12.6.3 Channel

Topic Version1Published11/11/2016
For StandardWITSML v2.0
Type:ClassStereotype:«XSDcomplexType»

A channel object. It corresponds roughly to the LogCurveInfo structure in WITSML1411, and directly corresponds to the ChannelMetadataRecord structure in ETP. In historian terminology, a channel corresponds directly to a tag.

Channels are the fundamental unit of organization for WITSML logs.

Table 12.6.3-1 Attributes

Name

Type

Notes

DataType

EtpDataType

The underlying ETP data type of the value.

GrowingStatus

ChannelStatus

The status of a channel with respect to creating new measurements. Statuses include:

Active: A channel is actively producing data points.

Inactive: A channel is offline or not currently producing, but may begin producing again in the future.

Closed: A channel will never produce points again. The rules for when a channel is to be closed will vary some for different kinds of channels. For example, time-based surface channels may remain open for the entire life of the drilling operation, whereas depth-based wireline channels are closed at the end of the wireline job

Mnemonic

String64

The mnemonic name for this channel. Mnemonics are not unique within a store.

Source

String64

Source of the data in the channel. Enter the contractor name who conducted the log.

Uom

UnitOfMeasureExt

The underlying unit of measure of the value.

Table 12.6.3-2 Associations

Association

Notes

From: Channel.PointMetadata

0..*To: PointMetadata

Association

 

From: Channel.

To: AbstractObject

Generalization

 

From: Channel.

0..1To: Wellbore

Association

 

From: Channel.

To: ChannelStatus

Dependency

 

From: Channel.DerivedFrom

0..*To: Channel

Association

For derived channels, a list of the source channels which went into the derivation. For example, if you create a composite GR channel from several separate measured channels, this would point to those channels.

Note, that these references are for provenance only. The derived data must be store independently on the server for a derived channel.

From: Channel.LogChannelMetadata

1To: LogChannelMetadata

Association

 

From: Channel.Parent

0..1To: AbstractObject

Association

The containing data object for the channel set. For example, for a Log, this could be either the wellbore for the log or a LoggingRun

From: Channel.Index

1..*To: ChannelIndex

Association

 

From: Channel.AxisDefinition

0..*To: LogChannelAxis

Association

Indicates that the curve is an array curve (i.e., multi-valued samples), and provides meta data by which an axis of the array can be understood.

From: Channel.

To: EtpDataType

Dependency

 

From: Chromatograph.Channel

0..1To: Channel

Association

 

From: ChannelSet.Channel

1..*To: Channel

Association

 

From: GasPeak.Channel

1To: Channel

Association

 

From: Channel.DerivedFrom

0..*To: Channel

Association

For derived channels, a list of the source channels which went into the derivation. For example, if you create a composite GR channel from several separate measured channels, this would point to those channels.

Note, that these references are for provenance only. The derived data must be store independently on the server for a derived channel.

From: GasInMud.Channel

1To: Channel

Association