DwpD Ltd. specializes in
- Along-hole depth
- Determining requirements
- Measurement and correction
- Uncertainty
- Process, audit and training
Why bother ?
- One end of the spectrum:
- “We never have a depth problem …”
- Until “the problem” occurs:
- Then the other end of the spectrum:
- “We had no end of depth correlation problems on the recent XXX intersect P&A well”
- “The FWL’s don’t agree across the reservoir”
- “The horizons just don’t match”
- “We are not actually sure if there is a fault”
- “Maybe the depth is wrong ...”
Accuracy expectations
- How do we define expectations for along-hole depth measurement accuracy in different domains ?
Accuracy Components
- Requirements ! (no requirements = no accuracy !)
- Measurement methodology
- Calibration system
- Correction model and calculation
- Uncertainty model and calculation
Basic uncertainty relationship
- Accuracy = proportion of a result
- Uncertainty = result value
Calibration accuracy
- Measurement standards
- Calibration variables
- Environmental effects
- Measurement effects
- Shelf life
Correction calculation parameters
- Thermal expansion
- Elastic stretch
- Other corrections
...
View the entire Presentation:
Managing Along-hole Depth Measurement Uncertainty
Harold Bolt (Speaker), Depth Solutions