exported
equivalent
bell nipple
IRI:
http://www.inf.ufrgs.br/ontologies/copi#Bellnipple
Generated on 2026-04-15
Natural Language Definition
EN
A bell nipple is a pipe that conducts drilling fluids in drilling operations and is characterized by an enlarged diameter that serves as a funnel and a location at the wellhead assembly.
PT-BR
Um bell nipple é um tubo que conduz fluidos de perfuração em operações de perfuração e é caracterizado por um diâmetro alargado que serve como funil e uma localização no conjunto da cabeça do poço.
Formal Axioms
Semi-formal (Aristotelian)
Every bell nipple is a pipe that bears a DrillingFluidConductionFunction and has a side outlet as a component part at all times.
First-Order Logic Theory
Loading…
▸ Stored override
∀x(BellNipple(x) ↔ (Pipe(x) ∧ ∃f(DrillingFluidConductionFunction(f) ∧ bearerOf(x,f)) ∧ ∃p(SideOutlet(p) ∧ hasComponentPartAtAllTimes(x,p))))
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: BellNipple
<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_0000481 rdf:type owl:Class ; # DrillingFluidConductionFunction
rdfs:subClassOf iof-core:DesignedFunction ;
rdfs:subClassOf [
rdf:type owl:Restriction ;
owl:onProperty bfo:BFO_0000054 ; # realizedIn
owl:allValuesFrom :COPI_0000482 # DrillingFluidConductionProcess
] ;
rdfs:subClassOf [
rdf:type owl:Restriction ;
owl:onProperty bfo:BFO_0000054 ; # realizedIn
owl:someValuesFrom :COPI_0000482 # DrillingFluidConductionProcess
] ;
rdfs:label "drilling fluid conduction function"@en ;
rdfs:label "função de condução de fluido de perfuração"@pt-br .
### Process type
:COPI_0000482 rdf:type owl:Class ; # DrillingFluidConductionProcess
rdfs:subClassOf iof-core:PlannedProcess ;
rdfs:label "drilling fluid conduction process"@en ;
rdfs:label "processo de condução de fluido de perfuração"@pt-br .
:COPI_0000482 # DrillingFluidConductionProcess
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_0000483 # DrillingTool
] ;
rdfs:subClassOf [
rdf:type owl:Restriction ;
owl:onProperty iof-core:hasSpecifiedOutput ;
owl:someValuesFrom :COPI_0000391 # DrillingFluid
] ;
rdfs:subClassOf [
rdf:type owl:Restriction ;
owl:onProperty iof-core:hasSpecifiedOutput ;
owl:someValuesFrom :COPI_0000483 # DrillingTool
] .
### Equipment universal: BellNipple
:COPI_0000216 rdf:type owl:Class ; # BellNipple
owl:equivalentClass [
rdf:type owl:Class ;
owl:intersectionOf (
:COPI_0000321 # Pipe
[
rdf:type owl:Restriction ;
owl:onProperty iof-core:hasFunction ; # Object branch (MaterialArtifact/Assembly/Object/FiatObjectPart)
owl:someValuesFrom :COPI_0000481 # DrillingFluidConductionFunction
]
[
rdf:type owl:Restriction ;
owl:onProperty iof-core:hasComponentPartAtAllTimes ;
owl:someValuesFrom :COPI_0000639 # SideOutlet
]
)
] ;
rdfs:label "bell nipple"@en ;
rdfs:label "bell nipple"@pt-br ;
iof-av:naturalLanguageDefinition "A bell nipple is a pipe that conducts drilling fluids in drilling operations and is characterized by an enlarged diameter that serves as a funnel and a location at the wellhead assembly."@en ;
skos:definition "A bell nipple is a pipe that conducts drilling fluids in drilling operations and is characterized by an enlarged diameter that serves as a funnel and a location at the wellhead assembly."@en ;
iof-av:naturalLanguageDefinition "Um bell nipple é um tubo que conduz fluidos de perfuração em operações de perfuração e é caracterizado por um diâmetro alargado que serve como funil e uma localização no conjunto da cabeça do poço."@pt-br ;
iof-av:semiFormalNaturalLanguageAxiom "Every bell nipple is a pipe that bears a DrillingFluidConductionFunction and has a side outlet as a component part at all times."@en ;
iof-av:firstOrderLogicAxiom "∀x(BellNipple(x) ↔ (Pipe(x) ∧ ∃f(DrillingFluidConductionFunction(f) ∧ bearerOf(x,f)) ∧ ∃p(SideOutlet(p) ∧ hasComponentPartAtAllTimes(x,p))))"@en ;
skos:definition "[ISO 15926-4] A <BELL NIPPLE> is an <ARTEFACT> and a large diameter <PIPING NETWORK SEGMENT> fitted to the top of the blowout preventers that the flow line attaches to via a side outlet, to allow the drilling fluid to flow back over the shale shakers to the mud tanks. Also an enlarged pipe at the top of a casing string that serves as a funnel to guide drilling tools into the top of a well"@en ;
skos:definition "[CFIHOS] A Bell nipple is a section of large diameter pipe fitted to the top of the blowout preventers that the flow line attaches to via a side outlet, to allow the drilling fluid to flow back over the shale shakers to the mud tanks. Also an enlarged pipe at the top of a casing string that serves as a funnel to guide drilling tools into the top of a well."@en ;
skos:definition "[SLB Glossary] An enlarged pipe at the top of a casing string that serves as a funnel to guide drilling tools into the top of a well."@en ;
skos:definition "[OnePetro] A funnel shaped pipe at the top of the casing that guides tool string entry and may have a side port for fluid pumping."@en .
