
Assessment & Coaching (OPAC)
OPAC has been designed to provide Drilling Leadership assurance that key drilling personnel, from Driller through to Senior Drilling Engineer and Operations Superintendent have the knowledge required to deliver high angle wells flawlessly, every time. It has been designed by experts to allow individuals or drill team management to be confident there are no significant knowledge gaps that may lead to something being missed at the planning stage or during execution.
From our experience completing drilling problem reviews we find that most major NPT events are the result of something being missed by the planning or operations teams. Risks can be greatly reduced and performance improved by ensuring all key team members are well prepared.
OPAC is not just about testing people, it allows knowledge gaps to be identified and targeted with cost effective one on one coaching from a genuine industry expert or even a training course tailored specifically for your needs. The objective is to effectively bridge the gap in the most efficient way possible.


Gap analysis on critical operational areas
Detailed report & statistical analysis
Highlights unmitigated operational risk
Coaching session & training options
Certificate of completion with level (no pass/fail)
Pay per use or with subscription options for groups
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Individual assessment
Subscription Options
Group assessment
Assessment & coaching session
1 hour session
17 areas of ERD knowledge
3 assessments: engineering, operations or combined
Tailored to specific topics
Detailed report with results in-depth analysis
Review and one to one coaching with ERD expert

Assessment results review
Focus on development areas based on individual results
Concise “take-away” training material package
50% discount for one subsequent test
Provides one 50% discount for subsequent test

Industry leaders in ERD engineering and IADC Manual contributing authors, we are driven by continual improvement, developing and sharing the latest innovative drilling technologies.
0 of 10 questions completed Questions:
Test your knowledge of ERD with these 10 multiple choice questions. Want more? Merlin ERD offers full individual and group assessments with questions designed to identify key areas for further development. Click start to begin.
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You have reached 0 of 0 points, (0) Thank you for trying our free trial. Ready for the full assessment? Contact us now Downhole tool measurements indicate possible whirl vibration while drilling. Select the best course of action. (1 correct answer) How many heavy weight drill pipe joints should be run below the jar on an ERD bottom hole assembly when drilling an 8-1/2” hole section at 66° inclination? (1 correct answer) At what inclination is the hole hardest to clean? (1 correct answer) In the middle of the trip out of the hole, having successfully backreamed a problematic 650ft / 200m interval, what is the next step? (1 correct answer) If an individual cutting could be tracked up hole, approximately how far would it travel in the drilling fluid before falling to the low side (5,000ft / 1,520m of 12-1/4” hole with 5-1/2” Drill Pipe at 72° with 900 GPM, 120 RPM and typical rheology)? (1 correct answer) Where in the well will tortuousity or high dog legs lead to the highest surface torque when the bit is rotated at planned well TD? (1 correct answer) On an ERD well, after the 12-1/4” hole section was drilled to TD (20,000 ft / 6,000 m), a clean-up cycle of 5 x bottoms up was performed at 1,000 GPM (3,770 LPM) and 80 RPM. Shakers are clean of material. Based on the clean-up parameters used can you assume the hole is clean for safe tripping? What part of the “S-shape” well normally has the highest rate of casing wear? (1 correct answer) 9-⅝”, 43.5, L-80, VAM TOP Casing is selectively floated on a high angle well (12-1/4” HS 24,000 ft / 7,300 m MD; 15,000ft / 4,573 m TVD). 11.0 ppg / 1.32 s.g. oil based mud, 73° Inclination. Which of the risks below would be of most concern whilst running the casing? (1 correct answer) During what conditions will barite sagging be the highest? (1 correct answer)Check your ERD knowledge with this free trial assessment.
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Subscription & Group Services
OPAC could be tailored based on your individual or group requirements. Please contact our assessment coordinator via the contact form below or call to find out more.