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Details
Named Semantic Graph
- Name
- Measurement of bit depth
- Goal
- Convey TVD uncertainty with reference to measured depth
- Description
- Bit depth is calculated by the integration of the vertical motion of the bit and drillstring. The vertical motion of the bit is a function of top drive vertical motion, block height vertical motion, change in surface hookload, and change in downhole WOB. The measured vertical motion of the top drive is affected by rig heave; the measured vertical motion of the block is affected by calibration and measurement accuracy and the top drive may be slightly bent, leading to uncertainty in block height. The integration is reset (“truthed”) on “pipe-down” using the pipe tally, which leads to jumps in measured bit depth. The integration is started with recognition of “bit on-bottom” which is remotely evaluated on surface, and is uncertain.
Statements
| Subject | Subject Category | Predicate | Object | Object Category |
|---|---|---|---|---|
| Bit on bottom uncertainty #1 | DDQUD.Drilling.Uncertainty | is estimated using | Confidence Factor #1 | DDQUD.Drilling.ConfidenceFactor |
| Truthed event #1 | DDQUD.Drilling.OperationEvent | is caused by | e-tally #1 | DDQUD.Drilling.ElectronicTally |
| Truthed event #2 | DDQUD.Drilling.OperationEvent | is caused by | Bit on bottom event #1 | DDQUD.Drilling.OperationEvent |
| MD uncertainty #1 | DDQUD.Drilling.Uncertainty | is estimated using | Confidence Factor #1 | DDQUD.Drilling.ConfidenceFactor |
| Bit Depth RT Source #1 | DDQUD.Drilling.RealTimeSignal | belongs to | Current operation #1 | DDQUD.Drilling.ActualOperation |
| Wellbore Position Uncertainty #1 | DDQUD.Drilling.Uncertainty | is estimated using | Confidence Factor #1 | DDQUD.Drilling.ConfidenceFactor |
| Wellbore #1 | DDQUD.Drilling.WellBore | has a | Survey #1 | DDQUD.Drilling.Trajectory |
| Bit Depth RT Source #1 | DDQUD.Drilling.RealTimeSignal | is reset using | Truthed event #1 | DDQUD.Drilling.OperationEvent |
| Bit on bottom event #1 | DDQUD.Drilling.OperationEvent | has a | Bit on bottom uncertainty #1 | DDQUD.Drilling.Uncertainty |
| MD uncertainty #1 | DDQUD.Drilling.Uncertainty | is estimated using | Heave compensation 1 | DDQUD.Drilling.Compensation |
| MD uncertainty #1 | DDQUD.Drilling.Uncertainty | is estimated using | Tide compensation 1 | DDQUD.Drilling.Compensation |
| Survey #1 | DDQUD.Drilling.Trajectory | has a | Wellbore Position Uncertainty #1 | DDQUD.Drilling.Uncertainty |
| Survey #1 | DDQUD.Drilling.Trajectory | is measured using | Survey Instrument #1 | DDQUD.Drilling.SurveyInstrument |
| Bit Depth RT Source #1 | DDQUD.Drilling.RealTimeSignal | is reset using | Truthed event #2 | DDQUD.Drilling.OperationEvent |
| Bit Depth RT Source #1 | DDQUD.Drilling.RealTimeSignal | has a | MD uncertainty #1 | DDQUD.Drilling.Uncertainty |
| Wellbore #1 | DDQUD.Drilling.WellBore | has a | Current operation #1 | DDQUD.Drilling.ActualOperation |
| Survey #1 | DDQUD.Drilling.Trajectory | belongs to | Current operation #1 | DDQUD.Drilling.ActualOperation |
| Wellbore #1 | DDQUD.Drilling.WellBore | has a | e-tally #1 | DDQUD.Drilling.ElectronicTally |
| Survey #1 | DDQUD.Drilling.Trajectory | is relative to | Bit Depth RT Source #1 | DDQUD.Drilling.RealTimeSignal |
Nodes
Plain english description
| Bit on bottom uncertainty #1 is of type DDQUD.Drilling.Uncertainty |
| Confidence Factor #1 is of type DDQUD.Drilling.ConfidenceFactor |
| Bit on bottom uncertainty #1 is estimated using Confidence Factor #1 |
| Truthed event #1 is of type DDQUD.Drilling.OperationEvent |
| e-tally #1 is of type DDQUD.Drilling.ElectronicTally |
| Truthed event #1 is caused by e-tally #1 |
| Truthed event #2 is of type DDQUD.Drilling.OperationEvent |
| Bit on bottom event #1 is of type DDQUD.Drilling.OperationEvent |
| Truthed event #2 is caused by Bit on bottom event #1 |
| MD uncertainty #1 is of type DDQUD.Drilling.Uncertainty |
| MD uncertainty #1 is estimated using Confidence Factor #1 |
| Bit Depth RT Source #1 is of type DDQUD.Drilling.RealTimeSignal |
| Current operation #1 is of type DDQUD.Drilling.ActualOperation |
| Bit Depth RT Source #1 belongs to Current operation #1 |
| Wellbore Position Uncertainty #1 is of type DDQUD.Drilling.Uncertainty |
| Wellbore Position Uncertainty #1 is estimated using Confidence Factor #1 |
| Wellbore #1 is of type DDQUD.Drilling.WellBore |
| Survey #1 is of type DDQUD.Drilling.Trajectory |
| Wellbore #1 has a Survey #1 |
| Bit Depth RT Source #1 is reset using Truthed event #1 |
| Bit on bottom event #1 has a Bit on bottom uncertainty #1 |
| Heave compensation 1 is of type DDQUD.Drilling.Compensation |
| MD uncertainty #1 is estimated using Heave compensation 1 |
| Tide compensation 1 is of type DDQUD.Drilling.Compensation |
| MD uncertainty #1 is estimated using Tide compensation 1 |
| Survey #1 has a Wellbore Position Uncertainty #1 |
| Survey Instrument #1 is of type DDQUD.Drilling.SurveyInstrument |
| Survey #1 is measured using Survey Instrument #1 |
| Bit Depth RT Source #1 is reset using Truthed event #2 |
| Bit Depth RT Source #1 has a MD uncertainty #1 |
| Wellbore #1 has a Current operation #1 |
| Survey #1 belongs to Current operation #1 |
| Wellbore #1 has a e-tally #1 |
| Survey #1 is relative to Bit Depth RT Source #1 |