:COPI_0000639 rdf:type owl:Class ; # SideOutlet
rdfs:subClassOf iof-core:MaterialArtifact ;
rdfs:label "saída lateral"@pt-br ;
rdfs:label "side outlet"@en .
# Disjointness: BellNipple and HeatExchanger
[] rdf:type owl:AllDisjointClasses ;
owl:members ( :COPI_0000216 :COPI_0000092 ) . # BellNipple, HeatExchanger
# Disjointness: BellNipple and Separator
[] rdf:type owl:AllDisjointClasses ;
owl:members ( :COPI_0000216 :COPI_0000084 ) . # BellNipple, Separator
# Disjointness: BellNipple and Compressor
[] rdf:type owl:AllDisjointClasses ;
owl:members ( :COPI_0000216 :COPI_0000073 ) . # BellNipple, Compressor
Axiomatization Decision Log
1
Identity-Giving Function
Function class
DrillingFluidConductionFunction
⊑ DesignedFunction
Realized in
DrillingFluidConductionProcess
⊑ PlannedProcess
The identity-giving function is to conduct drilling fluid in drilling operations, specifically directing return flow from the wellbore to processing equipment and providing a conduit for tool entry. This is distinct from general FluidConductionFunction as it is specialized for drilling operations context.
2
Genus Determination
Pipe
Bell nipple is consistently described as a 'pipe' or 'section of pipe' across all sources. The parent candidates include PIPING NETWORK SEGMENT from ISO 15926, which aligns with the pipe genus. The enriched pipe class with FluidConductionFunction is the most specific appropriate superclass, as bell nipple is specialized piping for drilling operations.
3
Necessary Parts
| Part class | Parent | Relation |
|---|---|---|
| SideOutlet | MaterialArtifact | hasComponentPartAtAllTimes |
These parts are universally necessary for bell nipple function - the enlarged bore provides the funnel capability for tool guidance, while the side outlet enables drilling fluid return flow attachment.
4
Process Participation Signature ⟨I, O, T⟩
Inputs (I)
DrillingFluid
— returning from wellbore
DrillingTool
— entering wellbore
Outputs (O)
DrillingFluid
— directed to flow line
DrillingTool
— guided into wellbore
Transformation (T)
spatial guidance and flow direction - no material transformation
Bell nipple serves dual function: conducting drilling fluid return flow and providing guidance for drilling tools entering the wellbore. It performs spatial routing without material transformation.
5
Axiom Mode Decision
Necessary + Sufficient
— modelled as a defined class
(≡, EquivalentClass). Automatic classification is
appropriate for this concept.
Disjointness Axioms
heat exchanger
separator
compressor
C4: heat exchanger, separator, compressor. Bell nipple has a pure conduction/guidance signature with no energy transfer, phase separation, or compression, making it incompatible with equipment that performs material or energy transformations.
Cross-Standard Observations
Definitions are highly consistent across sources, with all mentioning the enlarged/funnel shape and wellhead location. ISO 15926 and CFIHOS provide more comprehensive descriptions including the side outlet detail, while SLB and OnePetro focus on the tool guidance aspect. No significant conflicts identified.
