12.13.8 Trajectory

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

The trajectory object is used to capture information about a directional survey in a wellbore. It contains many trajectory stations to capture the information about individual survey points. This object is uniquely identified within the context of one wellbore object.

Table 12.13.8-1 Attributes

Name

Type

Notes

AziRef

AziRef

Specifies the definition of north.

While this is optional because of legacy data, it is strongly recommended

that this always be specified.

AziVertSect

PlaneAngleMeasure

Azimuth used for vertical section plot/computations.

Definitive

boolean

True ("true" or "1") indicates that this trajectory is definitive for

this wellbore. False ("false" or "0") or not given indicates otherwise.

There can only be one trajectory per wellbore with definitive=true and it

must define the geometry of the whole wellbore (surface to bottom).

The definitive trajectory may represent a composite of information in many

other trajectories. A query requesting a subset of the possible information can

provide a simplistic view of the geometry of the wellbore.

DispEwVertSectOrig

LengthMeasure

Origin east-west used for vertical section plot/computations.

DispNsVertSectOrig

LengthMeasure

Origin north-south used for vertical section plot/computations.

DTimTrajEnd

TimeStamp

End date and time of trajectory station measurements.

Note that this is NOT a server query parameter.

DTimTrajStart

TimeStamp

Start date and time of trajectory station measurements.

Note that this is NOT a server query parameter.

FinalTraj

boolean

Is trajectory a final or intermediate/preliminary?

Values are "true" (or "1") and "false" (or "0").

GridConUsed

PlaneAngleMeasure

Magnetic declination (convergence) used to correct a Magnetic North referenced azimuth to a True North azimuth. Magnetic declination angles are measured positive clockwise from True North to Magnetic North (or negative in the anti-clockwise direction). To convert a Magnetic azimuth to a True North azimuth, the magnetic declination should be added. Starting value if stations have individual values.

GrowingStatus

ChannelStatus

Describes the growing status of the trajectory, whether active, inactive or closed

MagDeclUsed

PlaneAngleMeasure

Magnetic declination used to correct a Magnetic North referenced azimuth

to a True North azimuth. Magnetic declination angles are measured positive clockwise

from True North to Magnetic North (or negative in the anti-clockwise direction).

To convert a Magnetic azimuth to a True North azimuth, the magnetic declination should be added.

Starting value if stations have individual values.

MdMn

MeasuredDepthCoord

Minimum measured depth of this object.

This is an API "structural-range" query parameter for growing objects.

See the relevant API specification for the query behavior related to this element.

MdMx

MeasuredDepthCoord

Maximum measured depth of this object.

This is an API "structural-range" query parameter for growing objects.

See the relevant API specification for the query behavior related to this element.

Memory

boolean

Is trajectory a result of a memory dump from a tool?

Values are "true" (or "1") and "false" (or "0").

ServiceCompany

String64

Name of contractor who provided the service.

Table 12.13.8-2 Associations

Association

Notes

From: Trajectory.

To: ChannelStatus

Dependency

 

From: Trajectory.Wellbore

1..1To: Wellbore

Association

 

From: Trajectory.ParentTrajectory

0..1To: Trajectory

Association

If a trajectory is tied into another trajectory,

a pointer to the parent trajectory.

The trajectory may be in another wellbore.

From: Trajectory.

To: AziRef

Dependency

 

From: Trajectory.

To: AbstractObject

Generalization

 

From: Trajectory.TrajectoryStation

0..*To: TrajectoryStation

Association

Container element for trajectory station elements.

This is an API "data-node" query parameter for growing objects.

See the relevant API specification for the query behavior related to this element.

From: Trajectory.ParentTrajectory

0..1To: Trajectory

Association

If a trajectory is tied into another trajectory,

a pointer to the parent trajectory.

The trajectory may be in another wellbore.

From: WellboreMarker.Trajectory

0..1To: Trajectory

Association

Reference to the directional survey used to convert the marker's MD to TVD.

Even though the field is optional, it should be thought of as mandatory for any marker with a TVD (because one would have been used to make the conversion). Because this information is often lost or the survey is unavailable in the context of a data transfer the field is left as optional.