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Named Semantic Graph

Name
Impact of earth curvature
Goal
Convey TVD depth uncertainty
Description
When surveying with an inclinometer, the inclination angle is relative to the vertical defined by the gravitational field. But when surveying with a gyro, the inclination is relative to the initial vertical before running the gyro. (A. Brooks, SPE-116155-PA)

Statements

Subject Name Subject Category Predicate Name Object Name Object Category
Trajectory #1 DDQUD.Drilling.Trajectory belongs to Current Operation #1 DDQUD.Drilling.ActualOperation
Wellbore #1 DDQUD.Drilling.WellBore has a Trajectory #2 DDQUD.Drilling.Trajectory
Trajectory #2 DDQUD.Drilling.Trajectory is measured using Survey instrument gyro based #2 DDQUD.Drilling.SurveyInstrument
Distance log #1 DDQUD.Drilling.RealTimeSignal is estimated using Trajectory #2 DDQUD.Drilling.Trajectory
Wellbore #1 DDQUD.Drilling.WellBore has a Trajectory #1 DDQUD.Drilling.Trajectory
Trajectory #2 DDQUD.Drilling.Trajectory is extended to Bottom Hole Depth #1 DDQUD.Drilling.WellDepth
Trajectory #1 DDQUD.Drilling.Trajectory is measured using Survey instrument gravity based #1 DDQUD.Drilling.SurveyInstrument
Distance log #1 DDQUD.Drilling.RealTimeSignal is estimated using Trajectory #1 DDQUD.Drilling.Trajectory
Trajectory #1 DDQUD.Drilling.Trajectory is extended to Bottom Hole Depth #1 DDQUD.Drilling.WellDepth
Trajectory #2 DDQUD.Drilling.Trajectory belongs to Current Operation #1 DDQUD.Drilling.ActualOperation
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