Driller’s Way-point Depth Determination

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Calibrated and corrected drill pipe measured along-hole depth with uncertainty

Page last modified

April 11 2024

Driller’s Way-point Depth (DwpD) uses drill pipe measured depth to arrive at a calibrated and corrected along-hole depth with an associated uncertainty. This is True Along-hole (TAH) depth, an ISO measurement as opposed to the estimate that existing practices provide. DwpD allows along-hole depth measurement to be compared and verified and does away with simply tying-in to an arbitrary maxim. This improves along-hole depth measurement accuracy, improving well placement and the reliability of mapping of downhole structures and reservoir volumes.

Pros & Limitations

Uniform methodology for along-hole depth determination

Uniformly calibrated and corrected depth value

Calculated uncertainty based on measured parameters

Removes the guess work and the assumptions in depth determination

Assessment of depth data value based on measurable accuracy criterion

Verification of measurements without wasting data

Repeatable measurements

Non-intrusive activity as part of rig activity

Uses well known and existing rig and LWD measurements

Slight (very slight) adaptation to how things are currently done

Specification

Specification Title	Specification Description
Accuracy	Uncertainty defined by accuracy decisions.
Areas of Application	Well placement engineering \| Geological modelling \| Reservoir description \| Asset value determination
Capabilities	Repeatability of measurement, confirmation of measurement result and uncertainty determination.
CAPEX	Negligible impact on rig work flow.
Certifications / licences	Engineering justified depth measurement results.
Compliance	ISO measurement.
Cost	Cost limited to use of the patent (pending) process. Allows accurate depth determination using drill pipe for MWD/LWD applications.
Methodology	Logical and justified measurement and correction method.
Services	Services available to audit exiting processes and recommend on-site improvements.
Usability	Applicable from new drill through completion to recompletion and P&A Onshore/offshore, applicable in straight, crooked, deviated, S-profile and horizontal wells.