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