Survey uncertainty is not a small correction. Over several thousand metres, the ellipsoid of uncertainty around a surveyed position can be tens of metres across, and it grows with depth, survey tool type and the quality of the corrections applied. Anti-collision analysis compares those ellipsoids rather than the calculated centre lines, which is why a well that looks fifty metres clear may fail a separation test.

Reference systems are a common source of serious error. Coordinates quoted on the wrong datum, grid convergence not applied, true and grid north confused, or vertical references mismatched between survey and well plan have all produced wells drilled in the wrong place. The arithmetic is straightforward; the discipline of applying it consistently is where failures occur.

Survey quality control is the other defence. Magnetic surveys affected by nearby casing, gyro surveys with excessive drift, stations at inconsistent intervals and tool malfunctions all distort the calculated path. Validation against independent surveys, quality control checks on raw data and clear rules for accepting or rejecting stations are essential to trust the result.

By the end of this training, participants will be able to:

• Describe survey tool types and the measurements each makes.
• Apply minimum curvature and other survey calculation methods.
• Work with geodetic datums, map projections and coordinate conversion.
• Apply grid, true and magnetic north references correctly.
• Apply magnetic interference corrections and in-field referencing.
• Describe gyroscopic survey types and manage drift and error.
• Apply survey error models and interpret uncertainty ellipsoids.
• Calculate separation factors and apply anti-collision rules.
• Perform survey quality control and validate survey data.
• Manage definitive surveys and wellbore positioning data across a field.

The course is instructor-led and calculation-based. Participants perform survey calculations and coordinate conversions by hand, build uncertainty ellipsoids and run separation factor analyses on real field data. Cases include wells drilled on wrong coordinates and near-collision incidents. Participants are encouraged to bring their own survey data for discussion.

Organisations sending participants to this training will:

• Reduce the risk of wellbore collision on congested platforms and pads.
• Ensure wells are drilled on correct coordinates and references.
• Improve survey quality control and data management.
• Meet regulatory and standards requirements for anti-collision.
• Maintain reliable wellbore position data across the field life.

Participants will:

• Be able to calculate surveys and convert coordinates correctly.
• Understand survey uncertainty and error models.
• Be able to run and interpret anti-collision analysis.
• Be able to quality control survey data and reject bad stations.
• Be able to manage definitive survey data.

• Drilling engineers
• Directional drilling and survey specialists
• Well planners
• Surveyors and positioning staff
• Rig site supervisors
• Geoscientists working with well positions

Upon successful completion of this training course, delegates will be awarded an official Certificate of Completion issued by the Petroleum Engineers Association (PEA), an ISO 9001:2015 certified training organization. The certificate carries 10 Credits and formally records the total learning hours completed.

Each certificate is signed by the Course Facilitator and the CEO of the Petroleum Engineers Association, and serves as verifiable proof of professional training that delegates can present to employers and professional bodies worldwide.