12.13.9 TrajectoryStation

AxialMagInterferenceCorUsed

boolean

Was an Axial Magnetic Interference (AMI) correction applied to the azimuth value?

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

Most of the BHAs used to drill wells include an MWD tool. An MWD is a magnetic survey tool and as

such suffer from magnetic interferences from a wide variety of sources. Magnetic interferences can be

categorized into axial and radial type interferences.

Axial interferences are mainly the result of magnetic poles from the drill string steel components

located below and above the MWD tool. Radial interferences are numerous.

Therefore, there is a risk that magXAxialCorUsed includes both Axial and radial corrections.

Azi

PlaneAngleMeasure

Hole azimuth. Corrected to wells azimuth reference.

CalcAlgorithm

TrajStnCalcAlgorithm

The type of algorithm used in the position calculation.

CosagCorUsed

boolean

WWas a Cosag Correction applied to the azimuth values?

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

The BHA Sag Correction is the same as the Sag Correction except it includes the horizontal

misalignment (Cosag).

DipAngleUncert

PlaneAngleMeasure

Survey tool dip uncertainty.

DispEw

LengthMeasure

East-west offset, positive to the East.

This is relative to wellLocation with a North axis orientation of aziRef.

If a displacement with respect to a different point is desired then

define a localCRS and specify local coordinates in location.

DispNs

LengthMeasure

North-south offset, positive to the North.

This is relative to wellLocation with a North axis orientation of aziRef.

If a displacement with respect to a different point is desired then

define a localCRS and specify local coordinates in location.

Dls

AnglePerLengthMeasure

Dogleg severity.

DTimStn

TimeStamp

Date and time the station was measured or created.

ExtensionNameValue

ExtensionNameValue

Extensions to the schema based on a name-value construct.

GeoModelUsed

String64

Gravitational model used.

GravAccelCorUsed

boolean

Was an accelerometer alignment correction applied to survey computation?

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

GravTotalFieldReference

LinearAccelerationMeasure

Gravitational field theoretical/reference value.

GravTotalUncert

LinearAccelerationMeasure

Survey tool gravity uncertainty.

Gtf

PlaneAngleMeasure

Toolface angle (gravity).

Incl

PlaneAngleMeasure

Hole inclination, measured from vertical.

InfieldRefCorUsed

boolean

Was an In Field Referencing (IFR) correction applied to the azimuth value?

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

An IFR survey measures the strength and direction of the Earth's magnetic field over the area of interest.

By taking a geomagnetic modelled values away

from these field survey results, we are left with a local crustal correction,

which since it is assumed geological in nature, only varies over geological timescales.

For MWD survey operations, these corrections are applied in addition to the geomagnetic model

to provide accurate knowledge of the local magnetic field and hence to improve the

accuracy of MWD magnetic azimuth measurements.

InHoleRefCorUsed

boolean

Was an In Hole Referencing (IHR) correction applied to the inclination and/or azimuth values?

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

In-Hole Referencing essentially involves comparing gyro surveys to MWD surveys in a tangent

section of a well. Once a small part of a tangent section has been drilled and surveyed using an

MWD tool, then an open hole (OH) gyro is run. By comparing the Gyro surveys to the MWD

surveys a correction can be calculated for the MWD. This correction is then assumed as valid

for the rest of the tangent section allowing to have a near gyro accuracy for the whole section,

therefore reducing the ellipse of uncertainty (EOU) size.

InterpolatedInfieldRefCorUsed

boolean

Was an Interpolated In Field Referencing (IIFR) correction applied to the azimuth value?

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

Interpolated In Field Referencing measures the diurnal Earth magnetic field variations resulting from electrical

currents in the ionosphere and effects of magnetic storms hitting the Earth. It increases again the accuracy

of the magnetic azimuth measurement.

MagDipAngleReference

PlaneAngleMeasure

Magnetic dip angle theoretical/reference value.

MagDrlstrCorUsed

boolean

Was a drillstring magnetism correction applied to survey computation?

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

MagModelUsed

String64

Geomagnetic model used.

MagModelValid

String64

Current valid interval for the geomagnetic model used.

MagTotalFieldReference

MagneticFluxDensityMeasure

Geomagnetic field theoretical/reference value.

MagTotalUncert

MagneticFluxDensityMeasure

Survey tool magnetic uncertainty.

MagXAxialCorUsed

boolean

Was a magnetometer alignment correction applied to survey computation?

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

ManuallyEntered

boolean

Indicates whether the trajectory station information was manually entered by a human.

Md

MeasuredDepthCoord

Measured depth of measurement from the drill datum.

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

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

MdDelta

LengthMeasure

Delta measured depth from previous station.

MSACorUsed

boolean

Was a correction applied to the survey due to a

Multi-Station Analysis process?

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

Mtf

PlaneAngleMeasure

Toolface angle (magnetic).

RateBuild

AnglePerLengthMeasure

Build Rate, radius of curvature computation.

RateTurn

AnglePerLengthMeasure

Turn rate, radius of curvature computation.

SagCorUsed

boolean

Was a bottom hole assembly sag correction applied to the survey computation?

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

StatusTrajStation

TrajStationStatus

Status of the station.

Target

String64

A pointer to the intended target of this station.

Tvd

WellVerticalDepthCoord

Vertical depth of the measurements.

TvdDelta

LengthMeasure

Delta true vertical depth from previous station.

TypeSurveyTool

TypeSurveyTool

The type of tool used for the measurements.

TypeTrajStation

TrajStationType

Type of survey station.

uid

String64

A unique identifier for an instance of a trajectory station.

VertSect

LengthMeasure

Distance along vertical section azimuth plane.

From: TrajectoryStation.CorUsed

0..1To: StnTrajCorUsed

Association

Applies only to measured magnetic stations.

From: TrajectoryStation.Location

0..*To: AbstractWellLocation

Association

The 2D coordinates of the item.

Note that within the context of trajectory, the "original" coordinates are

inherently local coordinates as defined above.

From: TrajectoryStation.

To: TrajStnCalcAlgorithm

Dependency

From: TrajectoryStation.MatrixCov

0..1To: StnTrajMatrixCov

Association

Covariance matrix for error model.

From: TrajectoryStation.RawData

0..1To: StnTrajRawData

Association

Applies only to measured magnetic stations.

From: TrajectoryStation.

To: TrajStationType

Dependency

From: TrajectoryStation.IscwsaToolErrorModel

0..1To: ToolErrorModel

Association

From: TrajectoryStation.Valid

0..1To: StnTrajValid

Association

Applies only to measured magnetic stations.

From: TrajectoryStation.SourceStation

0..1To: RefWellboreTrajectoryStation

Association

A pointer to the trajectoryStation from which this station was derived.

The trajectoryStation may be in another wellbore.

From: TrajectoryStation.

To: TrajStationStatus

Dependency

From: TrajectoryStation.

To: TypeSurveyTool

Dependency

From: part_TrajectoryStation.

To: TrajectoryStation

Generalization

From: OpsReport.TrajectoryStation

0..*To: TrajectoryStation

Association

Survey station recorded during the report interval.

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.