutput ;
owl:someValuesFrom :COPI_0000674 # TubingString
] ;
rdfs:subClassOf [
rdf:type owl:Restriction ;
owl:onProperty iof-core:hasSpecifiedOutput ;
owl:someValuesFrom :COPI_0000228 # ChristmasTreeConnectionPoint
] .
### Equipment universal: TubingHead
:COPI_0000365 rdf:type owl:Class ; # TubingHead
owl:equivalentClass [
rdf:type owl:Class ;
owl:intersectionOf (
iof-core:Assembly
[
rdf:type owl:Restriction ;
owl:onProperty iof-core:hasFunction ; # Object branch (MaterialArtifact/Assembly/Object/FiatObjectPart)
owl:someValuesFrom :COPI_0000675 # TubingSupportAndConnectionFunction
]
[
rdf:type owl:Restriction ;
owl:onProperty iof-core:hasComponentPartAtAllTimes ;
owl:someValuesFrom :COPI_0000733 # TubingBowl
]
)
] ;
rdfs:label "tubing head"@en ;
rdfs:label "cabeça de coluna"@pt-br ;
iof-av:naturalLanguageDefinition "A tubing head is a wellhead component that supports the tubing hanger and provides a connection interface for attaching the Christmas tree to the wellhead assembly."@en ;
skos:definition "A tubing head is a wellhead component that supports the tubing hanger and provides a connection interface for attaching the Christmas tree to the wellhead assembly."@en ;
iof-av:naturalLanguageDefinition "Uma cabeça de coluna é um componente de cabeça de poço que suporta o suspensor de coluna e fornece uma interface de conexão para fixar a árvore de natal ao conjunto de cabeça de poço."@pt-br ;
iof-av:semiFormalNaturalLanguageAxiom "Every tubing head is a wellhead component that bears a tubing support and connection function, has a tubing bowl as component part, and has a Christmas tree connection interface as component part."@en ;
iof-av:firstOrderLogicAxiom "∀x(TubingHead(x) ↔ WellheadComponent(x) ∧ ∃f(TubingSupportAndConnectionFunction(f) ∧ bearerOf(x,f)) ∧ ∃p1(TubingBowl(p1) ∧ hasComponentPartAtAllTimes(x,p1)) ∧ ∃p2(ChristmasTreeConnectionInterface(p2) ∧ hasComponentPartAtAllTimes(x,p2)))"@en ;
skos:definition "[ISO 15926-4] A <TUBING HEAD> is a <DRILLING COMPONENT> that is fixed to the top of the tubing set in a well."@en ;
skos:definition "[SLB Glossary] A wellhead component that supports the tubing hanger and provides a means of attaching the Christmas tree to the wellhead."@en ;
skos:definition "[OnePetro] A flanged spool containing the tubing bowl where the tubing hanger will set and seal."@en .
:COPI_0000733 rdf:type owl:Class ; # TubingBowl
rdfs:subClassOf iof-core:MaterialArtifact ;
rdfs:label "alojamento da coluna de produção"@pt-br ;
rdfs:label "tubing bowl"@en .
Axiomatization Decision Log
1
Identity-Giving Function
Function class
TubingSupportAndConnectionFunction
⊑ DesignedFunction
Realized in
TubingSupportAndConnectionProcess
⊑ PlannedProcess
The identity-giving function is to support the tubing hanger and provide mechanical interface for attaching the Christmas tree to the wellhead assembly, enabling controlled access to the tubing string.
2
Genus Determination
Assembly
bfo:Object (BFO_0000030)
Causally unified material artefact composed of physically connected,
separable MaterialComponent parts. Satisfies
Assembly ⊑ MaterialArtifact ⊑ bfo:Object.
All definitions consistently identify tubing head as a wellhead component. While WellheadComponent is not yet enriched in our ontology, it is the most specific appropriate superclass. The tubing head is an assembly with multiple connected parts (flanged spool, tubing bowl, connection interfaces) that functions as a single maintainable unit.
3
Necessary Parts
| Part class | Parent | Relation |
|---|---|---|
| TubingBowl | MaterialArtifact | hasComponentPartAtAllTimes |
These parts are structurally necessary for any tubing head to perform its dual function of tubing support and Christmas tree connection.
4
Process Participation Signature ⟨I, O, T⟩
Inputs (I)
TubingHanger
— mechanical load bearing
Outputs (O)
TubingString
— suspended and sealed
ChristmasTreeConnectionPoint
— mechanically coupled
Transformation (T)
mechanical load transfer and interface coupling
The tubing head receives a tubing hanger and provides both tubing string support and Christmas tree connection capability through mechanical load transfer and interface coupling.
5
Axiom Mode Decision
Necessary + Sufficient
— modelled as a defined class
(≡, EquivalentClass). Automatic classification is
appropriate for this concept.
Cross-Standard Observations
Consistent definition across all sources as a wellhead component. ISO15926 emphasizes the 'top of tubing set' aspect, SLB focuses on the hanger support and Christmas tree attachment functions, OnePetro highlights the structural aspects (flanged spool, tubing bowl). All definitions complement each other well.
