12.13.8 Trajectory

Topic Version	1	Published	11/11/2016	Topic Change History
For Standard	WITSML v2.0
Type:	Class		Stereotype:	«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	The angle used to correct a true north referenced azimuth to a grid north azimuth. WITSML follows the Gauss-Bomford convention in which convergence angles are measured positive clockwise from true north to grid north (or negative in the anti-clockwise direction). To convert a true north referenced azimuth to a grid north azimuth, the convergence angle must be subtracted from true north. If StnGridConUsed is not provided, then this value applies to all grid-north referenced stations.
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.